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[client] egl: use proper atomics for pbo counting

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This commit is contained in:
Geoffrey McRae 2020-05-18 09:06:11 +10:00
parent 21987cb423
commit f96f0fecda
2 changed files with 13 additions and 9 deletions
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2
VERSION
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@ -1 +1 @@
B1-192-g18cc8d7cab+1
B1-193-g21987cb423+1

20
client/renderers/EGL/texture.c
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@ -27,6 +27,7 @@ Place, Suite 330, Boston, MA 02111-1307 USA
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdatomic.h>
#include <SDL2/SDL_egl.h>
@ -51,7 +52,7 @@ struct EGL_Texture
GLuint pbo[2];
int pboRIndex;
int pboWIndex;
volatile int pboCount;
_Atomic(int) pboCount;
size_t pboBufferSize;
void * pboMap[2];
GLsync pboSync[2];
@ -258,7 +259,7 @@ bool egl_texture_update(EGL_Texture * texture, const uint8_t * buffer)
{
/* NOTE: DO NOT use any gl commands here as streaming must be thread safe */
if (texture->pboCount == 2)
if (atomic_load_explicit(&texture->pboCount, memory_order_acquire) == 2)
return true;
/* update the GPU buffer */
@ -267,7 +268,8 @@ bool egl_texture_update(EGL_Texture * texture, const uint8_t * buffer)
if (++texture->pboWIndex == 2)
texture->pboWIndex = 0;
INTERLOCKED_INC(&texture->pboCount);
atomic_fetch_add_explicit(&texture->pboCount, 1, memory_order_release);
}
else
{
@ -290,7 +292,7 @@ bool egl_texture_update_from_frame(EGL_Texture * texture, const FrameBuffer * fr
if (!texture->streaming)
return false;
if (texture->pboCount == 2)
if (atomic_load_explicit(&texture->pboCount, memory_order_acquire) == 2)
return true;
framebuffer_read(
@ -307,8 +309,8 @@ bool egl_texture_update_from_frame(EGL_Texture * texture, const FrameBuffer * fr
if (++texture->pboWIndex == 2)
texture->pboWIndex = 0;
INTERLOCKED_INC(&texture->pboCount);
atomic_fetch_add_explicit(&texture->pboCount, 1, memory_order_release);
return true;
}
@ -317,12 +319,13 @@ enum EGL_TexStatus egl_texture_process(EGL_Texture * texture)
if (!texture->streaming)
return EGL_TEX_STATUS_OK;
if (texture->pboCount == 0)
int pboCount = atomic_load_explicit(&texture->pboCount, memory_order_acquire);
if (pboCount == 0)
return texture->ready ? EGL_TEX_STATUS_OK : EGL_TEX_STATUS_NOTREADY;
/* process any buffers that have not yet been flushed */
int pos = texture->pboRIndex;
for(int i = 0; i < texture->pboCount; ++i)
for(int i = 0; i < pboCount; ++i)
{
if (texture->pboSync[pos] == 0)
{
@ -356,6 +359,7 @@ enum EGL_TexStatus egl_texture_process(EGL_Texture * texture)
/* delete the sync and bind the buffer */
glDeleteSync(texture->pboSync[pos]);
texture->pboSync[pos] = 0;
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, texture->pbo[pos]);
/* update the textures */
@ -372,8 +376,8 @@ enum EGL_TexStatus egl_texture_process(EGL_Texture * texture)
/* advance the read index */
if (++texture->pboRIndex == 2)
texture->pboRIndex = 0;
INTERLOCKED_DEC(&texture->pboCount);
atomic_fetch_sub_explicit(&texture->pboCount, 1, memory_order_release);
texture->ready = true;
return EGL_TEX_STATUS_OK;