void GLSLProgram::setTransformFeedbackVaryings(const std::vector<String>& nameStrings)
{
// Get program object ID.
GLuint programId;
if (Root::getSingleton().getRenderSystem()->getCapabilities()->hasCapability(RSC_SEPARATE_SHADER_OBJECTS))
{
//TODO include tessellation stages
GLSLShader* glslGpuProgram = getGeometryShader();
if (!glslGpuProgram)
glslGpuProgram = getVertexShader();
programId = glslGpuProgram->getGLProgramHandle();
// force re-link
GpuProgramManager::getSingleton().removeMicrocodeFromCache(glslGpuProgram->_getHash());
glslGpuProgram->setLinked(false);
}
else
{
programId = getGLProgramHandle();
// force re-link
GpuProgramManager::getSingleton().removeMicrocodeFromCache(getCombinedHash());
}
mLinked = false;
// Convert to const char * for GL
std::vector<const char*> names;
for (uint e = 0; e < nameStrings.size(); e++)
{
names.push_back(nameStrings[e].c_str());
}
// TODO replace glTransformFeedbackVaryings with in-shader specification (GL 4.4)
OGRE_CHECK_GL_ERROR(glTransformFeedbackVaryings(programId, nameStrings.size(), &names[0],
GL_INTERLEAVED_ATTRIBS));
#if OGRE_DEBUG_MODE
activate();
// Check if varyings were successfully set.
GLchar Name[64];
GLsizei Length(0);
GLsizei Size(0);
GLenum Type(0);
// bool Validated = false;
for (size_t i = 0; i < nameStrings.size(); i++)
{
OGRE_CHECK_GL_ERROR(
glGetTransformFeedbackVarying(programId, i, 64, &Length, &Size, &Type, Name));
LogManager::getSingleton().stream() << "Varying " << i << ": " << Name << " " << Length
<< " " << Size << " " << Type;
// Validated = (Size == 1) && (Type == GL_FLOAT_VEC3);
// std::cout << Validated << " " << GL_FLOAT_VEC3 << std::endl;
}
#endif
}
void GL3PlusRenderToVertexBuffer::bindVerticesOutput(Pass* pass)
{
VertexDeclaration* declaration = mVertexData->vertexDeclaration;
size_t elemCount = declaration->getElementCount();
if (elemCount == 0)
return;
// Get program object ID.
GLuint programId = 0;
if (Root::getSingleton().getRenderSystem()->getCapabilities()->hasCapability(RSC_SEPARATE_SHADER_OBJECTS))
{
GLSLSeparableProgram* separableProgram =
GLSLSeparableProgramManager::getSingleton().getCurrentSeparableProgram();
GLSLShader* glslGpuProgram = 0;
if ((glslGpuProgram = separableProgram->getGeometryShader()))
programId = glslGpuProgram->getGLProgramHandle();
//TODO include tessellation stages
else // vertex program
programId = separableProgram->getVertexShader()->getGLProgramHandle();
}
else
{
GLSLMonolithicProgram* monolithicProgram = GLSLMonolithicProgramManager::getSingleton().getActiveMonolithicProgram();
programId = monolithicProgram->getGLProgramHandle();
}
// Store the output in a buffer. The buffer has the same
// structure as the shader output vertex data.
// Note: 64 is the minimum number of interleaved
// attributes allowed by GL_EXT_transform_feedback so we
// are using it. Otherwise we could query during
// rendersystem initialisation and use a dynamic sized
// array. But that would require C99.
size_t sourceBufferIndex = mTargetBufferIndex == 0 ? 1 : 0;
// Bind and fill vertex arrays + buffers.
reallocateBuffer(sourceBufferIndex);
reallocateBuffer(mTargetBufferIndex);
// GL3PlusHardwareVertexBuffer* sourceVertexBuffer = static_cast<GL3PlusHardwareVertexBuffer*>(mVertexBuffers[mSourceBufferIndex].getPointer());
// GL3PlusHardwareVertexBuffer* targetVertexBuffer = static_cast<GL3PlusHardwareVertexBuffer*>(mVertexBuffers[mTargetBufferIndex].getPointer());
//TODO GL4+ glBindTransformFeedback
// Dynamically determine shader output variable names.
std::vector<String> nameStrings;
std::vector<const GLchar*> names;
for (uint e = 0; e < elemCount; e++)
{
const VertexElement* element = declaration->getElement(e);
String name = getSemanticVaryingName(element->getSemantic(), element->getIndex());
nameStrings.push_back(name);
}
// Convert to const char * for GL
for (uint e = 0; e < elemCount; e++)
{
names.push_back(nameStrings[e].c_str());
}
//TODO replace glTransformFeedbackVaryings with in-shader specification (GL 4.4)
OGRE_CHECK_GL_ERROR(glTransformFeedbackVaryings(programId, elemCount, &names[0], GL_INTERLEAVED_ATTRIBS));
if (Root::getSingleton().getRenderSystem()->getCapabilities()->hasCapability(RSC_SEPARATE_SHADER_OBJECTS))
{
GLSLSeparableProgram* separableProgram =
GLSLSeparableProgramManager::getSingleton().getCurrentSeparableProgram();
separableProgram->activate();
}
else
{
OGRE_CHECK_GL_ERROR(glLinkProgram(programId));
}
#if OGRE_DEBUG_MODE
// Check if program linking was successful.
GLint didLink = 0;
OGRE_CHECK_GL_ERROR(glGetProgramiv(programId, GL_LINK_STATUS, &didLink));
logObjectInfo(String("RVB GLSL link result : "), programId);
if (glIsProgram(programId))
{
glValidateProgram(programId);
}
logObjectInfo(String("RVB GLSL validation result : "), programId);
// Check if varyings were successfully set.
GLchar Name[64];
GLsizei Length(0);
GLsizei Size(0);
GLenum Type(0);
// bool Validated = false;
for (size_t i = 0; i < elemCount; i++)
{
OGRE_CHECK_GL_ERROR(glGetTransformFeedbackVarying(
programId, i, 64, &Length, &Size, &Type, Name
));
std::cout << "Varying " << i << ": " << Name <<" "<< Length <<" "<< Size <<" "<< Type << std::endl;
// Validated = (Size == 1) && (Type == GL_FLOAT_VEC3);
// std::cout << Validated << " " << GL_FLOAT_VEC3 << std::endl;
}
#endif
}