//-----------------------------------------------------------------------------
void GLSLGpuProgram::bindProgramPassIterationParameters(GpuProgramParametersSharedPtr params)
{
// activate the link program object
GLSLLinkProgram* linkProgram = GLSLLinkProgramManager::getSingleton().getActiveLinkProgram();
// pass on parameters from params to program object uniforms
linkProgram->updatePassIterationUniforms( params );
}
//-----------------------------------------------------------------------------
void GLSLGpuProgram::bindProgramParameters(GpuProgramParametersSharedPtr params, uint16 mask)
{
// link can throw exceptions, ignore them at this point
try
{
// activate the link program object
GLSLLinkProgram* linkProgram = GLSLLinkProgramManager::getSingleton().getActiveLinkProgram();
// pass on parameters from params to program object uniforms
linkProgram->updateUniforms(params, mask, mType);
}
catch (Exception& e) {}
}
//-----------------------------------------------------------------------------
bool GLSLGpuProgram::isAttributeValid(VertexElementSemantic semantic, uint index)
{
// get link program - only call this in the context of bound program
GLSLLinkProgram* linkProgram = GLSLLinkProgramManager::getSingleton().getActiveLinkProgram();
if (linkProgram->isAttributeValid(semantic, index))
{
return true;
}
else
{
// fall back to default implementation, allow default bindings
return GLGpuProgram::isAttributeValid(semantic, index);
}
}
//-----------------------------------------------------------------------------
void GL3PlusRenderToVertexBuffer::bindVerticesOutput(Pass* pass)
{
VertexDeclaration* declaration = mVertexData->vertexDeclaration;
size_t elemCount = declaration->getElementCount();
if (elemCount > 0)
{
GLuint linkProgramId = 0;
// Have GLSL shaders, using varying attributes
if(Root::getSingleton().getRenderSystem()->getCapabilities()->hasCapability(RSC_SEPARATE_SHADER_OBJECTS))
{
GLSLProgramPipeline* programPipeline =
GLSLProgramPipelineManager::getSingleton().getActiveProgramPipeline();
linkProgramId = programPipeline->getGLProgramPipelineHandle();
}
else
{
GLSLLinkProgram* linkProgram = GLSLLinkProgramManager::getSingleton().getActiveLinkProgram();
linkProgramId = linkProgram->getGLProgramHandle();
}
// 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.
// const GLchar *names[64];
const GLchar *names[1] = {"gl_Position"};//, "oUv0", "oUv1", "oUv2" };
// vector<const GLchar*>::type names;
// for (unsigned short e = 0; e < elemCount; e++)
// {
// const VertexElement* element = declaration->getElement(e);
// String varyingName = getSemanticVaryingName(element->getSemantic(), element->getIndex());
// names[e] = varyingName.c_str();
//// names.push_back(varyingName.c_str());
// }
OGRE_CHECK_GL_ERROR(glTransformFeedbackVaryings(linkProgramId, elemCount, names, GL_INTERLEAVED_ATTRIBS));
OGRE_CHECK_GL_ERROR(glLinkProgram(linkProgramId));
GLint didLink = 0;
OGRE_CHECK_GL_ERROR(glGetProgramiv( linkProgramId, GL_LINK_STATUS, &didLink ));
logObjectInfo( String("RVB GLSL link result : "), linkProgramId );
if(glIsProgram(linkProgramId))
{
glValidateProgram(linkProgramId);
}
logObjectInfo( String("RVB GLSL validation result : "), linkProgramId );
}
}
//-----------------------------------------------------------------------------
void GLSLGpuProgram::bindProgramPassIterationParameters(GpuProgramParametersSharedPtr params)
{
if(Root::getSingleton().getRenderSystem()->getCapabilities()->hasCapability(RSC_SEPARATE_SHADER_OBJECTS))
{
// Activate the program pipeline object
GLSLProgramPipeline* programPipeline = GLSLProgramPipelineManager::getSingleton().getActiveProgramPipeline();
// Pass on parameters from params to program object uniforms
programPipeline->updatePassIterationUniforms( params );
}
else
{
// Activate the link program object
GLSLLinkProgram* linkProgram = GLSLLinkProgramManager::getSingleton().getActiveLinkProgram();
// Pass on parameters from params to program object uniforms
linkProgram->updatePassIterationUniforms( params );
}
}
//-----------------------------------------------------------------------------
void GLSLGpuProgram::bindProgramParameters(GpuProgramParametersSharedPtr params, uint16 mask)
{
// Link can throw exceptions, ignore them at this point
try
{
if(Root::getSingleton().getRenderSystem()->getCapabilities()->hasCapability(RSC_SEPARATE_SHADER_OBJECTS))
{
// Activate the program pipeline object
GLSLProgramPipeline* programPipeline = GLSLProgramPipelineManager::getSingleton().getActiveProgramPipeline();
// Pass on parameters from params to program object uniforms
programPipeline->updateUniforms(params, mask, mType);
}
else
{
// Activate the link program object
GLSLLinkProgram* linkProgram = GLSLLinkProgramManager::getSingleton().getActiveLinkProgram();
// Pass on parameters from params to program object uniforms
linkProgram->updateUniforms(params, mask, mType);
}
}
catch (Exception& e) {}
}
//-----------------------------------------------------------------------------
void GLRenderToVertexBuffer::bindVerticesOutput(Pass* pass)
{
VertexDeclaration* declaration = mVertexData->vertexDeclaration;
bool useVaryingAttributes = false;
//Check if we are FixedFunc/ASM shaders (Static attributes) or GLSL (Varying attributes)
//We assume that there isn't a mix of GLSL and ASM as this is illegal
GpuProgram* sampleProgram = 0;
if (pass->hasVertexProgram())
{
sampleProgram = pass->getVertexProgram().getPointer();
}
else if (pass->hasGeometryProgram())
{
sampleProgram = pass->getGeometryProgram().getPointer();
}
if ((sampleProgram != 0) && (sampleProgram->getLanguage() == "glsl"))
{
useVaryingAttributes = true;
}
if (useVaryingAttributes)
{
//Have GLSL shaders, using varying attributes
GLSLLinkProgram* linkProgram = GLSLLinkProgramManager::getSingleton().getActiveLinkProgram();
GLhandleARB linkProgramId = linkProgram->getGLHandle();
vector<GLint>::type locations;
for (unsigned short e=0; e < declaration->getElementCount(); e++)
{
const VertexElement* element =declaration->getElement(e);
String varyingName = getSemanticVaryingName(element->getSemantic(), element->getIndex());
GLint location = glGetVaryingLocationNV(linkProgramId, varyingName.c_str());
if (location < 0)
{
OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR,
"GLSL link program does not output " + varyingName +
" so it cannot fill the requested vertex buffer",
"OgreGLRenderToVertexBuffer::bindVerticesOutput");
}
locations.push_back(location);
}
glTransformFeedbackVaryingsNV(
linkProgramId, static_cast<GLsizei>(locations.size()),
&locations[0], GL_INTERLEAVED_ATTRIBS_NV);
}
else
{
//Either fixed function or assembly (CG = assembly) shaders
vector<GLint>::type attribs;
for (unsigned short e=0; e < declaration->getElementCount(); e++)
{
const VertexElement* element = declaration->getElement(e);
//Type
attribs.push_back(getGLSemanticType(element->getSemantic()));
//Number of components
attribs.push_back(VertexElement::getTypeCount(element->getType()));
//Index
attribs.push_back(element->getIndex());
}
glTransformFeedbackAttribsNV(
static_cast<GLuint>(declaration->getElementCount()),
&attribs[0], GL_INTERLEAVED_ATTRIBS_NV);
}
checkGLError(true, true, "GLRenderToVertexBuffer::bindVerticesOutput");
}
//-----------------------------------------------------------------------------
void GL3PlusRenderToVertexBuffer::update(SceneManager* sceneMgr)
{
size_t bufSize = mVertexData->vertexDeclaration->getVertexSize(0) * mMaxVertexCount;
if (mVertexBuffers[0].isNull() || mVertexBuffers[0]->getSizeInBytes() != bufSize)
{
// Buffers don't match. Need to reallocate.
mResetRequested = true;
}
// Single pass only for now
Ogre::Pass* r2vbPass = mMaterial->getBestTechnique()->getPass(0);
// Set pass before binding buffers to activate the GPU programs
sceneMgr->_setPass(r2vbPass);
bindVerticesOutput(r2vbPass);
RenderOperation renderOp;
size_t targetBufferIndex;
if (mResetRequested || mResetsEveryUpdate)
{
// Use source data to render to first buffer
mSourceRenderable->getRenderOperation(renderOp);
targetBufferIndex = 0;
}
else
{
// Use current front buffer to render to back buffer
this->getRenderOperation(renderOp);
targetBufferIndex = 1 - mFrontBufferIndex;
}
if (mVertexBuffers[targetBufferIndex].isNull() ||
mVertexBuffers[targetBufferIndex]->getSizeInBytes() != bufSize)
{
reallocateBuffer(targetBufferIndex);
}
// Disable rasterization
OGRE_CHECK_GL_ERROR(glEnable(GL_RASTERIZER_DISCARD));
GL3PlusHardwareVertexBuffer* vertexBuffer = static_cast<GL3PlusHardwareVertexBuffer*>(mVertexBuffers[targetBufferIndex].getPointer());
// Bind the target buffer
OGRE_CHECK_GL_ERROR(glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0, vertexBuffer->getGLBufferId()));
if(Root::getSingleton().getRenderSystem()->getCapabilities()->hasCapability(RSC_SEPARATE_SHADER_OBJECTS))
{
GLSLProgramPipeline* programPipeline =
GLSLProgramPipelineManager::getSingleton().getActiveProgramPipeline();
programPipeline->getVertexArrayObject()->bind();
}
else
{
GLSLLinkProgram* linkProgram = GLSLLinkProgramManager::getSingleton().getActiveLinkProgram();
linkProgram->getVertexArrayObject()->bind();
}
// Bind the target buffer
OGRE_CHECK_GL_ERROR(glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0, vertexBuffer->getGLBufferId()));
// Disable rasterization
OGRE_CHECK_GL_ERROR(glEnable(GL_RASTERIZER_DISCARD));
RenderSystem* targetRenderSystem = Root::getSingleton().getRenderSystem();
// Draw the object
targetRenderSystem->_setWorldMatrix(Matrix4::IDENTITY);
targetRenderSystem->_setViewMatrix(Matrix4::IDENTITY);
targetRenderSystem->_setProjectionMatrix(Matrix4::IDENTITY);
if (r2vbPass->hasVertexProgram())
{
targetRenderSystem->bindGpuProgramParameters(GPT_VERTEX_PROGRAM,
r2vbPass->getVertexProgramParameters(), GPV_ALL);
}
if (r2vbPass->hasFragmentProgram())
{
targetRenderSystem->bindGpuProgramParameters(GPT_FRAGMENT_PROGRAM,
r2vbPass->getFragmentProgramParameters(), GPV_ALL);
}
if (r2vbPass->hasGeometryProgram())
{
targetRenderSystem->bindGpuProgramParameters(GPT_GEOMETRY_PROGRAM,
r2vbPass->getGeometryProgramParameters(), GPV_ALL);
}
OGRE_CHECK_GL_ERROR(glBeginQuery(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN, mPrimitivesDrawnQuery));
OGRE_CHECK_GL_ERROR(glBeginTransformFeedback(getR2VBPrimitiveType(mOperationType)));
targetRenderSystem->_render(renderOp);
OGRE_CHECK_GL_ERROR(glEndTransformFeedback());
// Finish the query
OGRE_CHECK_GL_ERROR(glEndQuery(GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN));
OGRE_CHECK_GL_ERROR(glDisable(GL_RASTERIZER_DISCARD));
// Read back query results
GLuint primitivesWritten;
OGRE_CHECK_GL_ERROR(glGetQueryObjectuiv(mPrimitivesDrawnQuery, GL_QUERY_RESULT, &primitivesWritten));
mVertexData->vertexCount = primitivesWritten * getVertexCountPerPrimitive(mOperationType);
// Switch the vertex binding if necessary
if (targetBufferIndex != mFrontBufferIndex)
{
mVertexData->vertexBufferBinding->unsetAllBindings();
mVertexData->vertexBufferBinding->setBinding(0, mVertexBuffers[targetBufferIndex]);
mFrontBufferIndex = targetBufferIndex;
}
// Enable rasterization
OGRE_CHECK_GL_ERROR(glDisable(GL_RASTERIZER_DISCARD));
// Clear the reset flag
mResetRequested = false;
}