bool
ShaderValidator::CanLinkTo(const ShaderValidator* prev, nsCString* const out_log) const
{
if (!prev) {
nsPrintfCString error("Passed in NULL prev ShaderValidator.");
*out_log = error;
return false;
}
{
const std::vector<sh::Uniform>* vertPtr = ShGetUniforms(prev->mHandle);
const std::vector<sh::Uniform>* fragPtr = ShGetUniforms(mHandle);
if (!vertPtr || !fragPtr) {
nsPrintfCString error("Could not create uniform list.");
*out_log = error;
return false;
}
for (auto itrFrag = fragPtr->begin(); itrFrag != fragPtr->end(); ++itrFrag) {
for (auto itrVert = vertPtr->begin(); itrVert != vertPtr->end(); ++itrVert) {
if (itrVert->name != itrFrag->name)
continue;
if (!itrVert->isSameUniformAtLinkTime(*itrFrag)) {
nsPrintfCString error("Uniform `%s`is not linkable between"
" attached shaders.",
itrFrag->name.c_str());
*out_log = error;
return false;
}
break;
}
}
}
{
const std::vector<sh::Varying>* vertPtr = ShGetVaryings(prev->mHandle);
const std::vector<sh::Varying>* fragPtr = ShGetVaryings(mHandle);
if (!vertPtr || !fragPtr) {
nsPrintfCString error("Could not create varying list.");
*out_log = error;
return false;
}
nsTArray<ShVariableInfo> staticUseVaryingList;
for (auto itrFrag = fragPtr->begin(); itrFrag != fragPtr->end(); ++itrFrag) {
const ShVariableInfo varInfo = { itrFrag->type,
(int)itrFrag->elementCount() };
static const char prefix[] = "gl_";
if (StartsWith(itrFrag->name, prefix)) {
if (itrFrag->staticUse)
staticUseVaryingList.AppendElement(varInfo);
continue;
}
bool definedInVertShader = false;
bool staticVertUse = false;
for (auto itrVert = vertPtr->begin(); itrVert != vertPtr->end(); ++itrVert) {
if (itrVert->name != itrFrag->name)
continue;
if (!itrVert->isSameVaryingAtLinkTime(*itrFrag)) {
nsPrintfCString error("Varying `%s`is not linkable between"
" attached shaders.",
itrFrag->name.c_str());
*out_log = error;
return false;
}
definedInVertShader = true;
staticVertUse = itrVert->staticUse;
break;
}
if (!definedInVertShader && itrFrag->staticUse) {
nsPrintfCString error("Varying `%s` has static-use in the frag"
" shader, but is undeclared in the vert"
" shader.", itrFrag->name.c_str());
*out_log = error;
return false;
}
if (staticVertUse && itrFrag->staticUse)
staticUseVaryingList.AppendElement(varInfo);
}
if (!ShCheckVariablesWithinPackingLimits(mMaxVaryingVectors,
staticUseVaryingList.Elements(),
staticUseVaryingList.Length()))
{
*out_log = "Statically used varyings do not fit within packing limits. (see"
" GLSL ES Specification 1.0.17, p111)";
return false;
}
}
return true;
}
bool
ShaderValidator::CanLinkTo(const ShaderValidator* prev, nsCString* const out_log) const
{
if (!prev) {
nsPrintfCString error("Passed in NULL prev ShaderValidator.");
*out_log = error;
return false;
}
const auto shaderVersion = ShGetShaderVersion(mHandle);
if (ShGetShaderVersion(prev->mHandle) != shaderVersion) {
nsPrintfCString error("Vertex shader version %d does not match"
" fragment shader version %d.",
ShGetShaderVersion(prev->mHandle),
ShGetShaderVersion(mHandle));
*out_log = error;
return false;
}
{
const std::vector<sh::Uniform>* vertPtr = ShGetUniforms(prev->mHandle);
const std::vector<sh::Uniform>* fragPtr = ShGetUniforms(mHandle);
if (!vertPtr || !fragPtr) {
nsPrintfCString error("Could not create uniform list.");
*out_log = error;
return false;
}
for (auto itrFrag = fragPtr->begin(); itrFrag != fragPtr->end(); ++itrFrag) {
for (auto itrVert = vertPtr->begin(); itrVert != vertPtr->end(); ++itrVert) {
if (itrVert->name != itrFrag->name)
continue;
if (!itrVert->isSameUniformAtLinkTime(*itrFrag)) {
nsPrintfCString error("Uniform `%s` is not linkable between"
" attached shaders.",
itrFrag->name.c_str());
*out_log = error;
return false;
}
break;
}
}
}
{
const auto vertVars = sh::GetInterfaceBlocks(prev->mHandle);
const auto fragVars = sh::GetInterfaceBlocks(mHandle);
if (!vertVars || !fragVars) {
nsPrintfCString error("Could not create uniform block list.");
*out_log = error;
return false;
}
for (const auto& fragVar : *fragVars) {
for (const auto& vertVar : *vertVars) {
if (vertVar.name != fragVar.name)
continue;
if (!vertVar.isSameInterfaceBlockAtLinkTime(fragVar)) {
nsPrintfCString error("Interface block `%s` is not linkable between"
" attached shaders.",
fragVar.name.c_str());
*out_log = error;
return false;
}
break;
}
}
}
const auto& vertVaryings = ShGetVaryings(prev->mHandle);
const auto& fragVaryings = ShGetVaryings(mHandle);
if (!vertVaryings || !fragVaryings) {
nsPrintfCString error("Could not create varying list.");
*out_log = error;
return false;
}
{
std::vector<sh::ShaderVariable> staticUseVaryingList;
for (const auto& fragVarying : *fragVaryings) {
static const char prefix[] = "gl_";
if (StartsWith(fragVarying.name, prefix)) {
if (fragVarying.staticUse) {
staticUseVaryingList.push_back(fragVarying);
}
continue;
}
bool definedInVertShader = false;
bool staticVertUse = false;
for (const auto& vertVarying : *vertVaryings) {
if (vertVarying.name != fragVarying.name)
continue;
if (!vertVarying.isSameVaryingAtLinkTime(fragVarying, shaderVersion)) {
nsPrintfCString error("Varying `%s`is not linkable between"
" attached shaders.",
fragVarying.name.c_str());
*out_log = error;
return false;
}
definedInVertShader = true;
staticVertUse = vertVarying.staticUse;
break;
}
if (!definedInVertShader && fragVarying.staticUse) {
nsPrintfCString error("Varying `%s` has static-use in the frag"
" shader, but is undeclared in the vert"
" shader.", fragVarying.name.c_str());
*out_log = error;
return false;
}
if (staticVertUse && fragVarying.staticUse) {
staticUseVaryingList.push_back(fragVarying);
}
}
if (!ShCheckVariablesWithinPackingLimits(mMaxVaryingVectors,
staticUseVaryingList))
{
*out_log = "Statically used varyings do not fit within packing limits. (see"
" GLSL ES Specification 1.0.17, p111)";
return false;
}
}
if (shaderVersion == 100) {
// Enforce ESSL1 invariant linking rules.
bool isInvariant_Position = false;
bool isInvariant_PointSize = false;
bool isInvariant_FragCoord = false;
bool isInvariant_PointCoord = false;
for (const auto& varying : *vertVaryings) {
if (varying.name == "gl_Position") {
isInvariant_Position = varying.isInvariant;
} else if (varying.name == "gl_PointSize") {
isInvariant_PointSize = varying.isInvariant;
}
}
for (const auto& varying : *fragVaryings) {
if (varying.name == "gl_FragCoord") {
isInvariant_FragCoord = varying.isInvariant;
} else if (varying.name == "gl_PointCoord") {
isInvariant_PointCoord = varying.isInvariant;
}
}
////
const auto fnCanBuiltInsLink = [](bool vertIsInvariant, bool fragIsInvariant) {
if (vertIsInvariant)
return true;
return !fragIsInvariant;
};
if (!fnCanBuiltInsLink(isInvariant_Position, isInvariant_FragCoord)) {
*out_log = "gl_Position must be invariant if gl_FragCoord is. (see GLSL ES"
" Specification 1.0.17, p39)";
return false;
}
if (!fnCanBuiltInsLink(isInvariant_PointSize, isInvariant_PointCoord)) {
*out_log = "gl_PointSize must be invariant if gl_PointCoord is. (see GLSL ES"
" Specification 1.0.17, p39)";
return false;
}
}
return true;
}
