I am a beginner. I have a problem with my frame rate. I am trying to see my GPUs maximum performance with using VBO. I saw that everybody says a GPU can draw 1 billion triangles (so 3 billion vertices) with VBO easily, is it right? If it is right, then why am I getting 37 FPS at only 8 million triangles (24 million vertices)?
I am not using a shader and I don't know how to use it.
My GPU is (amd radeon hd 6870).
When drawing 20k triangles, the frame rate is 6000, when drawing 8 million triangles, the frame rate is 37 and CPU usage 1%. I don't think the CPU is the bottleneck..
My code is like this:
I create in header file
I made an
glGenBuffers(1,&terrainVBO); glBindBuffer(GL_ARRAY_BUFFER,terrainVBO); glBufferData(GL_ARRAY_BUFFER,terrainVertices.size()*sizeof(terrainVec),&terrainVertices,GL_STATIC_DRAW);
and draw in my main loop:
glBindBuffer(GL_ARRAY_BUFFER,terrainVBO); glEnableClientState(GL_VERTEX_ARRAY); glVertexPointer(3,GL_FLOAT,3*sizeof(float),0); glDrawArrays(GL_TRIANGLES,0,terrainVertices.size()); glDisableClientState(GL_VERTEX_ARRAY); glBindBuffer(GL_ARRAY_BUFFER,0);
Summary: How can I draw 500-600 millions triangles (1.5 billion vertices) with a good frame rate? I could only draw 8 million triangles.