void CRendererGL::render(class IDrawBuffer* buffer)
{
const IRenderBuffer *renderBuffer = buffer->getRenderBuffer();
/*std::cout << "Render: " << renderBuffer->getNumVertices() << " vertices, " << renderBuffer->getNumIndices() << " indices, "
<< buffer->getNumRenderBatches() << " batches" << std::endl;*/
const CVertex2D* vertices = renderBuffer->getVertices();
const uint16* indices = renderBuffer->getIndices();
glBindBuffer(GL_ARRAY_BUFFER, g_VBO);
glBufferData(GL_ARRAY_BUFFER, renderBuffer->getNumVertices() * sizeof(CVertex2D), vertices, GL_STREAM_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_IBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, renderBuffer->getNumIndices() * sizeof(uint16), indices, GL_STREAM_DRAW);
glBindVertexArray(g_VAO);
//initialize a fresh render state
CRenderState state = CRenderState();
updateRenderState(0xFFFFFFFF, state);
for ( uint32 i=0; i<buffer->getNumRenderBatches(); ++i )
{
const CRenderBatch* batch = buffer->getRenderBatches() + i;
const CRenderState& newState = batch->getRenderState();
uint32 changeFlags = newState.getStateChangeFlags(state);
if ( changeFlags != ERenderStateChangeFlags::RSTATECHANGE_NONE )
{
updateRenderState(changeFlags, newState);
}
renderBatch(batch);
state = batch->getRenderState();
}
glBindVertexArray(0);
}
void OpenGL3DRenderer::renderFrame()
{
// Enable Z buffer for 3d z-order effecrt
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL); // Depth function set to less or equal
// Clear Z buffer buffer
glClearDepth(1.0);
glClear(GL_DEPTH_BUFFER_BIT);
// Enable alpha blend for transparency effect
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
_default3DProgram->use();
if (_triangles3DBatch.sizeInBytes() > 0)
renderBatch(GL_TRIANGLES, _triangles3DBatch);
_default3DProgram->disable();
_default3DProgramSetup->tearDown();
}
