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rhi: gl: reduce uniform location table prealloc to 32

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Not sure why we used 256 given the typical shaders used with Qt.
A prealloc of 256 means 8328 bytes on the stack, which feels excessive,
and shows up in profiler hotspots for some reason.

Task-number: QTBUG-125087
Pick-to: 6.7 6.6 6.5
Change-Id: Ibae26dae95cbc8d0e9ea53423daa151e768a93b2
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
(cherry picked from commit fb2e33b65aea28609996c4e1ac59c3ee75e5b839)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Laszlo Agocs 2024-06-28 17:32:58 +02:00 committed by Qt Cherry-pick Bot
parent 9745c3d708
commit a682cb9596
2 changed files with 7 additions and 6 deletions
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8
src/gui/rhi/qrhigles2.cpp
View File

@ -4991,7 +4991,7 @@ void QRhiGles2::registerUniformIfActive(const QShaderDescription::BlockVariable
int binding,
int baseOffset,
GLuint program,
QDuplicateTracker<int, 256> *activeUniformLocations,
ActiveUniformLocationTracker *activeUniformLocations,
QGles2UniformDescriptionVector *dst)
{
if (var.type == QShaderDescription::Struct) {
@ -5024,7 +5024,7 @@ void QRhiGles2::registerUniformIfActive(const QShaderDescription::BlockVariable
void QRhiGles2::gatherUniforms(GLuint program,
const QShaderDescription::UniformBlock &ub,
QDuplicateTracker<int, 256> *activeUniformLocations,
ActiveUniformLocationTracker *activeUniformLocations,
QGles2UniformDescriptionVector *dst)
{
QByteArray prefix = ub.structName + '.';
@ -6379,7 +6379,7 @@ bool QGles2GraphicsPipeline::create()
// Use the same work area for the vertex & fragment stages, thus ensuring
// that we will not do superfluous glUniform calls for uniforms that are
// present in both shaders.
QDuplicateTracker<int, 256> activeUniformLocations;
QRhiGles2::ActiveUniformLocationTracker activeUniformLocations;
for (const QRhiShaderStage &shaderStage : std::as_const(m_shaderStages)) {
if (isGraphicsStage(shaderStage)) {
@ -6496,7 +6496,7 @@ bool QGles2ComputePipeline::create()
}
}
QDuplicateTracker<int, 256> activeUniformLocations;
QRhiGles2::ActiveUniformLocationTracker activeUniformLocations;
for (const QShaderDescription::UniformBlock &ub : csDesc.uniformBlocks())
rhiD->gatherUniforms(program, ub, &activeUniformLocations, &uniforms);
for (const QShaderDescription::InOutVariable &v : csDesc.combinedImageSamplers())

5
src/gui/rhi/qrhigles2_p.h
View File

@ -901,13 +901,14 @@ public:
QByteArray shaderSource(const QRhiShaderStage &shaderStage, QShaderVersion *shaderVersion);
bool compileShader(GLuint program, const QRhiShaderStage &shaderStage, QShaderVersion *shaderVersion);
bool linkProgram(GLuint program);
using ActiveUniformLocationTracker = QDuplicateTracker<int, 32>;
void registerUniformIfActive(const QShaderDescription::BlockVariable &var,
const QByteArray &namePrefix, int binding, int baseOffset,
GLuint program,
QDuplicateTracker<int, 256> *activeUniformLocations,
ActiveUniformLocationTracker *activeUniformLocations,
QGles2UniformDescriptionVector *dst);
void gatherUniforms(GLuint program, const QShaderDescription::UniformBlock &ub,
QDuplicateTracker<int, 256> *activeUniformLocations, QGles2UniformDescriptionVector *dst);
ActiveUniformLocationTracker *activeUniformLocations, QGles2UniformDescriptionVector *dst);
void gatherSamplers(GLuint program, const QShaderDescription::InOutVariable &v,
QGles2SamplerDescriptionVector *dst);
void gatherGeneratedSamplers(GLuint program,