void DynamicHLSL::getPixelShaderOutputKey(const gl::Data &data,
const gl::Program::Data &programData,
const ProgramD3DMetadata &metadata,
std::vector<PixelShaderOutputVariable> *outPixelShaderKey)
{
// Two cases when writing to gl_FragColor and using ESSL 1.0:
// - with a 3.0 context, the output color is copied to channel 0
// - with a 2.0 context, the output color is broadcast to all channels
bool broadcast = metadata.usesBroadcast(data);
const unsigned int numRenderTargets =
(broadcast || metadata.usesMultipleFragmentOuts() ? data.caps->maxDrawBuffers : 1);
if (metadata.getMajorShaderVersion() < 300)
{
for (unsigned int renderTargetIndex = 0; renderTargetIndex < numRenderTargets;
renderTargetIndex++)
{
PixelShaderOutputVariable outputKeyVariable;
outputKeyVariable.type = GL_FLOAT_VEC4;
outputKeyVariable.name = "gl_Color" + Str(renderTargetIndex);
outputKeyVariable.source =
broadcast ? "gl_Color[0]" : "gl_Color[" + Str(renderTargetIndex) + "]";
outputKeyVariable.outputIndex = renderTargetIndex;
outPixelShaderKey->push_back(outputKeyVariable);
}
}
else
{
const auto &shaderOutputVars =
metadata.getFragmentShader()->getData().getActiveOutputVariables();
for (auto outputPair : programData.getOutputVariables())
{
const VariableLocation &outputLocation = outputPair.second;
const sh::ShaderVariable &outputVariable = shaderOutputVars[outputLocation.index];
const std::string &variableName = "out_" + outputLocation.name;
const std::string &elementString =
(outputLocation.element == GL_INVALID_INDEX ? "" : Str(outputLocation.element));
ASSERT(outputVariable.staticUse);
PixelShaderOutputVariable outputKeyVariable;
outputKeyVariable.type = outputVariable.type;
outputKeyVariable.name = variableName + elementString;
outputKeyVariable.source = variableName + ArrayString(outputLocation.element);
outputKeyVariable.outputIndex = outputPair.first;
outPixelShaderKey->push_back(outputKeyVariable);
}
}
}
void VaryingPacking::enableBuiltins(ShaderType shaderType,
const ProgramD3DMetadata &programMetadata)
{
int majorShaderModel = programMetadata.getRendererMajorShaderModel();
bool position = programMetadata.usesTransformFeedbackGLPosition();
bool fragCoord = programMetadata.usesFragCoord();
bool pointCoord = shaderType == SHADER_VERTEX ? programMetadata.addsPointCoordToVertexShader()
: programMetadata.usesPointCoord();
bool pointSize = programMetadata.usesSystemValuePointSize();
bool hlsl4 = (majorShaderModel >= 4);
const std::string &userSemantic = GetVaryingSemantic(majorShaderModel, pointSize);
unsigned int reservedSemanticIndex = getMaxSemanticIndex();
BuiltinInfo *builtins = &mBuiltinInfo[shaderType];
if (hlsl4)
{
builtins->dxPosition.enableSystem("SV_Position");
}
else if (shaderType == SHADER_PIXEL)
{
builtins->dxPosition.enableSystem("VPOS");
}
else
{
builtins->dxPosition.enableSystem("POSITION");
}
if (position)
{
builtins->glPosition.enable(userSemantic, reservedSemanticIndex++);
}
if (fragCoord)
{
builtins->glFragCoord.enable(userSemantic, reservedSemanticIndex++);
}
if (pointCoord)
{
// SM3 reserves the TEXCOORD semantic for point sprite texcoords (gl_PointCoord)
// In D3D11 we manually compute gl_PointCoord in the GS.
if (hlsl4)
{
builtins->glPointCoord.enable(userSemantic, reservedSemanticIndex++);
}
else
{
builtins->glPointCoord.enable("TEXCOORD", 0);
}
}
// Special case: do not include PSIZE semantic in HLSL 3 pixel shaders
if (pointSize && (shaderType != SHADER_PIXEL || hlsl4))
{
builtins->glPointSize.enableSystem("PSIZE");
}
}
bool DynamicHLSL::generateShaderLinkHLSL(const gl::Data &data,
const gl::Program::Data &programData,
const ProgramD3DMetadata &programMetadata,
const VaryingPacking &varyingPacking,
std::string *pixelHLSL,
std::string *vertexHLSL) const
{
ASSERT(pixelHLSL->empty() && vertexHLSL->empty());
const gl::Shader *vertexShaderGL = programData.getAttachedVertexShader();
const gl::Shader *fragmentShaderGL = programData.getAttachedFragmentShader();
const ShaderD3D *fragmentShader = GetImplAs<ShaderD3D>(fragmentShaderGL);
const int shaderModel = mRenderer->getMajorShaderModel();
// usesViewScale() isn't supported in the D3D9 renderer
ASSERT(shaderModel >= 4 || !programMetadata.usesViewScale());
bool useInstancedPointSpriteEmulation =
programMetadata.usesPointSize() &&
mRenderer->getWorkarounds().useInstancedPointSpriteEmulation;
// Validation done in the compiler
ASSERT(!fragmentShader->usesFragColor() || !fragmentShader->usesFragData());
std::stringstream vertexStream;
vertexStream << vertexShaderGL->getTranslatedSource();
// Instanced PointSprite emulation requires additional entries originally generated in the
// GeometryShader HLSL. These include pointsize clamp values.
if (useInstancedPointSpriteEmulation)
{
vertexStream << "static float minPointSize = "
<< static_cast<int>(data.caps->minAliasedPointSize) << ".0f;\n"
<< "static float maxPointSize = "
<< static_cast<int>(data.caps->maxAliasedPointSize) << ".0f;\n";
}
// Add stub string to be replaced when shader is dynamically defined by its layout
vertexStream << "\n" << VERTEX_ATTRIBUTE_STUB_STRING + "\n";
// Write the HLSL input/output declarations
vertexStream << "struct VS_OUTPUT\n";
generateVaryingLinkHLSL(SHADER_VERTEX, varyingPacking, vertexStream);
vertexStream << "\n"
<< "VS_OUTPUT main(VS_INPUT input)\n"
<< "{\n"
<< " initAttributes(input);\n";
vertexStream << "\n"
<< " gl_main();\n"
<< "\n"
<< " VS_OUTPUT output;\n";
const auto &vertexBuiltins = varyingPacking.builtins(SHADER_VERTEX);
if (vertexBuiltins.glPosition.enabled)
{
vertexStream << " output.gl_Position = gl_Position;\n";
}
// On D3D9 or D3D11 Feature Level 9, we need to emulate large viewports using dx_ViewAdjust.
if (shaderModel >= 4 && mRenderer->getShaderModelSuffix() == "")
{
vertexStream << " output.dx_Position.x = gl_Position.x;\n";
if (programMetadata.usesViewScale())
{
// This code assumes that dx_ViewScale.y = -1.0f when rendering to texture, and +1.0f
// when rendering to the default framebuffer. No other values are valid.
vertexStream << " output.dx_Position.y = dx_ViewScale.y * gl_Position.y;\n";
}
else
{
vertexStream << " output.dx_Position.y = - gl_Position.y;\n";
}
vertexStream << " output.dx_Position.z = (gl_Position.z + gl_Position.w) * 0.5;\n"
<< " output.dx_Position.w = gl_Position.w;\n";
}
else
{
vertexStream << " output.dx_Position.x = gl_Position.x * dx_ViewAdjust.z + "
"dx_ViewAdjust.x * gl_Position.w;\n";
// If usesViewScale() is true and we're using the D3D11 renderer via Feature Level 9_*,
// then we need to multiply the gl_Position.y by the viewScale.
// usesViewScale() isn't supported when using the D3D9 renderer.
if (programMetadata.usesViewScale() &&
(shaderModel >= 4 && mRenderer->getShaderModelSuffix() != ""))
{
vertexStream << " output.dx_Position.y = dx_ViewScale.y * (gl_Position.y * "
"dx_ViewAdjust.w + dx_ViewAdjust.y * gl_Position.w);\n";
}
else
{
vertexStream << " output.dx_Position.y = -(gl_Position.y * dx_ViewAdjust.w + "
"dx_ViewAdjust.y * gl_Position.w);\n";
}
vertexStream << " output.dx_Position.z = (gl_Position.z + gl_Position.w) * 0.5;\n"
<< " output.dx_Position.w = gl_Position.w;\n";
}
// We don't need to output gl_PointSize if we use are emulating point sprites via instancing.
if (vertexBuiltins.glPointSize.enabled)
{
vertexStream << " output.gl_PointSize = gl_PointSize;\n";
}
if (vertexBuiltins.glFragCoord.enabled)
{
vertexStream << " output.gl_FragCoord = gl_Position;\n";
}
for (const PackedVaryingRegister ®isterInfo : varyingPacking.getRegisterList())
{
const auto &packedVarying = *registerInfo.packedVarying;
const auto &varying = *packedVarying.varying;
ASSERT(!varying.isStruct());
vertexStream << " output.v" << registerInfo.semanticIndex << " = ";
if (packedVarying.isStructField())
{
vertexStream << decorateVariable(packedVarying.parentStructName) << ".";
}
vertexStream << decorateVariable(varying.name);
if (varying.isArray())
{
WriteArrayString(vertexStream, registerInfo.varyingArrayIndex);
}
if (VariableRowCount(varying.type) > 1)
{
WriteArrayString(vertexStream, registerInfo.varyingRowIndex);
}
vertexStream << ";\n";
}
// Instanced PointSprite emulation requires additional entries to calculate
// the final output vertex positions of the quad that represents each sprite.
if (useInstancedPointSpriteEmulation)
{
vertexStream << "\n"
<< " gl_PointSize = clamp(gl_PointSize, minPointSize, maxPointSize);\n";
vertexStream << " output.dx_Position.x += (input.spriteVertexPos.x * gl_PointSize / "
"(dx_ViewCoords.x*2)) * output.dx_Position.w;";
if (programMetadata.usesViewScale())
{
// Multiply by ViewScale to invert the rendering when appropriate
vertexStream << " output.dx_Position.y += (-dx_ViewScale.y * "
"input.spriteVertexPos.y * gl_PointSize / (dx_ViewCoords.y*2)) * "
"output.dx_Position.w;";
}
else
{
vertexStream << " output.dx_Position.y += (input.spriteVertexPos.y * gl_PointSize / "
"(dx_ViewCoords.y*2)) * output.dx_Position.w;";
}
vertexStream
<< " output.dx_Position.z += input.spriteVertexPos.z * output.dx_Position.w;\n";
if (programMetadata.usesPointCoord())
{
vertexStream << "\n"
<< " output.gl_PointCoord = input.spriteTexCoord;\n";
}
}
// Renderers that enable instanced pointsprite emulation require the vertex shader output member
// gl_PointCoord to be set to a default value if used without gl_PointSize. 0.5,0.5 is the same
// default value used in the generated pixel shader.
if (programMetadata.usesInsertedPointCoordValue())
{
ASSERT(!useInstancedPointSpriteEmulation);
vertexStream << "\n"
<< " output.gl_PointCoord = float2(0.5, 0.5);\n";
}
vertexStream << "\n"
<< " return output;\n"
<< "}\n";
std::stringstream pixelStream;
pixelStream << fragmentShaderGL->getTranslatedSource();
pixelStream << "struct PS_INPUT\n";
generateVaryingLinkHLSL(SHADER_PIXEL, varyingPacking, pixelStream);
pixelStream << "\n";
pixelStream << PIXEL_OUTPUT_STUB_STRING + "\n";
if (fragmentShader->usesFrontFacing())
{
if (shaderModel >= 4)
{
pixelStream << "PS_OUTPUT main(PS_INPUT input, bool isFrontFace : SV_IsFrontFace)\n"
<< "{\n";
}
else
{
pixelStream << "PS_OUTPUT main(PS_INPUT input, float vFace : VFACE)\n"
<< "{\n";
}
}
else
{
pixelStream << "PS_OUTPUT main(PS_INPUT input)\n"
<< "{\n";
}
const auto &pixelBuiltins = varyingPacking.builtins(SHADER_PIXEL);
if (pixelBuiltins.glFragCoord.enabled)
{
pixelStream << " float rhw = 1.0 / input.gl_FragCoord.w;\n";
// Certain Shader Models (4_0+ and 3_0) allow reading from dx_Position in the pixel shader.
// Other Shader Models (4_0_level_9_3 and 2_x) don't support this, so we emulate it using
// dx_ViewCoords.
if (shaderModel >= 4 && mRenderer->getShaderModelSuffix() == "")
{
pixelStream << " gl_FragCoord.x = input.dx_Position.x;\n"
<< " gl_FragCoord.y = input.dx_Position.y;\n";
}
else if (shaderModel == 3)
{
pixelStream << " gl_FragCoord.x = input.dx_Position.x + 0.5;\n"
<< " gl_FragCoord.y = input.dx_Position.y + 0.5;\n";
}
else
{
// dx_ViewCoords contains the viewport width/2, height/2, center.x and center.y. See
// Renderer::setViewport()
pixelStream << " gl_FragCoord.x = (input.gl_FragCoord.x * rhw) * dx_ViewCoords.x + "
"dx_ViewCoords.z;\n"
<< " gl_FragCoord.y = (input.gl_FragCoord.y * rhw) * dx_ViewCoords.y + "
"dx_ViewCoords.w;\n";
}
if (programMetadata.usesViewScale())
{
// For Feature Level 9_3 and below, we need to correct gl_FragCoord.y to account
// for dx_ViewScale. On Feature Level 10_0+, gl_FragCoord.y is calculated above using
// dx_ViewCoords and is always correct irrespective of dx_ViewScale's value.
// NOTE: usesViewScale() can only be true on D3D11 (i.e. Shader Model 4.0+).
if (shaderModel >= 4 && mRenderer->getShaderModelSuffix() == "")
{
// Some assumptions:
// - dx_ViewScale.y = -1.0f when rendering to texture
// - dx_ViewScale.y = +1.0f when rendering to the default framebuffer
// - gl_FragCoord.y has been set correctly above.
//
// When rendering to the backbuffer, the code inverts gl_FragCoord's y coordinate.
// This involves subtracting the y coordinate from the height of the area being
// rendered to.
//
// First we calculate the height of the area being rendered to:
// render_area_height = (2.0f / (1.0f - input.gl_FragCoord.y * rhw)) *
// gl_FragCoord.y
//
// Note that when we're rendering to default FB, we want our output to be
// equivalent to:
// "gl_FragCoord.y = render_area_height - gl_FragCoord.y"
//
// When we're rendering to a texture, we want our output to be equivalent to:
// "gl_FragCoord.y = gl_FragCoord.y;"
//
// If we set scale_factor = ((1.0f + dx_ViewScale.y) / 2.0f), then notice that
// - When rendering to default FB: scale_factor = 1.0f
// - When rendering to texture: scale_factor = 0.0f
//
// Therefore, we can get our desired output by setting:
// "gl_FragCoord.y = scale_factor * render_area_height - dx_ViewScale.y *
// gl_FragCoord.y"
//
// Simplifying, this becomes:
pixelStream
<< " gl_FragCoord.y = (1.0f + dx_ViewScale.y) * gl_FragCoord.y /"
"(1.0f - input.gl_FragCoord.y * rhw) - dx_ViewScale.y * gl_FragCoord.y;\n";
}
}
pixelStream << " gl_FragCoord.z = (input.gl_FragCoord.z * rhw) * dx_DepthFront.x + "
"dx_DepthFront.y;\n"
<< " gl_FragCoord.w = rhw;\n";
}
if (pixelBuiltins.glPointCoord.enabled && shaderModel >= 3)
{
pixelStream << " gl_PointCoord.x = input.gl_PointCoord.x;\n"
<< " gl_PointCoord.y = 1.0 - input.gl_PointCoord.y;\n";
}
if (fragmentShader->usesFrontFacing())
{
if (shaderModel <= 3)
{
pixelStream << " gl_FrontFacing = (vFace * dx_DepthFront.z >= 0.0);\n";
}
else
{
pixelStream << " gl_FrontFacing = isFrontFace;\n";
}
}
for (const PackedVaryingRegister ®isterInfo : varyingPacking.getRegisterList())
{
const auto &packedVarying = *registerInfo.packedVarying;
const auto &varying = *packedVarying.varying;
ASSERT(!varying.isBuiltIn() && !varying.isStruct());
// Don't reference VS-only transform feedback varyings in the PS.
if (registerInfo.packedVarying->vertexOnly)
continue;
pixelStream << " ";
if (packedVarying.isStructField())
{
pixelStream << decorateVariable(packedVarying.parentStructName) << ".";
}
pixelStream << decorateVariable(varying.name);
if (varying.isArray())
{
WriteArrayString(pixelStream, registerInfo.varyingArrayIndex);
}
GLenum transposedType = TransposeMatrixType(varying.type);
if (VariableRowCount(transposedType) > 1)
{
WriteArrayString(pixelStream, registerInfo.varyingRowIndex);
}
pixelStream << " = input.v" << registerInfo.semanticIndex;
switch (VariableColumnCount(transposedType))
{
case 1:
pixelStream << ".x";
break;
case 2:
pixelStream << ".xy";
break;
case 3:
pixelStream << ".xyz";
break;
case 4:
break;
default:
UNREACHABLE();
}
pixelStream << ";\n";
}
pixelStream << "\n"
<< " gl_main();\n"
<< "\n"
<< " return generateOutput();\n"
<< "}\n";
*vertexHLSL = vertexStream.str();
*pixelHLSL = pixelStream.str();
return true;
}