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gecko/dom/canvas/WebGLContextValidate.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "WebGLContext.h"
#include <algorithm>
#include "angle/ShaderLang.h"
#include "CanvasUtils.h"
#include "GLContext.h"
#include "jsfriendapi.h"
#include "mozilla/CheckedInt.h"
#include "mozilla/Preferences.h"
#include "mozilla/Services.h"
#include "nsIObserverService.h"
#include "WebGLBuffer.h"
#include "WebGLContextUtils.h"
#include "WebGLFramebuffer.h"
#include "WebGLProgram.h"
#include "WebGLRenderbuffer.h"
#include "WebGLShader.h"
#include "WebGLTexture.h"
#include "WebGLUniformLocation.h"
#include "WebGLVertexArray.h"
#include "WebGLVertexAttribData.h"
#if defined(MOZ_WIDGET_COCOA)
#include "nsCocoaFeatures.h"
#endif
using namespace mozilla;
/**
* Return the block size for format.
*/
static void
BlockSizeFor(GLenum format, GLint* blockWidth, GLint* blockHeight)
{
MOZ_ASSERT(blockWidth && blockHeight);
switch (format) {
case LOCAL_GL_ATC_RGB:
case LOCAL_GL_ATC_RGBA_EXPLICIT_ALPHA:
case LOCAL_GL_ATC_RGBA_INTERPOLATED_ALPHA:
case LOCAL_GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
case LOCAL_GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
case LOCAL_GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
case LOCAL_GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
if (blockWidth)
*blockWidth = 4;
if (blockHeight)
*blockHeight = 4;
break;
case LOCAL_GL_ETC1_RGB8_OES:
// 4x4 blocks, but no 4-multiple requirement.
default:
break;
}
}
static bool
IsCompressedFunc(WebGLTexImageFunc func)
{
return func == WebGLTexImageFunc::CompTexImage ||
func == WebGLTexImageFunc::CompTexSubImage;
}
/**
* Same as ErrorInvalidEnum but uses WebGLContext::EnumName to print displayable
* name for \a glenum.
*/
static void
ErrorInvalidEnumWithName(WebGLContext* ctx, const char* msg, GLenum glenum, WebGLTexImageFunc func, WebGLTexDimensions dims)
{
const char* name = WebGLContext::EnumName(glenum);
if (name)
ctx->ErrorInvalidEnum("%s: %s %s", InfoFrom(func, dims), msg, name);
else
ctx->ErrorInvalidEnum("%s: %s 0x%04X", InfoFrom(func, dims), msg, glenum);
}
/**
* Return true if the format is valid for source calls.
*/
static bool
IsAllowedFromSource(GLenum format, WebGLTexImageFunc func)
{
switch (format) {
case LOCAL_GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
case LOCAL_GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
case LOCAL_GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
case LOCAL_GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
case LOCAL_GL_COMPRESSED_RGB_PVRTC_2BPPV1:
case LOCAL_GL_COMPRESSED_RGB_PVRTC_4BPPV1:
case LOCAL_GL_COMPRESSED_RGBA_PVRTC_2BPPV1:
case LOCAL_GL_COMPRESSED_RGBA_PVRTC_4BPPV1:
return (func == WebGLTexImageFunc::CompTexImage ||
func == WebGLTexImageFunc::CompTexSubImage);
case LOCAL_GL_ATC_RGB:
case LOCAL_GL_ATC_RGBA_EXPLICIT_ALPHA:
case LOCAL_GL_ATC_RGBA_INTERPOLATED_ALPHA:
case LOCAL_GL_ETC1_RGB8_OES:
return func == WebGLTexImageFunc::CompTexImage;
}
return true;
}
/**
* Returns true if func is a CopyTexImage variant.
*/
static bool
IsCopyFunc(WebGLTexImageFunc func)
{
return (func == WebGLTexImageFunc::CopyTexImage ||
func == WebGLTexImageFunc::CopyTexSubImage);
}
/**
* Returns true if func is a SubImage variant.
*/
static bool
IsSubFunc(WebGLTexImageFunc func)
{
return (func == WebGLTexImageFunc::TexSubImage ||
func == WebGLTexImageFunc::CopyTexSubImage ||
func == WebGLTexImageFunc::CompTexSubImage);
}
/**
* returns true is target is a texture cube map target.
*/
static bool
IsTexImageCubemapTarget(GLenum texImageTarget)
{
return (texImageTarget >= LOCAL_GL_TEXTURE_CUBE_MAP_POSITIVE_X &&
texImageTarget <= LOCAL_GL_TEXTURE_CUBE_MAP_NEGATIVE_Z);
}
bool WebGLContext::ValidateBlendEquationEnum(GLenum mode, const char *info)
{
switch (mode) {
case LOCAL_GL_FUNC_ADD:
case LOCAL_GL_FUNC_SUBTRACT:
case LOCAL_GL_FUNC_REVERSE_SUBTRACT:
return true;
case LOCAL_GL_MIN:
case LOCAL_GL_MAX:
if (IsExtensionEnabled(WebGLExtensionID::EXT_blend_minmax)) {
return true;
}
break;
default:
break;
}
ErrorInvalidEnumInfo(info, mode);
return false;
}
bool WebGLContext::ValidateBlendFuncDstEnum(GLenum factor, const char *info)
{
switch (factor) {
case LOCAL_GL_ZERO:
case LOCAL_GL_ONE:
case LOCAL_GL_SRC_COLOR:
case LOCAL_GL_ONE_MINUS_SRC_COLOR:
case LOCAL_GL_DST_COLOR:
case LOCAL_GL_ONE_MINUS_DST_COLOR:
case LOCAL_GL_SRC_ALPHA:
case LOCAL_GL_ONE_MINUS_SRC_ALPHA:
case LOCAL_GL_DST_ALPHA:
case LOCAL_GL_ONE_MINUS_DST_ALPHA:
case LOCAL_GL_CONSTANT_COLOR:
case LOCAL_GL_ONE_MINUS_CONSTANT_COLOR:
case LOCAL_GL_CONSTANT_ALPHA:
case LOCAL_GL_ONE_MINUS_CONSTANT_ALPHA:
return true;
default:
ErrorInvalidEnumInfo(info, factor);
return false;
}
}
bool WebGLContext::ValidateBlendFuncSrcEnum(GLenum factor, const char *info)
{
if (factor == LOCAL_GL_SRC_ALPHA_SATURATE)
return true;
else
return ValidateBlendFuncDstEnum(factor, info);
}
bool WebGLContext::ValidateBlendFuncEnumsCompatibility(GLenum sfactor, GLenum dfactor, const char *info)
{
bool sfactorIsConstantColor = sfactor == LOCAL_GL_CONSTANT_COLOR ||
sfactor == LOCAL_GL_ONE_MINUS_CONSTANT_COLOR;
bool sfactorIsConstantAlpha = sfactor == LOCAL_GL_CONSTANT_ALPHA ||
sfactor == LOCAL_GL_ONE_MINUS_CONSTANT_ALPHA;
bool dfactorIsConstantColor = dfactor == LOCAL_GL_CONSTANT_COLOR ||
dfactor == LOCAL_GL_ONE_MINUS_CONSTANT_COLOR;
bool dfactorIsConstantAlpha = dfactor == LOCAL_GL_CONSTANT_ALPHA ||
dfactor == LOCAL_GL_ONE_MINUS_CONSTANT_ALPHA;
if ( (sfactorIsConstantColor && dfactorIsConstantAlpha) ||
(dfactorIsConstantColor && sfactorIsConstantAlpha) ) {
ErrorInvalidOperation("%s are mutually incompatible, see section 6.8 in the WebGL 1.0 spec", info);
return false;
} else {
return true;
}
}
bool WebGLContext::ValidateTextureTargetEnum(GLenum target, const char *info)
{
switch (target) {
case LOCAL_GL_TEXTURE_2D:
case LOCAL_GL_TEXTURE_CUBE_MAP:
return true;
case LOCAL_GL_TEXTURE_3D: {
const bool isValid = IsWebGL2();
if (!isValid) {
ErrorInvalidEnumInfo(info, target);
}
return isValid;
}
default:
ErrorInvalidEnumInfo(info, target);
return false;
}
}
bool WebGLContext::ValidateComparisonEnum(GLenum target, const char *info)
{
switch (target) {
case LOCAL_GL_NEVER:
case LOCAL_GL_LESS:
case LOCAL_GL_LEQUAL:
case LOCAL_GL_GREATER:
case LOCAL_GL_GEQUAL:
case LOCAL_GL_EQUAL:
case LOCAL_GL_NOTEQUAL:
case LOCAL_GL_ALWAYS:
return true;
default:
ErrorInvalidEnumInfo(info, target);
return false;
}
}
bool WebGLContext::ValidateStencilOpEnum(GLenum action, const char *info)
{
switch (action) {
case LOCAL_GL_KEEP:
case LOCAL_GL_ZERO:
case LOCAL_GL_REPLACE:
case LOCAL_GL_INCR:
case LOCAL_GL_INCR_WRAP:
case LOCAL_GL_DECR:
case LOCAL_GL_DECR_WRAP:
case LOCAL_GL_INVERT:
return true;
default:
ErrorInvalidEnumInfo(info, action);
return false;
}
}
bool WebGLContext::ValidateFaceEnum(GLenum face, const char *info)
{
switch (face) {
case LOCAL_GL_FRONT:
case LOCAL_GL_BACK:
case LOCAL_GL_FRONT_AND_BACK:
return true;
default:
ErrorInvalidEnumInfo(info, face);
return false;
}
}
bool WebGLContext::ValidateDrawModeEnum(GLenum mode, const char *info)
{
switch (mode) {
case LOCAL_GL_TRIANGLES:
case LOCAL_GL_TRIANGLE_STRIP:
case LOCAL_GL_TRIANGLE_FAN:
case LOCAL_GL_POINTS:
case LOCAL_GL_LINE_STRIP:
case LOCAL_GL_LINE_LOOP:
case LOCAL_GL_LINES:
return true;
default:
ErrorInvalidEnumInfo(info, mode);
return false;
}
}
bool WebGLContext::ValidateGLSLVariableName(const nsAString& name, const char *info)
{
if (name.IsEmpty())
return false;
const uint32_t maxSize = 256;
if (name.Length() > maxSize) {
ErrorInvalidValue("%s: identifier is %d characters long, exceeds the maximum allowed length of %d characters",
info, name.Length(), maxSize);
return false;
}
if (!ValidateGLSLString(name, info)) {
return false;
}
nsString prefix1 = NS_LITERAL_STRING("webgl_");
nsString prefix2 = NS_LITERAL_STRING("_webgl_");
if (Substring(name, 0, prefix1.Length()).Equals(prefix1) ||
Substring(name, 0, prefix2.Length()).Equals(prefix2))
{
ErrorInvalidOperation("%s: string contains a reserved GLSL prefix", info);
return false;
}
return true;
}
bool WebGLContext::ValidateGLSLString(const nsAString& string, const char *info)
{
for (uint32_t i = 0; i < string.Length(); ++i) {
if (!ValidateGLSLCharacter(string.CharAt(i))) {
ErrorInvalidValue("%s: string contains the illegal character '%d'", info, string.CharAt(i));
return false;
}
}
return true;
}
/**
* Return true if the framebuffer attachment is valid. Attachment must
* be one of depth/stencil/depth_stencil/color attachment.
*/
bool
WebGLContext::ValidateFramebufferAttachment(GLenum attachment, const char* funcName)
{
if (!mBoundFramebuffer) {
switch (attachment) {
case LOCAL_GL_COLOR:
case LOCAL_GL_DEPTH:
case LOCAL_GL_STENCIL:
return true;
default:
ErrorInvalidEnum("%s: attachment: invalid enum value 0x%x.", funcName, attachment);
return false;
}
}
if (attachment == LOCAL_GL_DEPTH_ATTACHMENT ||
attachment == LOCAL_GL_STENCIL_ATTACHMENT ||
attachment == LOCAL_GL_DEPTH_STENCIL_ATTACHMENT)
{
return true;
}
GLenum colorAttachCount = 1;
if (IsExtensionEnabled(WebGLExtensionID::WEBGL_draw_buffers))
colorAttachCount = mGLMaxColorAttachments;
if (attachment >= LOCAL_GL_COLOR_ATTACHMENT0 &&
attachment < GLenum(LOCAL_GL_COLOR_ATTACHMENT0 + colorAttachCount))
{
return true;
}
ErrorInvalidEnum("%s: attachment: invalid enum value 0x%x.", funcName, attachment);
return false;
}
/**
* Return true if pname is valid for GetSamplerParameter calls.
*/
bool
WebGLContext::ValidateSamplerParameterName(GLenum pname, const char* info)
{
switch (pname) {
case LOCAL_GL_TEXTURE_MIN_FILTER:
case LOCAL_GL_TEXTURE_MAG_FILTER:
case LOCAL_GL_TEXTURE_WRAP_S:
case LOCAL_GL_TEXTURE_WRAP_T:
case LOCAL_GL_TEXTURE_WRAP_R:
case LOCAL_GL_TEXTURE_MIN_LOD:
case LOCAL_GL_TEXTURE_MAX_LOD:
case LOCAL_GL_TEXTURE_COMPARE_MODE:
case LOCAL_GL_TEXTURE_COMPARE_FUNC:
return true;
default:
ErrorInvalidEnum("%s: invalid pname: %s", info, EnumName(pname));
return false;
}
}
/**
* Return true if pname and param are valid combination for SamplerParameter calls.
*/
bool
WebGLContext::ValidateSamplerParameterParams(GLenum pname, const WebGLIntOrFloat& param, const char* info)
{
const GLenum p = param.AsInt();
switch (pname) {
case LOCAL_GL_TEXTURE_MIN_FILTER:
switch (p) {
case LOCAL_GL_NEAREST:
case LOCAL_GL_LINEAR:
case LOCAL_GL_NEAREST_MIPMAP_NEAREST:
case LOCAL_GL_NEAREST_MIPMAP_LINEAR:
case LOCAL_GL_LINEAR_MIPMAP_NEAREST:
case LOCAL_GL_LINEAR_MIPMAP_LINEAR:
return true;
default:
ErrorInvalidEnum("%s: invalid param: %s", info, EnumName(p));
return false;
}
case LOCAL_GL_TEXTURE_MAG_FILTER:
switch (p) {
case LOCAL_GL_NEAREST:
case LOCAL_GL_LINEAR:
return true;
default:
ErrorInvalidEnum("%s: invalid param: %s", info, EnumName(p));
return false;
}
case LOCAL_GL_TEXTURE_WRAP_S:
case LOCAL_GL_TEXTURE_WRAP_T:
case LOCAL_GL_TEXTURE_WRAP_R:
switch (p) {
case LOCAL_GL_CLAMP_TO_EDGE:
case LOCAL_GL_REPEAT:
case LOCAL_GL_MIRRORED_REPEAT:
return true;
default:
ErrorInvalidEnum("%s: invalid param: %s", info, EnumName(p));
return false;
}
case LOCAL_GL_TEXTURE_MIN_LOD:
case LOCAL_GL_TEXTURE_MAX_LOD:
return true;
case LOCAL_GL_TEXTURE_COMPARE_MODE:
switch (param.AsInt()) {
case LOCAL_GL_NONE:
case LOCAL_GL_COMPARE_REF_TO_TEXTURE:
return true;
default:
ErrorInvalidEnum("%s: invalid param: %s", info, EnumName(p));
return false;
}
case LOCAL_GL_TEXTURE_COMPARE_FUNC:
switch (p) {
case LOCAL_GL_LEQUAL:
case LOCAL_GL_GEQUAL:
case LOCAL_GL_LESS:
case LOCAL_GL_GREATER:
case LOCAL_GL_EQUAL:
case LOCAL_GL_NOTEQUAL:
case LOCAL_GL_ALWAYS:
case LOCAL_GL_NEVER:
return true;
default:
ErrorInvalidEnum("%s: invalid param: %s", info, EnumName(p));
return false;
}
default:
ErrorInvalidEnum("%s: invalid pname: %s", info, EnumName(pname));
return false;
}
}
/**
* Return true if format is a valid texture image format for source,
* taking into account enabled WebGL extensions.
*/
bool
WebGLContext::ValidateTexImageFormat(GLenum format, WebGLTexImageFunc func, WebGLTexDimensions dims)
{
/* Core WebGL texture formats */
if (format == LOCAL_GL_ALPHA ||
format == LOCAL_GL_RGB ||
format == LOCAL_GL_RGBA ||
format == LOCAL_GL_LUMINANCE ||
format == LOCAL_GL_LUMINANCE_ALPHA)
{
return true;
}
/* WebGL2 new formats */
if (format == LOCAL_GL_RED ||
format == LOCAL_GL_RG ||
format == LOCAL_GL_RED_INTEGER ||
format == LOCAL_GL_RG_INTEGER ||
format == LOCAL_GL_RGB_INTEGER ||
format == LOCAL_GL_RGBA_INTEGER)
{
bool valid = IsWebGL2();
if (!valid) {
ErrorInvalidEnum("%s: invalid format %s: requires WebGL version 2.0 or newer",
InfoFrom(func, dims), EnumName(format));
}
return valid;
}
/* WEBGL_depth_texture added formats */
if (format == LOCAL_GL_DEPTH_COMPONENT ||
format == LOCAL_GL_DEPTH_STENCIL)
{
if (!IsExtensionEnabled(WebGLExtensionID::WEBGL_depth_texture)) {
ErrorInvalidEnum("%s: invalid format %s: need WEBGL_depth_texture enabled",
InfoFrom(func, dims), EnumName(format));
return false;
}
// If WEBGL_depth_texture is enabled, then it is not allowed to be used with the
// copyTexImage, or copyTexSubImage methods, and it is not allowed with
// texSubImage in WebGL1.
if ((func == WebGLTexImageFunc::TexSubImage && !IsWebGL2()) ||
func == WebGLTexImageFunc::CopyTexImage ||
func == WebGLTexImageFunc::CopyTexSubImage)
{
ErrorInvalidOperation("%s: format %s is not supported", InfoFrom(func, dims), EnumName(format));
return false;
}
return true;
}
// Needs to be below the depth_texture check because an invalid operation
// error needs to be generated instead of invalid enum.
/* Only core formats are valid for CopyTex(Sub)?Image */
// TODO: Revisit this once color_buffer_(half_)?float lands
if (IsCopyFunc(func)) {
ErrorInvalidEnumWithName(this, "invalid format", format, func, dims);
return false;
}
/* EXT_sRGB added formats */
if (format == LOCAL_GL_SRGB ||
format == LOCAL_GL_SRGB_ALPHA)
{
bool validFormat = IsExtensionEnabled(WebGLExtensionID::EXT_sRGB);
if (!validFormat)
ErrorInvalidEnum("%s: invalid format %s: need EXT_sRGB enabled",
InfoFrom(func, dims), WebGLContext::EnumName(format));
return validFormat;
}
ErrorInvalidEnumWithName(this, "invalid format", format, func, dims);
return false;
}
/**
* Check if the given texture target is valid for TexImage.
*/
bool
WebGLContext::ValidateTexImageTarget(GLenum target,
WebGLTexImageFunc func, WebGLTexDimensions dims)
{
switch (dims) {
case WebGLTexDimensions::Tex2D:
if (target == LOCAL_GL_TEXTURE_2D ||
IsTexImageCubemapTarget(target))
{
return true;
}
ErrorInvalidEnumWithName(this, "invalid target", target, func, dims);
return false;
case WebGLTexDimensions::Tex3D:
if (target == LOCAL_GL_TEXTURE_3D)
{
return true;
}
ErrorInvalidEnumWithName(this, "invalid target", target, func, dims);
return false;
default:
MOZ_ASSERT(false, "ValidateTexImageTarget: Invalid dims");
}
return false;
}
/**
* Return true if type is a valid texture image type for source,
* taking into account enabled WebGL extensions.
*/
bool
WebGLContext::ValidateTexImageType(GLenum type,
WebGLTexImageFunc func,
WebGLTexDimensions dims)
{
/* Core WebGL texture types */
if (type == LOCAL_GL_UNSIGNED_BYTE ||
type == LOCAL_GL_UNSIGNED_SHORT_5_6_5 ||
type == LOCAL_GL_UNSIGNED_SHORT_4_4_4_4 ||
type == LOCAL_GL_UNSIGNED_SHORT_5_5_5_1)
{
return true;
}
/* WebGL2 new types */
if (type == LOCAL_GL_BYTE ||
type == LOCAL_GL_SHORT ||
type == LOCAL_GL_INT ||
type == LOCAL_GL_FLOAT_32_UNSIGNED_INT_24_8_REV ||
type == LOCAL_GL_UNSIGNED_INT_2_10_10_10_REV ||
type == LOCAL_GL_UNSIGNED_INT_10F_11F_11F_REV ||
type == LOCAL_GL_UNSIGNED_INT_5_9_9_9_REV)
{
bool validType = IsWebGL2();
if (!validType) {
ErrorInvalidEnum("%s: invalid type %s: requires WebGL version 2.0 or newer",
InfoFrom(func, dims), WebGLContext::EnumName(type));
}
return validType;
}
/* OES_texture_float added types */
if (type == LOCAL_GL_FLOAT) {
bool validType = IsExtensionEnabled(WebGLExtensionID::OES_texture_float);
if (!validType)
ErrorInvalidEnum("%s: invalid type %s: need OES_texture_float enabled",
InfoFrom(func, dims), WebGLContext::EnumName(type));
return validType;
}
/* OES_texture_half_float add types */
if (type == LOCAL_GL_HALF_FLOAT) {
bool validType = IsExtensionEnabled(WebGLExtensionID::OES_texture_half_float);
if (!validType)
ErrorInvalidEnum("%s: invalid type %s: need OES_texture_half_float enabled",
InfoFrom(func, dims), WebGLContext::EnumName(type));
return validType;
}
/* WEBGL_depth_texture added types */
if (type == LOCAL_GL_UNSIGNED_SHORT ||
type == LOCAL_GL_UNSIGNED_INT ||
type == LOCAL_GL_UNSIGNED_INT_24_8)
{
bool validType = IsExtensionEnabled(WebGLExtensionID::WEBGL_depth_texture);
if (!validType)
ErrorInvalidEnum("%s: invalid type %s: need WEBGL_depth_texture enabled",
InfoFrom(func, dims), WebGLContext::EnumName(type));
return validType;
}
ErrorInvalidEnumWithName(this, "invalid type", type, func, dims);
return false;
}
/**
* Validate texture image sizing extra constraints for
* CompressedTex(Sub)?Image.
*/
// TODO: WebGL 2
bool
WebGLContext::ValidateCompTexImageSize(GLint level,
GLenum format,
GLint xoffset, GLint yoffset,
GLsizei width, GLsizei height,
GLsizei levelWidth, GLsizei levelHeight,
WebGLTexImageFunc func,
WebGLTexDimensions dims)
{
// Negative parameters must already have been handled above
MOZ_ASSERT(xoffset >= 0 && yoffset >= 0 &&
width >= 0 && height >= 0);
if (xoffset + width > (GLint) levelWidth) {
ErrorInvalidValue("%s: xoffset + width must be <= levelWidth", InfoFrom(func, dims));
return false;
}
if (yoffset + height > (GLint) levelHeight) {
ErrorInvalidValue("%s: yoffset + height must be <= levelHeight", InfoFrom(func, dims));
return false;
}
GLint blockWidth = 1;
GLint blockHeight = 1;
BlockSizeFor(format, &blockWidth, &blockHeight);
/* If blockWidth || blockHeight != 1, then the compressed format
* had block-based constraints to be checked. (For example, PVRTC is compressed but
* isn't a block-based format)
*/
if (blockWidth != 1 || blockHeight != 1) {
/* offsets must be multiple of block size */
if (xoffset % blockWidth != 0) {
ErrorInvalidOperation("%s: xoffset must be multiple of %d",
InfoFrom(func, dims), blockWidth);
return false;
}
if (yoffset % blockHeight != 0) {
ErrorInvalidOperation("%s: yoffset must be multiple of %d",
InfoFrom(func, dims), blockHeight);
return false;
}
/* The size must be a multiple of blockWidth and blockHeight,
* or must be using offset+size that exactly hits the edge.
* Important for small mipmap levels.
*/
/* https://www.khronos.org/registry/webgl/extensions/WEBGL_compressed_texture_s3tc/
* "When level equals zero width and height must be a multiple of 4. When
* level is greater than 0 width and height must be 0, 1, 2 or a multiple of 4.
* If they are not an INVALID_OPERATION error is generated."
*/
if (level == 0) {
if (width % blockWidth != 0) {
ErrorInvalidOperation("%s: width of level 0 must be multple of %d",
InfoFrom(func, dims), blockWidth);
return false;
}
if (height % blockHeight != 0) {
ErrorInvalidOperation("%s: height of level 0 must be multipel of %d",
InfoFrom(func, dims), blockHeight);
return false;
}
}
else if (level > 0) {
if (width % blockWidth != 0 && width > 2) {
ErrorInvalidOperation("%s: width of level %d must be multiple"
" of %d or 0, 1, 2",
InfoFrom(func, dims), level, blockWidth);
return false;
}
if (height % blockHeight != 0 && height > 2) {
ErrorInvalidOperation("%s: height of level %d must be multiple"
" of %d or 0, 1, 2",
InfoFrom(func, dims), level, blockHeight);
return false;
}
}
if (IsSubFunc(func)) {
if ((xoffset % blockWidth) != 0) {
ErrorInvalidOperation("%s: xoffset must be multiple of %d",
InfoFrom(func, dims), blockWidth);
return false;
}
if (yoffset % blockHeight != 0) {
ErrorInvalidOperation("%s: yoffset must be multiple of %d",
InfoFrom(func, dims), blockHeight);
return false;
}
}
}
switch (format) {
case LOCAL_GL_COMPRESSED_RGB_PVRTC_4BPPV1:
case LOCAL_GL_COMPRESSED_RGB_PVRTC_2BPPV1:
case LOCAL_GL_COMPRESSED_RGBA_PVRTC_4BPPV1:
case LOCAL_GL_COMPRESSED_RGBA_PVRTC_2BPPV1:
if (!is_pot_assuming_nonnegative(width) ||
!is_pot_assuming_nonnegative(height))
{
ErrorInvalidValue("%s: width and height must be powers of two",
InfoFrom(func, dims));
return false;
}
}
return true;
}
/**
* Return true if the enough data is present to satisfy compressed
* texture format constraints.
*/
bool
WebGLContext::ValidateCompTexImageDataSize(GLint level, GLenum format,
GLsizei width, GLsizei height,
uint32_t byteLength,
WebGLTexImageFunc func,
WebGLTexDimensions dims)
{
// negative width and height must already have been handled above
MOZ_ASSERT(width >= 0 && height >= 0);
CheckedUint32 required_byteLength = 0;
switch (format) {
case LOCAL_GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
case LOCAL_GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
case LOCAL_GL_ATC_RGB:
case LOCAL_GL_ETC1_RGB8_OES:
{
required_byteLength = ((CheckedUint32(width) + 3) / 4) * ((CheckedUint32(height) + 3) / 4) * 8;
break;
}
case LOCAL_GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
case LOCAL_GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
case LOCAL_GL_ATC_RGBA_EXPLICIT_ALPHA:
case LOCAL_GL_ATC_RGBA_INTERPOLATED_ALPHA:
{
required_byteLength = ((CheckedUint32(width) + 3) / 4) * ((CheckedUint32(height) + 3) / 4) * 16;
break;
}
case LOCAL_GL_COMPRESSED_RGB_PVRTC_4BPPV1:
case LOCAL_GL_COMPRESSED_RGBA_PVRTC_4BPPV1:
{
required_byteLength = CheckedUint32(std::max(width, 8)) * CheckedUint32(std::max(height, 8)) / 2;
break;
}
case LOCAL_GL_COMPRESSED_RGB_PVRTC_2BPPV1:
case LOCAL_GL_COMPRESSED_RGBA_PVRTC_2BPPV1:
{
required_byteLength = CheckedUint32(std::max(width, 16)) * CheckedUint32(std::max(height, 8)) / 4;
break;
}
}
if (!required_byteLength.isValid() || required_byteLength.value() != byteLength) {
ErrorInvalidValue("%s: data size does not match dimensions", InfoFrom(func, dims));
return false;
}
return true;
}
/**
* Validate the width, height, and depth of a texture image, \return
* true is valid, false otherwise.
* Used by all the (Compressed|Copy)?Tex(Sub)?Image functions.
* Target and level must have been validated before calling.
*/
bool
WebGLContext::ValidateTexImageSize(TexImageTarget texImageTarget, GLint level,
GLint width, GLint height, GLint depth,
WebGLTexImageFunc func, WebGLTexDimensions dims)
{
MOZ_ASSERT(level >= 0, "level should already be validated");
/* Bug 966630: maxTextureSize >> level runs into "undefined"
* behaviour depending on ISA. For example, on Intel shifts
* amounts are mod 64 (in 64-bit mode on 64-bit dest) and mod 32
* otherwise. This means 16384 >> 0x10000001 == 8192 which isn't
* what would be expected. Make the required behaviour explicit by
* clamping to a shift of 31 bits if level is greater than that
* ammount. This will give 0 that if (!maxAllowedSize) is
* expecting.
*/
if (level > 31)
level = 31;
const GLuint maxTexImageSize = MaxTextureSizeForTarget(TexImageTargetToTexTarget(texImageTarget)) >> level;
const bool isCubemapTarget = IsTexImageCubemapTarget(texImageTarget.get());
const bool isSub = IsSubFunc(func);
if (!isSub && isCubemapTarget && (width != height)) {
/* GL ES Version 2.0.25 - 3.7.1 Texture Image Specification
* "When the target parameter to TexImage2D is one of the
* six cube map two-dimensional image targets, the error
* INVALID_VALUE is generated if the width and height
* parameters are not equal."
*/
ErrorInvalidValue("%s: for cube map, width must equal height", InfoFrom(func, dims));
return false;
}
if (texImageTarget == LOCAL_GL_TEXTURE_2D || isCubemapTarget)
{
/* GL ES Version 2.0.25 - 3.7.1 Texture Image Specification
* "If wt and ht are the specified image width and height,
* and if either wt or ht are less than zero, then the error
* INVALID_VALUE is generated."
*/
if (width < 0) {
ErrorInvalidValue("%s: width must be >= 0", InfoFrom(func, dims));
return false;
}
if (height < 0) {
ErrorInvalidValue("%s: height must be >= 0", InfoFrom(func, dims));
return false;
}
/* GL ES Version 2.0.25 - 3.7.1 Texture Image Specification
* "The maximum allowable width and height of a
* two-dimensional texture image must be at least 2**(k−lod)
* for image arrays of level zero through k, where k is the
* log base 2 of MAX_TEXTURE_SIZE. and lod is the
* level-of-detail of the image array. It may be zero for
* image arrays of any level-of-detail greater than k. The
* error INVALID_VALUE is generated if the specified image
* is too large to be stored under any conditions.
*/
if (width > (int) maxTexImageSize) {
ErrorInvalidValue("%s: the maximum width for level %d is %u",
InfoFrom(func, dims), level, maxTexImageSize);
return false;
}
if (height > (int) maxTexImageSize) {
ErrorInvalidValue("%s: tex maximum height for level %d is %u",
InfoFrom(func, dims), level, maxTexImageSize);
return false;
}
/* GL ES Version 2.0.25 - 3.7.1 Texture Image Specification
* "If level is greater than zero, and either width or
* height is not a power-of-two, the error INVALID_VALUE is
* generated."
*
* This restriction does not apply to GL ES Version 3.0+.
*/
if (!IsWebGL2() && level > 0) {
if (!is_pot_assuming_nonnegative(width)) {
ErrorInvalidValue("%s: level >= 0, width of %d must be a power of two.",
InfoFrom(func, dims), width);
return false;
}
if (!is_pot_assuming_nonnegative(height)) {
ErrorInvalidValue("%s: level >= 0, height of %d must be a power of two.",
InfoFrom(func, dims), height);
return false;
}
}
}
// TODO: WebGL 2
if (texImageTarget == LOCAL_GL_TEXTURE_3D) {
if (depth < 0) {
ErrorInvalidValue("%s: depth must be >= 0", InfoFrom(func, dims));
return false;
}
if (!IsWebGL2() && !is_pot_assuming_nonnegative(depth)) {
ErrorInvalidValue("%s: level >= 0, depth of %d must be a power of two.",
InfoFrom(func, dims), depth);
return false;
}
}
return true;
}
/**
* Validate texture image sizing for Tex(Sub)?Image variants.
*/
// TODO: WebGL 2. Update this to handle 3D textures.
bool
WebGLContext::ValidateTexSubImageSize(GLint xoffset, GLint yoffset, GLint /*zoffset*/,
GLsizei width, GLsizei height, GLsizei /*depth*/,
GLsizei baseWidth, GLsizei baseHeight, GLsizei /*baseDepth*/,
WebGLTexImageFunc func, WebGLTexDimensions dims)
{
/* GL ES Version 2.0.25 - 3.7.1 Texture Image Specification
* "Taking wt and ht to be the specified width and height of the
* texture array, and taking x, y, w, and h to be the xoffset,
* yoffset, width, and height argument values, any of the
* following relationships generates the error INVALID_VALUE:
* x < 0
* x + w > wt
* y < 0
* y + h > ht"
*/
if (xoffset < 0) {
ErrorInvalidValue("%s: xoffset must be >= 0", InfoFrom(func, dims));
return false;
}
if (yoffset < 0) {
ErrorInvalidValue("%s: yoffset must be >= 0", InfoFrom(func, dims));
return false;
}
if (!CanvasUtils::CheckSaneSubrectSize(xoffset, yoffset, width, height, baseWidth, baseHeight)) {
ErrorInvalidValue("%s: subtexture rectangle out-of-bounds", InfoFrom(func, dims));
return false;
}
return true;
}
/**
* Perform validation of format/type combinations for TexImage variants.
* Returns true if the format/type is a valid combination, false otherwise.
*/
bool
WebGLContext::ValidateTexImageFormatAndType(GLenum format,
GLenum type,
WebGLTexImageFunc func,
WebGLTexDimensions dims)
{
if (IsCompressedFunc(func) || IsCopyFunc(func))
{
MOZ_ASSERT(type == LOCAL_GL_NONE && format == LOCAL_GL_NONE);
return true;
}
if (!ValidateTexImageFormat(format, func, dims) ||
!ValidateTexImageType(type, func, dims))
{
return false;
}
// Here we're reinterpreting format as an unsized internalformat;
// these are the same in practice and there's no point in having the
// same code implemented twice.
TexInternalFormat effective =
EffectiveInternalFormatFromInternalFormatAndType(format, type);
bool validCombo = effective != LOCAL_GL_NONE;
if (!validCombo)
ErrorInvalidOperation("%s: invalid combination of format %s and type %s",
InfoFrom(func, dims), WebGLContext::EnumName(format), WebGLContext::EnumName(type));
return validCombo;
}
bool
WebGLContext::ValidateCompTexImageInternalFormat(GLenum format,
WebGLTexImageFunc func,
WebGLTexDimensions dims)
{
if (!IsCompressedTextureFormat(format)) {
ErrorInvalidEnum("%s: invalid compressed texture format: %s",
InfoFrom(func, dims), WebGLContext::EnumName(format));
return false;
}
/* WEBGL_compressed_texture_atc added formats */
if (format == LOCAL_GL_ATC_RGB ||
format == LOCAL_GL_ATC_RGBA_EXPLICIT_ALPHA ||
format == LOCAL_GL_ATC_RGBA_INTERPOLATED_ALPHA)
{
bool validFormat = IsExtensionEnabled(WebGLExtensionID::WEBGL_compressed_texture_atc);
if (!validFormat)
ErrorInvalidEnum("%s: invalid format %s: need WEBGL_compressed_texture_atc enabled",
InfoFrom(func, dims), WebGLContext::EnumName(format));
return validFormat;
}
// WEBGL_compressed_texture_etc1
if (format == LOCAL_GL_ETC1_RGB8_OES) {
bool validFormat = IsExtensionEnabled(WebGLExtensionID::WEBGL_compressed_texture_etc1);
if (!validFormat)
ErrorInvalidEnum("%s: invalid format %s: need WEBGL_compressed_texture_etc1 enabled",
InfoFrom(func, dims), WebGLContext::EnumName(format));
return validFormat;
}
if (format == LOCAL_GL_COMPRESSED_RGB_PVRTC_2BPPV1 ||
format == LOCAL_GL_COMPRESSED_RGB_PVRTC_4BPPV1 ||
format == LOCAL_GL_COMPRESSED_RGBA_PVRTC_2BPPV1 ||
format == LOCAL_GL_COMPRESSED_RGBA_PVRTC_4BPPV1)
{
bool validFormat = IsExtensionEnabled(WebGLExtensionID::WEBGL_compressed_texture_pvrtc);
if (!validFormat)
ErrorInvalidEnum("%s: invalid format %s: need WEBGL_compressed_texture_pvrtc enabled",
InfoFrom(func, dims), WebGLContext::EnumName(format));
return validFormat;
}
if (format == LOCAL_GL_COMPRESSED_RGB_S3TC_DXT1_EXT ||
format == LOCAL_GL_COMPRESSED_RGBA_S3TC_DXT1_EXT ||
format == LOCAL_GL_COMPRESSED_RGBA_S3TC_DXT3_EXT ||
format == LOCAL_GL_COMPRESSED_RGBA_S3TC_DXT5_EXT)
{
bool validFormat = IsExtensionEnabled(WebGLExtensionID::WEBGL_compressed_texture_s3tc);
if (!validFormat)
ErrorInvalidEnum("%s: invalid format %s: need WEBGL_compressed_texture_s3tc enabled",
InfoFrom(func, dims), WebGLContext::EnumName(format));
return validFormat;
}
return false;
}
bool
WebGLContext::ValidateCopyTexImageInternalFormat(GLenum format,
WebGLTexImageFunc func,
WebGLTexDimensions dims)
{
bool valid = format == LOCAL_GL_RGBA ||
format == LOCAL_GL_RGB ||
format == LOCAL_GL_LUMINANCE_ALPHA ||
format == LOCAL_GL_LUMINANCE ||
format == LOCAL_GL_ALPHA;
if (!valid)
{
// in CopyTexImage, the internalformat is a function parameter,
// so a bad value is an INVALID_ENUM error.
// in CopyTexSubImage, the internalformat is part of existing state,
// so this is an INVALID_OPERATION error.
GenerateWarning("%s: invalid texture internal format: %s",
InfoFrom(func, dims), WebGLContext::EnumName(format));
SynthesizeGLError(func == WebGLTexImageFunc::CopyTexImage
? LOCAL_GL_INVALID_ENUM
: LOCAL_GL_INVALID_OPERATION);
}
return valid;
}
/**
* Return true if format, type and jsArrayType are a valid combination.
* Also returns the size for texel of format and type (in bytes) via
* \a texelSize.
*
* It is assumed that type has previously been validated.
*/
bool
WebGLContext::ValidateTexInputData(GLenum type,
js::Scalar::Type jsArrayType,
WebGLTexImageFunc func,
WebGLTexDimensions dims)
{
bool validInput = false;
const char invalidTypedArray[] = "%s: invalid typed array type for given texture data type";
// We're using js::Scalar::TypeMax as dummy value when the tex source wasn't a
// typed array.
if (jsArrayType == js::Scalar::TypeMax) {
return true;
}
// First, we check for packed types
switch (type) {
case LOCAL_GL_UNSIGNED_BYTE:
validInput = jsArrayType == js::Scalar::Uint8;
break;
case LOCAL_GL_BYTE:
validInput = jsArrayType == js::Scalar::Int8;
break;
case LOCAL_GL_HALF_FLOAT:
case LOCAL_GL_UNSIGNED_SHORT:
case LOCAL_GL_UNSIGNED_SHORT_4_4_4_4:
case LOCAL_GL_UNSIGNED_SHORT_5_5_5_1:
case LOCAL_GL_UNSIGNED_SHORT_5_6_5:
validInput = jsArrayType == js::Scalar::Uint16;
break;
case LOCAL_GL_SHORT:
validInput = jsArrayType == js::Scalar::Int16;
break;
case LOCAL_GL_UNSIGNED_INT:
case LOCAL_GL_UNSIGNED_INT_24_8:
case LOCAL_GL_UNSIGNED_INT_2_10_10_10_REV:
case LOCAL_GL_UNSIGNED_INT_10F_11F_11F_REV:
case LOCAL_GL_UNSIGNED_INT_5_9_9_9_REV:
validInput = jsArrayType == js::Scalar::Uint32;
break;
case LOCAL_GL_INT:
validInput = jsArrayType == js::Scalar::Int32;
break;
case LOCAL_GL_FLOAT:
validInput = jsArrayType == js::Scalar::Float32;
break;
default:
break;
}
if (!validInput)
ErrorInvalidOperation(invalidTypedArray, InfoFrom(func, dims));
return validInput;
}
/**
* Checks specific for the CopyTex[Sub]Image2D functions.
* Verifies:
* - Framebuffer is complete and has valid read planes
* - Copy format is a subset of framebuffer format (i.e. all required components are available)
*/
bool
WebGLContext::ValidateCopyTexImage(GLenum format,
WebGLTexImageFunc func,
WebGLTexDimensions dims)
{
MOZ_ASSERT(IsCopyFunc(func));
// Default framebuffer format
GLenum fboFormat = mOptions.alpha ? LOCAL_GL_RGBA : LOCAL_GL_RGB;
if (mBoundFramebuffer) {
if (!mBoundFramebuffer->CheckAndInitializeAttachments()) {
ErrorInvalidFramebufferOperation("%s: incomplete framebuffer", InfoFrom(func, dims));
return false;
}
GLenum readPlaneBits = LOCAL_GL_COLOR_BUFFER_BIT;
if (!mBoundFramebuffer->HasCompletePlanes(readPlaneBits)) {
ErrorInvalidOperation("%s: Read source attachment doesn't have the"
" correct color/depth/stencil type.", InfoFrom(func, dims));
return false;
}
// Get the correct format for the framebuffer, as it's not the default one
const WebGLFramebuffer::Attachment& color0 = mBoundFramebuffer->GetAttachment(LOCAL_GL_COLOR_ATTACHMENT0);
fboFormat = mBoundFramebuffer->GetFormatForAttachment(color0);
}
// Make sure the format of the framebuffer is a superset of
// the format requested by the CopyTex[Sub]Image2D functions.
const GLComponents formatComps = GLComponents(format);
const GLComponents fboComps = GLComponents(fboFormat);
if (!formatComps.IsSubsetOf(fboComps)) {
ErrorInvalidOperation("%s: format %s is not a subset of the current framebuffer format, which is %s.",
InfoFrom(func, dims), EnumName(format), EnumName(fboFormat));
return false;
}
return true;
}
/**
* Test the gl(Copy|Compressed)?Tex[Sub]?Image[23]() parameters for errors.
* Verifies each of the parameters against the WebGL standard and enabled extensions.
*/
// TODO: Texture dims is here for future expansion in WebGL 2.0
bool
WebGLContext::ValidateTexImage(TexImageTarget texImageTarget,
GLint level,
GLenum internalFormat,
GLint xoffset, GLint yoffset, GLint zoffset,
GLint width, GLint height, GLint depth,
GLint border,
GLenum format,
GLenum type,
WebGLTexImageFunc func,
WebGLTexDimensions dims)
{
const char* info = InfoFrom(func, dims);
/* Check level */
if (level < 0) {
ErrorInvalidValue("%s: level must be >= 0", info);
return false;
}
/* Check border */
if (border != 0) {
ErrorInvalidValue("%s: border must be 0", info);
return false;
}
/* Check incoming image format and type */
if (!ValidateTexImageFormatAndType(format, type, func, dims))
return false;
if (!TexInternalFormat::IsValueLegal(internalFormat)) {
ErrorInvalidEnum("%s: invalid internalformat enum %s", info, EnumName(internalFormat));
return false;
}
TexInternalFormat unsizedInternalFormat =
UnsizedInternalFormatFromInternalFormat(internalFormat);
if (IsCompressedFunc(func)) {
if (!ValidateCompTexImageInternalFormat(internalFormat, func, dims)) {
return false;
}
} else if (IsCopyFunc(func)) {
if (!ValidateCopyTexImageInternalFormat(unsizedInternalFormat.get(), func, dims)) {
return false;
}
} else if (format != unsizedInternalFormat) {
if (IsWebGL2()) {
// In WebGL2, it's OK to have internalformat != format if internalformat is the sized
// internal format corresponding to the (format, type) pair according to Table 3.2
// in the OpenGL ES 3.0.3 spec.
if (internalFormat != EffectiveInternalFormatFromInternalFormatAndType(format, type)) {
bool exceptionallyAllowed = false;
if (internalFormat == LOCAL_GL_SRGB8_ALPHA8 &&
format == LOCAL_GL_RGBA &&
type == LOCAL_GL_UNSIGNED_BYTE)
{
exceptionallyAllowed = true;
}
else if (internalFormat == LOCAL_GL_SRGB8 &&
format == LOCAL_GL_RGB &&
type == LOCAL_GL_UNSIGNED_BYTE)
{
exceptionallyAllowed = true;
}
if (!exceptionallyAllowed) {
ErrorInvalidOperation("%s: internalformat does not match format and type", info);
return false;
}
}
} else {
// in WebGL 1, format must be equal to internalformat
ErrorInvalidOperation("%s: internalformat does not match format", info);
return false;
}
}
/* Check texture image size */
if (!ValidateTexImageSize(texImageTarget, level, width, height, 0, func, dims))
return false;
/* 5.14.8 Texture objects - WebGL Spec.
* "If an attempt is made to call these functions with no
* WebGLTexture bound (see above), an INVALID_OPERATION error
* is generated."
*/
WebGLTexture* tex = activeBoundTextureForTexImageTarget(texImageTarget);
if (!tex) {
ErrorInvalidOperation("%s: no texture is bound to target %s",
info, WebGLContext::EnumName(texImageTarget.get()));
return false;
}
if (IsSubFunc(func)) {
if (!tex->HasImageInfoAt(texImageTarget, level)) {
ErrorInvalidOperation("%s: no texture image previously defined for target %s at level %d",
info, WebGLContext::EnumName(texImageTarget.get()), level);
return false;
}
const WebGLTexture::ImageInfo& imageInfo = tex->ImageInfoAt(texImageTarget, level);
if (!ValidateTexSubImageSize(xoffset, yoffset, zoffset,
width, height, depth,
imageInfo.Width(), imageInfo.Height(), 0,
func, dims))
{
return false;
}
}
/* Additional checks for depth textures */
if (texImageTarget != LOCAL_GL_TEXTURE_2D &&
(format == LOCAL_GL_DEPTH_COMPONENT ||
format == LOCAL_GL_DEPTH_STENCIL))
{
ErrorInvalidOperation("%s: with format of %s target must be TEXTURE_2D",
info, WebGLContext::EnumName(format));
return false;
}
/* Additional checks for compressed textures */
if (!IsAllowedFromSource(internalFormat, func)) {
ErrorInvalidOperation("%s: Invalid format %s for this operation",
info, WebGLContext::EnumName(format));
return false;
}
/* Parameters are OK */
return true;
}
bool
WebGLContext::ValidateUniformLocation(const char* info, WebGLUniformLocation *location_object)
{
if (!ValidateObjectAllowNull(info, location_object))
return false;
if (!location_object)
return false;
/* the need to check specifically for !mCurrentProgram here is explained in bug 657556 */
if (!mCurrentProgram) {
ErrorInvalidOperation("%s: no program is currently bound", info);
return false;
}
if (mCurrentProgram != location_object->Program()) {
ErrorInvalidOperation("%s: this uniform location doesn't correspond to the current program", info);
return false;
}
if (mCurrentProgram->Generation() != location_object->ProgramGeneration()) {
ErrorInvalidOperation("%s: This uniform location is obsolete since the program has been relinked", info);
return false;
}
return true;
}
bool
WebGLContext::ValidateSamplerUniformSetter(const char* info, WebGLUniformLocation *location, GLint value)
{
if (location->Info().type != LOCAL_GL_SAMPLER_2D &&
location->Info().type != LOCAL_GL_SAMPLER_CUBE)
{
return true;
}
if (value >= 0 && value < mGLMaxTextureUnits)
return true;
ErrorInvalidValue("%s: this uniform location is a sampler, but %d is not a valid texture unit",
info, value);
return false;
}
bool
WebGLContext::ValidateAttribArraySetter(const char* name, uint32_t cnt, uint32_t arrayLength)
{
if (IsContextLost()) {
return false;
}
if (arrayLength < cnt) {
ErrorInvalidOperation("%s: array must be >= %d elements", name, cnt);
return false;
}
return true;
}
static bool
IsUniformSetterTypeValid(GLenum setterType, GLenum uniformType)
{
switch (uniformType) {
case LOCAL_GL_BOOL:
case LOCAL_GL_BOOL_VEC2:
case LOCAL_GL_BOOL_VEC3:
case LOCAL_GL_BOOL_VEC4:
return true; // GLfloat(0.0) sets a bool to false.
case LOCAL_GL_INT:
case LOCAL_GL_SAMPLER_2D:
case LOCAL_GL_SAMPLER_CUBE:
case LOCAL_GL_INT_VEC2:
case LOCAL_GL_INT_VEC3:
case LOCAL_GL_INT_VEC4:
return setterType == LOCAL_GL_INT;
case LOCAL_GL_FLOAT:
case LOCAL_GL_FLOAT_VEC2:
case LOCAL_GL_FLOAT_VEC3:
case LOCAL_GL_FLOAT_VEC4:
case LOCAL_GL_FLOAT_MAT2:
case LOCAL_GL_FLOAT_MAT3:
case LOCAL_GL_FLOAT_MAT4:
return setterType == LOCAL_GL_FLOAT;
default:
MOZ_ASSERT(false); // should never get here
return false;
}
}
static bool
CheckUniformSizeAndType(WebGLContext& webgl, WebGLUniformLocation* loc,
uint8_t setterElemSize, GLenum setterType,
const char* info)
{
if (setterElemSize != loc->ElementSize()) {
webgl.ErrorInvalidOperation("%s: Bad uniform size: %i", info,
loc->ElementSize());
return false;
}
if (!IsUniformSetterTypeValid(setterType, loc->Info().type)) {
webgl.ErrorInvalidOperation("%s: Bad uniform type: %i", info,
loc->Info().type);
return false;
}
return true;
}
static bool
CheckUniformArrayLength(WebGLContext& webgl, WebGLUniformLocation* loc,
uint8_t setterElemSize, size_t setterArraySize,
const char* info)
{
if (setterArraySize == 0 ||
setterArraySize % setterElemSize)
{
webgl.ErrorInvalidValue("%s: expected an array of length a multiple of"
" %d, got an array of length %d.", info,
setterElemSize, setterArraySize);
return false;
}
if (!loc->Info().isArray &&
setterArraySize != setterElemSize)
{
webgl.ErrorInvalidOperation("%s: expected an array of length exactly %d"
" (since this uniform is not an array"
" uniform), got an array of length %d.",
info, setterElemSize, setterArraySize);
return false;
}
return true;
}
bool
WebGLContext::ValidateUniformSetter(WebGLUniformLocation* loc,
uint8_t setterElemSize, GLenum setterType,
const char* info, GLuint* out_rawLoc)
{
if (IsContextLost())
return false;
if (!ValidateUniformLocation(info, loc))
return false;
if (!CheckUniformSizeAndType(*this, loc, setterElemSize, setterType, info))
return false;
*out_rawLoc = loc->Location();
return true;
}
bool
WebGLContext::ValidateUniformArraySetter(WebGLUniformLocation* loc,
uint8_t setterElemSize, GLenum setterType,
size_t setterArraySize,
const char* info, GLuint* out_rawLoc,
GLsizei* out_numElementsToUpload)
{
if (IsContextLost())
return false;
if (!ValidateUniformLocation(info, loc))
return false;
if (!CheckUniformSizeAndType(*this, loc, setterElemSize, setterType, info))
return false;
if (!CheckUniformArrayLength(*this, loc, setterElemSize, setterArraySize,
info))
{
return false;
}
*out_rawLoc = loc->Location();
*out_numElementsToUpload = std::min((size_t)loc->Info().arraySize,
setterArraySize / setterElemSize);
return true;
}
bool
WebGLContext::ValidateUniformMatrixArraySetter(WebGLUniformLocation* loc,
uint8_t setterDims,
GLenum setterType,
size_t setterArraySize,
bool setterTranspose,
const char* info,
GLuint* out_rawLoc,
GLsizei* out_numElementsToUpload)
{
uint8_t setterElemSize = setterDims * setterDims;
if (IsContextLost())
return false;
if (!ValidateUniformLocation(info, loc))
return false;
if (!CheckUniformSizeAndType(*this, loc, setterElemSize, setterType, info))
return false;
if (!CheckUniformArrayLength(*this, loc, setterElemSize, setterArraySize,
info))
{
return false;
}
if (setterTranspose) {
ErrorInvalidValue("%s: `transpose` must be false.", info);
return false;
}
*out_rawLoc = loc->Location();
*out_numElementsToUpload = std::min((size_t)loc->Info().arraySize,
setterArraySize / setterElemSize);
return true;
}
bool WebGLContext::ValidateStencilParamsForDrawCall()
{
const char *msg = "%s set different front and back stencil %s. Drawing in this configuration is not allowed.";
if (mStencilRefFront != mStencilRefBack) {
ErrorInvalidOperation(msg, "stencilFuncSeparate", "reference values");
return false;
}
if (mStencilValueMaskFront != mStencilValueMaskBack) {
ErrorInvalidOperation(msg, "stencilFuncSeparate", "value masks");
return false;
}
if (mStencilWriteMaskFront != mStencilWriteMaskBack) {
ErrorInvalidOperation(msg, "stencilMaskSeparate", "write masks");
return false;
}
return true;
}
static inline int32_t floorPOT(int32_t x)
{
MOZ_ASSERT(x > 0);
int32_t pot = 1;
while (pot < 0x40000000) {
if (x < pot*2)
break;
pot *= 2;
}
return pot;
}
bool
WebGLContext::InitAndValidateGL()
{
if (!gl) return false;
GLenum error = gl->fGetError();
if (error != LOCAL_GL_NO_ERROR) {
GenerateWarning("GL error 0x%x occurred during OpenGL context initialization, before WebGL initialization!", error);
return false;
}
mMinCapability = Preferences::GetBool("webgl.min_capability_mode", false);
mDisableExtensions = Preferences::GetBool("webgl.disable-extensions", false);
mLoseContextOnMemoryPressure = Preferences::GetBool("webgl.lose-context-on-memory-pressure", false);
mCanLoseContextInForeground = Preferences::GetBool("webgl.can-lose-context-in-foreground", true);
mRestoreWhenVisible = Preferences::GetBool("webgl.restore-context-when-visible", true);
if (MinCapabilityMode()) {
mDisableFragHighP = true;
}
// These are the default values, see 6.2 State tables in the
// OpenGL ES 2.0.25 spec.
mColorWriteMask[0] = 1;
mColorWriteMask[1] = 1;
mColorWriteMask[2] = 1;
mColorWriteMask[3] = 1;
mDepthWriteMask = 1;
mColorClearValue[0] = 0.f;
mColorClearValue[1] = 0.f;
mColorClearValue[2] = 0.f;
mColorClearValue[3] = 0.f;
mDepthClearValue = 1.f;
mStencilClearValue = 0;
mStencilRefFront = 0;
mStencilRefBack = 0;
/*
// Technically, we should be setting mStencil[...] values to
// `allOnes`, but either ANGLE breaks or the SGX540s on Try break.
GLuint stencilBits = 0;
gl->GetUIntegerv(LOCAL_GL_STENCIL_BITS, &stencilBits);
GLuint allOnes = ~(UINT32_MAX << stencilBits);
mStencilValueMaskFront = allOnes;
mStencilValueMaskBack = allOnes;
mStencilWriteMaskFront = allOnes;
mStencilWriteMaskBack = allOnes;
*/
gl->GetUIntegerv(LOCAL_GL_STENCIL_VALUE_MASK, &mStencilValueMaskFront);
gl->GetUIntegerv(LOCAL_GL_STENCIL_BACK_VALUE_MASK, &mStencilValueMaskBack);
gl->GetUIntegerv(LOCAL_GL_STENCIL_WRITEMASK, &mStencilWriteMaskFront);
gl->GetUIntegerv(LOCAL_GL_STENCIL_BACK_WRITEMASK, &mStencilWriteMaskBack);
AssertUintParamCorrect(gl, LOCAL_GL_STENCIL_VALUE_MASK, mStencilValueMaskFront);
AssertUintParamCorrect(gl, LOCAL_GL_STENCIL_BACK_VALUE_MASK, mStencilValueMaskBack);
AssertUintParamCorrect(gl, LOCAL_GL_STENCIL_WRITEMASK, mStencilWriteMaskFront);
AssertUintParamCorrect(gl, LOCAL_GL_STENCIL_BACK_WRITEMASK, mStencilWriteMaskBack);
mDitherEnabled = true;
mRasterizerDiscardEnabled = false;
mScissorTestEnabled = false;
// Bindings, etc.
mActiveTexture = 0;
mEmitContextLostErrorOnce = true;
mWebGLError = LOCAL_GL_NO_ERROR;
mUnderlyingGLError = LOCAL_GL_NO_ERROR;
mBound2DTextures.Clear();
mBoundCubeMapTextures.Clear();
mBound3DTextures.Clear();
mBoundArrayBuffer = nullptr;
mBoundTransformFeedbackBuffer = nullptr;
mCurrentProgram = nullptr;
mBoundFramebuffer = nullptr;
mBoundRenderbuffer = nullptr;
MakeContextCurrent();
// on desktop OpenGL, we always keep vertex attrib 0 array enabled
if (!gl->IsGLES()) {
gl->fEnableVertexAttribArray(0);
}
if (MinCapabilityMode()) {
mGLMaxVertexAttribs = MINVALUE_GL_MAX_VERTEX_ATTRIBS;
} else {
gl->fGetIntegerv(LOCAL_GL_MAX_VERTEX_ATTRIBS, &mGLMaxVertexAttribs);
}
if (mGLMaxVertexAttribs < 8) {
GenerateWarning("GL_MAX_VERTEX_ATTRIBS: %d is < 8!", mGLMaxVertexAttribs);
return false;
}
// Note: GL_MAX_TEXTURE_UNITS is fixed at 4 for most desktop hardware,
// even though the hardware supports much more. The
// GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS value is the accurate value.
if (MinCapabilityMode()) {
mGLMaxTextureUnits = MINVALUE_GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS;
} else {
gl->fGetIntegerv(LOCAL_GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &mGLMaxTextureUnits);
}
if (mGLMaxTextureUnits < 8) {
GenerateWarning("GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS: %d is < 8!", mGLMaxTextureUnits);
return false;
}
mBound2DTextures.SetLength(mGLMaxTextureUnits);
mBoundCubeMapTextures.SetLength(mGLMaxTextureUnits);
mBound3DTextures.SetLength(mGLMaxTextureUnits);
if (MinCapabilityMode()) {
mGLMaxTextureSize = MINVALUE_GL_MAX_TEXTURE_SIZE;
mGLMaxCubeMapTextureSize = MINVALUE_GL_MAX_CUBE_MAP_TEXTURE_SIZE;
mGLMaxRenderbufferSize = MINVALUE_GL_MAX_RENDERBUFFER_SIZE;
mGLMaxTextureImageUnits = MINVALUE_GL_MAX_TEXTURE_IMAGE_UNITS;
mGLMaxVertexTextureImageUnits = MINVALUE_GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS;
} else {
gl->fGetIntegerv(LOCAL_GL_MAX_TEXTURE_SIZE, &mGLMaxTextureSize);
gl->fGetIntegerv(LOCAL_GL_MAX_CUBE_MAP_TEXTURE_SIZE, &mGLMaxCubeMapTextureSize);
gl->fGetIntegerv(LOCAL_GL_MAX_RENDERBUFFER_SIZE, &mGLMaxRenderbufferSize);
gl->fGetIntegerv(LOCAL_GL_MAX_TEXTURE_IMAGE_UNITS, &mGLMaxTextureImageUnits);
gl->fGetIntegerv(LOCAL_GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, &mGLMaxVertexTextureImageUnits);
}
// Calculate log2 of mGLMaxTextureSize and mGLMaxCubeMapTextureSize
mGLMaxTextureSizeLog2 = 0;
int32_t tempSize = mGLMaxTextureSize;
while (tempSize >>= 1) {
++mGLMaxTextureSizeLog2;
}
mGLMaxCubeMapTextureSizeLog2 = 0;
tempSize = mGLMaxCubeMapTextureSize;
while (tempSize >>= 1) {
++mGLMaxCubeMapTextureSizeLog2;
}
mGLMaxTextureSize = floorPOT(mGLMaxTextureSize);
mGLMaxRenderbufferSize = floorPOT(mGLMaxRenderbufferSize);
if (MinCapabilityMode()) {
mGLMaxFragmentUniformVectors = MINVALUE_GL_MAX_FRAGMENT_UNIFORM_VECTORS;
mGLMaxVertexUniformVectors = MINVALUE_GL_MAX_VERTEX_UNIFORM_VECTORS;
mGLMaxVaryingVectors = MINVALUE_GL_MAX_VARYING_VECTORS;
} else {
if (gl->IsSupported(gl::GLFeature::ES2_compatibility)) {
gl->fGetIntegerv(LOCAL_GL_MAX_FRAGMENT_UNIFORM_VECTORS, &mGLMaxFragmentUniformVectors);
gl->fGetIntegerv(LOCAL_GL_MAX_VERTEX_UNIFORM_VECTORS, &mGLMaxVertexUniformVectors);
gl->fGetIntegerv(LOCAL_GL_MAX_VARYING_VECTORS, &mGLMaxVaryingVectors);
} else {
gl->fGetIntegerv(LOCAL_GL_MAX_FRAGMENT_UNIFORM_COMPONENTS, &mGLMaxFragmentUniformVectors);
mGLMaxFragmentUniformVectors /= 4;
gl->fGetIntegerv(LOCAL_GL_MAX_VERTEX_UNIFORM_COMPONENTS, &mGLMaxVertexUniformVectors);
mGLMaxVertexUniformVectors /= 4;
// we are now going to try to read GL_MAX_VERTEX_OUTPUT_COMPONENTS and GL_MAX_FRAGMENT_INPUT_COMPONENTS,
// however these constants only entered the OpenGL standard at OpenGL 3.2. So we will try reading,
// and check OpenGL error for INVALID_ENUM.
// On the public_webgl list, "problematic GetParameter pnames" thread, the following formula was given:
// mGLMaxVaryingVectors = min (GL_MAX_VERTEX_OUTPUT_COMPONENTS, GL_MAX_FRAGMENT_INPUT_COMPONENTS) / 4
GLint maxVertexOutputComponents = 0;
GLint maxFragmentInputComponents = 0;
const bool ok = (gl->GetPotentialInteger(LOCAL_GL_MAX_VERTEX_OUTPUT_COMPONENTS,
&maxVertexOutputComponents) &&
gl->GetPotentialInteger(LOCAL_GL_MAX_FRAGMENT_INPUT_COMPONENTS,
&maxFragmentInputComponents));
if (ok) {
mGLMaxVaryingVectors = std::min(maxVertexOutputComponents,
maxFragmentInputComponents) / 4;
} else {
mGLMaxVaryingVectors = 16;
// = 64/4, 64 is the min value for maxVertexOutputComponents in OpenGL 3.2 spec
}
}
}
// Always 1 for GLES2
mMaxFramebufferColorAttachments = 1;
if (!gl->IsGLES()) {
// gl_PointSize is always available in ES2 GLSL, but has to be
// specifically enabled on desktop GLSL.
gl->fEnable(LOCAL_GL_VERTEX_PROGRAM_POINT_SIZE);
// gl_PointCoord is always available in ES2 GLSL and in newer desktop GLSL versions, but apparently
// not in OpenGL 2 and apparently not (due to a driver bug) on certain NVIDIA setups. See:
// http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=261472
// Note that this used to cause crashes on old ATI drivers... hopefully not a significant
// problem anymore. See bug 602183.
gl->fEnable(LOCAL_GL_POINT_SPRITE);
}
#ifdef XP_MACOSX
if (gl->WorkAroundDriverBugs() &&
gl->Vendor() == gl::GLVendor::ATI &&
!nsCocoaFeatures::IsAtLeastVersion(10,9))
{
// The Mac ATI driver, in all known OSX version up to and including 10.8,
// renders points sprites upside-down. Apple bug 11778921
gl->fPointParameterf(LOCAL_GL_POINT_SPRITE_COORD_ORIGIN, LOCAL_GL_LOWER_LEFT);
}
#endif
// Check the shader validator pref
NS_ENSURE_TRUE(Preferences::GetRootBranch(), false);
mShaderValidation =
Preferences::GetBool("webgl.shader_validator", mShaderValidation);
// initialize shader translator
if (mShaderValidation) {
if (!ShInitialize()) {
GenerateWarning("GLSL translator initialization failed!");
return false;
}
}
// Mesa can only be detected with the GL_VERSION string, of the form "2.1 Mesa 7.11.0"
mIsMesa = strstr((const char *)(gl->fGetString(LOCAL_GL_VERSION)), "Mesa");
// Notice that the point of calling fGetError here is not only to check for
// errors, but also to reset the error flags so that a subsequent WebGL
// getError call will give the correct result.
error = gl->fGetError();
if (error != LOCAL_GL_NO_ERROR) {
GenerateWarning("GL error 0x%x occurred during WebGL context initialization!", error);
return false;
}
if (IsWebGL2() &&
!InitWebGL2())
{
// Todo: Bug 898404: Only allow WebGL2 on GL>=3.0 on desktop GL.
return false;
}
// Default value for all disabled vertex attributes is [0, 0, 0, 1]
for (int32_t index = 0; index < mGLMaxVertexAttribs; ++index) {
VertexAttrib4f(index, 0, 0, 0, 1);
}
mDefaultVertexArray = WebGLVertexArray::Create(this);
mDefaultVertexArray->mAttribs.SetLength(mGLMaxVertexAttribs);
mBoundVertexArray = mDefaultVertexArray;
if (mLoseContextOnMemoryPressure) {
mContextObserver->RegisterMemoryPressureEvent();
}
return true;
}
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