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GPU_framebuffer: Fix performance issue on intel. 

This should fixes the error message that a stall occured because of busy mipmap.

This happened on the minmax buffer generation and introduced a random 0.2ms latency.
I'm not sure of what was happening though.
This commit is contained in:
Clément Foucault 2017-08-12 16:16:28 +02:00
parent b858b44f2e
commit 57f1475b18
1 changed files with 3 additions and 2 deletions
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5
source/blender/gpu/intern/gpu_framebuffer.c
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@ -543,6 +543,7 @@ void GPU_framebuffer_blit(GPUFrameBuffer *fb_read, int read_slot, GPUFrameBuffer
void GPU_framebuffer_recursive_downsample(
GPUFrameBuffer *fb, GPUTexture *tex, int num_iter, void (*callback)(void *userData, int level), void *userData)
{
int i;
int current_dim[2] = {GPU_texture_width(tex), GPU_texture_height(tex)};
GLenum attachment;
@ -567,7 +568,7 @@ void GPU_framebuffer_recursive_downsample(
glReadBuffer(GL_COLOR_ATTACHMENT0);
}
for (int i=1; i < num_iter+1 && (current_dim[0] > 1 && current_dim[1] > 1); i++) {
for (i=1; i < num_iter+1 && (current_dim[0] > 4 && current_dim[1] > 4); i++) {
/* calculate next viewport size */
current_dim[0] /= 2;
@ -595,7 +596,7 @@ void GPU_framebuffer_recursive_downsample(
/* reset mipmap level range for the depth image */
GPU_texture_bind(tex, 0);
glTexParameteri(GPU_texture_target(tex), GL_TEXTURE_BASE_LEVEL, 0);
glTexParameteri(GPU_texture_target(tex), GL_TEXTURE_MAX_LEVEL, num_iter);
glTexParameteri(GPU_texture_target(tex), GL_TEXTURE_MAX_LEVEL, i);
GPU_texture_unbind(tex);
}