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st/mesa: add missing MemoryBarrier bits and some explanations

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Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
This commit is contained in:
Nicolai Hähnle 2016-03-17 19:49:26 -05:00
parent b15b1faefd
commit fc94bc2986
1 changed files with 24 additions and 1 deletions
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25
src/mesa/state_tracker/st_cb_texturebarrier.c
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@ -75,14 +75,37 @@ st_MemoryBarrier(struct gl_context *ctx, GLbitfield barriers)
flags |= PIPE_BARRIER_IMAGE;
if (barriers & GL_COMMAND_BARRIER_BIT)
flags |= PIPE_BARRIER_INDIRECT_BUFFER;
if (barriers & GL_PIXEL_BUFFER_BARRIER_BIT)
if (barriers & GL_PIXEL_BUFFER_BARRIER_BIT) {
/* The PBO may be
* (1) bound as a texture for PBO uploads, or
* (2) accessed by the CPU via transfer ops.
* For case (2), we assume automatic flushing by the driver.
*/
flags |= PIPE_BARRIER_TEXTURE;
}
/* GL_TEXTURE_UPDATE_BARRIER_BIT:
* Texture updates translate to:
* (1) texture transfers to/from the CPU,
* (2) texture as blit destination, or
* (3) texture as framebuffer.
* In all cases, we assume the driver does the required flushing
* automatically.
*/
/* GL_BUFFER_UPDATE_BARRIER_BIT:
* Buffer updates translate to
* (1) buffer transfers to/from the CPU,
* (2) resource copies and clears.
* In all cases, we assume the driver does the required flushing
* automatically.
*/
if (barriers & GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT)
flags |= PIPE_BARRIER_MAPPED_BUFFER;
if (barriers & GL_QUERY_BUFFER_BARRIER_BIT)
flags |= PIPE_BARRIER_QUERY_BUFFER;
if (barriers & GL_FRAMEBUFFER_BARRIER_BIT)
flags |= PIPE_BARRIER_FRAMEBUFFER;
if (barriers & GL_TRANSFORM_FEEDBACK_BARRIER_BIT)
flags |= PIPE_BARRIER_STREAMOUT_BUFFER;
if (barriers & GL_ATOMIC_COUNTER_BARRIER_BIT)
flags |= PIPE_BARRIER_SHADER_BUFFER;
if (barriers & GL_SHADER_STORAGE_BARRIER_BIT)