| 47 | } |
| 48 | |
| 49 | Status GlActiveSyncWait() { |
| 50 | GlSync sync; |
| 51 | RETURN_IF_ERROR(GlSync::NewSync(&sync)); |
| 52 | // Since creating a Sync object is itself a GL command it *must* be flushed. |
| 53 | // Otherwise glGetSynciv may never succeed. Perform a flush with |
| 54 | // glClientWaitSync call. |
| 55 | GLenum status = glClientWaitSync(sync.sync(), GL_SYNC_FLUSH_COMMANDS_BIT, |
| 56 | /* timeout ns = */ 0); |
| 57 | switch (status) { |
| 58 | case GL_TIMEOUT_EXPIRED: |
| 59 | break; |
| 60 | case GL_CONDITION_SATISFIED: |
| 61 | case GL_ALREADY_SIGNALED: |
| 62 | return OkStatus(); |
| 63 | case GL_WAIT_FAILED: |
| 64 | return GetOpenGlErrors(); |
| 65 | } |
| 66 | |
| 67 | // Start active loop. |
| 68 | GLint result = GL_UNSIGNALED; |
| 69 | while (true) { |
| 70 | glGetSynciv(sync.sync(), GL_SYNC_STATUS, sizeof(GLint), nullptr, &result); |
| 71 | if (result == GL_SIGNALED) { |
| 72 | return OkStatus(); |
| 73 | } |
| 74 | #ifdef __ARM_ACLE |
| 75 | // Try to save CPU power by yielding CPU to another thread. |
| 76 | __yield(); |
| 77 | #endif |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | Status GlShaderSync::NewSync(GlShaderSync* gl_sync) { |
| 82 | GlShaderSync sync; |
no test coverage detected