Both MESA_shader_framebuffer_fetch_non_coherent and the non-coherent variant of KHR_blend_equation_advanced will use this driver hook to request coherency between framebuffer reads and writes. This intentionally doesn't hook up glBlendBarrierMESA to the dispatch layer since the extension isn't exposed to applications yet, see [1] for more details.
[1] https://lists.freedesktop.org/archives/mesa-dev/2016-July/124028.html --- src/mesa/main/barrier.c | 14 ++++++++++++++ src/mesa/main/barrier.h | 3 +++ src/mesa/main/dd.h | 12 ++++++++++++ 3 files changed, 29 insertions(+) diff --git a/src/mesa/main/barrier.c b/src/mesa/main/barrier.c index 7ae8fc6..42a5e0f 100644 --- a/src/mesa/main/barrier.c +++ b/src/mesa/main/barrier.c @@ -108,3 +108,17 @@ _mesa_MemoryBarrierByRegion(GLbitfield barriers) ctx->Driver.MemoryBarrier(ctx, barriers); } } + +void GLAPIENTRY +_mesa_BlendBarrierMESA(void) +{ + GET_CURRENT_CONTEXT(ctx); + + if (!ctx->Extensions.MESA_shader_framebuffer_fetch_non_coherent) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glBlendBarrier(not supported)"); + return; + } + + ctx->Driver.BlendBarrier(ctx); +} diff --git a/src/mesa/main/barrier.h b/src/mesa/main/barrier.h index 8eee583..21dce90 100644 --- a/src/mesa/main/barrier.h +++ b/src/mesa/main/barrier.h @@ -47,4 +47,7 @@ _mesa_MemoryBarrier(GLbitfield barriers); void GLAPIENTRY _mesa_MemoryBarrierByRegion(GLbitfield barriers); +void GLAPIENTRY +_mesa_BlendBarrierMESA(void); + #endif /* BARRIER_H */ diff --git a/src/mesa/main/dd.h b/src/mesa/main/dd.h index 114cbd2..807cb2a 100644 --- a/src/mesa/main/dd.h +++ b/src/mesa/main/dd.h @@ -959,6 +959,18 @@ struct dd_function_table { /** @} */ /** + * GL_MESA_shader_framebuffer_fetch_non_coherent rendering barrier. + * + * On return from this function any framebuffer contents written by + * previous draw commands are guaranteed to be visible from subsequent + * fragment shader invocations using the + * MESA_shader_framebuffer_fetch_non_coherent interface. + */ + /** @{ */ + void (*BlendBarrier)(struct gl_context *ctx); + /** @} */ + + /** * \name GL_ARB_compute_shader interface */ /*@{*/ -- 2.9.0 _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
