mesa: Move shader memory barrier functions into barrier.c.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

1 files changed, 51 insertions, 0 deletions

diff --git a/src/mesa/main/barrier.c b/src/mesa/main/barrier.c
index beb48fb..7ae8fc6 100644
--- a/src/mesa/main/barrier.c
+++ b/src/mesa/main/barrier.c
@@ -57,3 +57,54 @@ _mesa_TextureBarrierNV(void)
 
    ctx->Driver.TextureBarrier(ctx);
 }
+
+void GLAPIENTRY
+_mesa_MemoryBarrier(GLbitfield barriers)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   if (ctx->Driver.MemoryBarrier)
+      ctx->Driver.MemoryBarrier(ctx, barriers);
+}
+
+void GLAPIENTRY
+_mesa_MemoryBarrierByRegion(GLbitfield barriers)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   GLbitfield all_allowed_bits = GL_ATOMIC_COUNTER_BARRIER_BIT |
+                                 GL_FRAMEBUFFER_BARRIER_BIT |
+                                 GL_SHADER_IMAGE_ACCESS_BARRIER_BIT |
+                                 GL_SHADER_STORAGE_BARRIER_BIT |
+                                 GL_TEXTURE_FETCH_BARRIER_BIT |
+                                 GL_UNIFORM_BARRIER_BIT;
+
+   if (ctx->Driver.MemoryBarrier) {
+      /* From section 7.11.2 of the OpenGL ES 3.1 specification:
+       *
+       *    "When barriers is ALL_BARRIER_BITS, shader memory accesses will be
+       *     synchronized relative to all these barrier bits, but not to other
+       *     barrier bits specific to MemoryBarrier."
+       *
+       * That is, if barriers is the special value GL_ALL_BARRIER_BITS, then all
+       * barriers allowed by glMemoryBarrierByRegion should be activated."
+       */
+      if (barriers == GL_ALL_BARRIER_BITS) {
+         ctx->Driver.MemoryBarrier(ctx, all_allowed_bits);
+         return;
+      }
+
+      /* From section 7.11.2 of the OpenGL ES 3.1 specification:
+       *
+       *    "An INVALID_VALUE error is generated if barriers is not the special
+       *     value ALL_BARRIER_BITS, and has any bits set other than those
+       *     described above."
+       */
+      if ((barriers & ~all_allowed_bits) != 0) {
+         _mesa_error(ctx, GL_INVALID_VALUE,
+                     "glMemoryBarrierByRegion(unsupported barrier bit");
+      }
+
+      ctx->Driver.MemoryBarrier(ctx, barriers);
+   }
+}