gl_rasterizer_cache: Use GL_STREAM_COPY for PBOs
Since the data is doing the path CPU -> GPU -> GPU copy is the most approximate hint. Using GL_STREAM_DRAW generated a performance warning on Nvidia's stack. Changing this hint removed the warning.
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@ -452,7 +452,7 @@ static void CopySurface(const Surface& src_surface, const Surface& dst_surface,
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const std::size_t buffer_size = std::max(src_params.size_in_bytes, dst_params.size_in_bytes);
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glBindBuffer(GL_PIXEL_PACK_BUFFER, copy_pbo_handle);
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glBufferData(GL_PIXEL_PACK_BUFFER, buffer_size, nullptr, GL_STREAM_DRAW);
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glBufferData(GL_PIXEL_PACK_BUFFER, buffer_size, nullptr, GL_STREAM_COPY);
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if (source_format.compressed) {
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glGetCompressedTextureImage(src_surface->Texture().handle, src_attachment,
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static_cast<GLsizei>(src_params.size_in_bytes), nullptr);
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