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Implement vertex shader depth rounding in DX9

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This commit is contained in:
Henrik Rydgard
2015-08-26 16:07:40 +02:00
parent c91b58ac8e
commit 44ce0c8dee
3 changed files with 28 additions and 4 deletions
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GPU/Directx9/GPU_DX9.cpp
+1 -1
View File
@@ -889,7 +889,7 @@ void DIRECTX9_GPU::Execute_ViewportType(u32 op, u32 diff) {
switch (op >> 24) {
case GE_CMD_VIEWPORTZ1:
case GE_CMD_VIEWPORTZ2:
shaderManager_->DirtyUniform(DIRTY_PROJMATRIX);
shaderManager_->DirtyUniform(DIRTY_PROJMATRIX | DIRTY_DEPTHRANGE);
break;
}
}
GPU/Directx9/ShaderManagerDX9.h
+2
View File
@@ -57,6 +57,8 @@ enum {
DIRTY_UVSCALEOFFSET = (1 << 18), // this will be dirtied ALL THE TIME... maybe we'll need to do "last value with this shader compares"
DIRTY_TEXCLAMP = (1 << 19),
DIRTY_DEPTHRANGE = (1 << 20),
DIRTY_WORLDMATRIX = (1 << 21),
DIRTY_VIEWMATRIX = (1 << 22), // Maybe we'll fold this into projmatrix eventually
DIRTY_TEXMATRIX = (1 << 23),
GPU/Directx9/VertexShaderGeneratorDX9.cpp
+25 -3
View File
@@ -226,6 +226,11 @@ void GenerateVertexShaderDX9(int prim, char *buffer, bool useHWTransform) {
}
}
if (!gstate.isModeThrough()) {
WRITE(p, "float4 u_depthRange;\n");
}
// And the "varyings".
if (useHWTransform) {
WRITE(p, "struct VS_IN { \n");
if (vertTypeIsSkinningEnabled(vertType)) {
@@ -279,6 +284,23 @@ void GenerateVertexShaderDX9(int prim, char *buffer, bool useHWTransform) {
}
WRITE(p, "};\n");
// See comment above this function in the OpenGL vertex shader generator (GenerateVertexShader).
WRITE(p, "\nfloat4 depthRoundZ(float4 v) {\n");
WRITE(p, " return float4(v.x, v.y, (1.0/65535.0) * floor(v.z * 65535.0), v.w);\n");
WRITE(p, "}\n\n");
if (!gstate.isModeThrough()) {
// Apply the projection and viewport to get the Z buffer value, floor to integer, undo the viewport and projection.
// Not completely sure this is 100% right under DX9 as the Z range is different...
WRITE(p, "\nfloat4 depthRoundZVP(float4 v) {\n");
WRITE(p, " float z = v.z / v.w;\n");
WRITE(p, " z = z * u_depthRange.x + u_depthRange.y;\n");
WRITE(p, " z = floor(z);\n");
WRITE(p, " z = (z - u_depthRange.y) / u_depthRange.x;\n");
WRITE(p, " return float4(v.x, v.y, z * v.w, v.w);\n");
WRITE(p, "}\n\n");
}
WRITE(p, "VS_OUT main(VS_IN In) {\n");
WRITE(p, " VS_OUT Out = (VS_OUT)0; \n");
if (!useHWTransform) {
@@ -307,9 +329,9 @@ void GenerateVertexShaderDX9(int prim, char *buffer, bool useHWTransform) {
WRITE(p, " Out.v_fogdepth.x = In.position.w;\n");
}
if (gstate.isModeThrough()) {
WRITE(p, " Out.gl_Position = mul(float4(In.position.xyz, 1.0), u_proj_through);\n");
WRITE(p, " Out.gl_Position = depthRoundZ(mul(float4(In.position.xyz, 1.0), u_proj_through));\n");
} else {
WRITE(p, " Out.gl_Position = mul(float4(In.position.xyz, 1.0), u_proj);\n");
WRITE(p, " Out.gl_Position = depthRoundZVP(mul(float4(In.position.xyz, 1.0), u_proj));\n");
}
} else {
// Step 1: World Transform / Skinning
@@ -398,7 +420,7 @@ void GenerateVertexShaderDX9(int prim, char *buffer, bool useHWTransform) {
WRITE(p, " float4 viewPos = float4(mul(float4(worldpos, 1.0), u_view), 1.0);\n");
// Final view and projection transforms.
WRITE(p, " Out.gl_Position = mul(viewPos, u_proj);\n");
WRITE(p, " Out.gl_Position = depthRoundZVP(mul(viewPos, u_proj));\n");
// TODO: Declare variables for dots for shade mapping if needed.