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99 lines
4.1 KiB
C++
99 lines
4.1 KiB
C++
// Copyright 1998-2017 Epic Games, Inc. All Rights Reserved.
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/*=============================================================================
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OpenGL3.cpp: OpenGL 3.2 implementation.
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=============================================================================*/
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#include "CoreMinimal.h"
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#include "HAL/IConsoleManager.h"
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#include "OpenGLDrv.h"
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#include "OpenGLDrvPrivate.h"
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#if OPENGL_GL3
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bool FOpenGL3::bSupportsTessellation = false;
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bool FOpenGL3::bSupportsSeparateShaderObjects = false;
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GLsizei FOpenGL3::NextTextureName = OPENGL_NAME_CACHE_SIZE;
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GLuint FOpenGL3::TextureNamesCache[OPENGL_NAME_CACHE_SIZE];
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GLsizei FOpenGL3::NextBufferName= OPENGL_NAME_CACHE_SIZE;
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GLuint FOpenGL3::BufferNamesCache[OPENGL_NAME_CACHE_SIZE];
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GLsizei FOpenGL3::NextPipelineName = OPENGL_NAME_CACHE_SIZE;
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GLuint FOpenGL3::PipelineNamesCache[OPENGL_NAME_CACHE_SIZE];
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GLint FOpenGL3::TimestampQueryBits = 0;
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bool FOpenGL3::bDebugContext = false;
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void FOpenGL3::ProcessQueryGLInt()
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{
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GET_GL_INT(GL_MAX_VERTEX_UNIFORM_COMPONENTS, 0, MaxVertexUniformComponents);
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GET_GL_INT(GL_MAX_FRAGMENT_UNIFORM_COMPONENTS, 0, MaxPixelUniformComponents);
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GET_GL_INT(GL_MAX_GEOMETRY_UNIFORM_COMPONENTS, 0, MaxGeometryUniformComponents);
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GET_GL_INT(GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS, 0, MaxGeometryTextureImageUnits);
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if (bSupportsTessellation)
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{
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GET_GL_INT(GL_MAX_TESS_CONTROL_UNIFORM_COMPONENTS, 0, MaxHullUniformComponents);
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GET_GL_INT(GL_MAX_TESS_EVALUATION_UNIFORM_COMPONENTS, 0, MaxDomainUniformComponents);
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}
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#if !defined(__GNUC__) && !defined(__clang__)
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#define LOG_AND_GET_GL_QUERY_INT(IntEnum, Default, Dest) do { if (IntEnum) {glGetQueryiv(IntEnum, GL_QUERY_COUNTER_BITS, &Dest);} else {Dest = Default;} /*FPlatformMisc::LowLevelOutputDebugStringf(TEXT(" GL_QUERY_COUNTER_BITS: ") ## TEXT(#IntEnum) ## TEXT(": %d"), Dest);*/ } while(0)
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#else
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#define LOG_AND_GET_GL_QUERY_INT(IntEnum, Default, Dest) do { if (IntEnum) {glGetQueryiv(IntEnum, GL_QUERY_COUNTER_BITS, &Dest);} else {Dest = Default;} /*FPlatformMisc::LowLevelOutputDebugStringf(TEXT(" GL_QUERY_COUNTER_BITS: " #IntEnum ": %d"), Dest);*/ } while(0)
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#endif
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LOG_AND_GET_GL_QUERY_INT(GL_TIMESTAMP, 0, TimestampQueryBits);
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#undef LOG_AND_GET_GL_QUERY_INT
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MaxHullTextureImageUnits = 0;
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}
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void FOpenGL3::ProcessExtensions( const FString& ExtensionsString )
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{
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int32 MajorVersion = 0;
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int32 MinorVersion = 0;
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FString Version = ANSI_TO_TCHAR((const ANSICHAR*)glGetString(GL_VERSION));
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FString MajorString, MinorString;
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if (Version.Split(TEXT("."), &MajorString, &MinorString))
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{
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MajorVersion = FCString::Atoi(*MajorString);
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MinorVersion = FCString::Atoi(*MinorString);
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}
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check(MajorVersion!=0);
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// 3.3+ may expose this as an extension, 4.0+ should have this.
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// https://www.opengl.org/registry/specs/ARB/tessellation_shader.txt
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bSupportsTessellation = ExtensionsString.Contains(TEXT("GL_ARB_tessellation_shader")) || ((MajorVersion >= 4));
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ProcessQueryGLInt();
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FOpenGLBase::ProcessExtensions(ExtensionsString);
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// Test whether the GPU can support volume-texture rendering.
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// There is no API to query this - you just have to test whether a 3D texture is framebuffer-complete.
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{
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GLuint FrameBuffer;
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glGenFramebuffers(1, &FrameBuffer);
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, FrameBuffer);
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GLuint VolumeTexture;
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glGenTextures(1, &VolumeTexture);
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glBindTexture(GL_TEXTURE_3D, VolumeTexture);
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glTexImage3D(GL_TEXTURE_3D, 0, GL_RGBA8, 256, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
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glFramebufferTexture(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, VolumeTexture, 0);
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bSupportsVolumeTextureRendering = (glCheckFramebufferStatus(GL_DRAW_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE);
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glDeleteTextures(1, &VolumeTexture);
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glDeleteFramebuffers(1, &FrameBuffer);
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}
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static const auto CVar = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("OpenGL.UseSeparateShaderObjects"));
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bool const bUseSeparateShaderObjects = (CVar ? (CVar->GetValueOnRenderThread() == 1) : false) && OpenGLShaderPlatformSeparable(GetShaderPlatform());
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bSupportsSeparateShaderObjects = bUseSeparateShaderObjects && (ExtensionsString.Contains(TEXT("GL_ARB_separate_shader_objects")) || (MajorVersion == 4 && MinorVersion >= 4));
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}
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#endif
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