swrast: fix delayed texel buffer allocation regression for OpenMP

Commit 9119269ca14ed42b51c7d8e2e662500311b29fa3 moved the texel
buffer allocation to _swrast_texture_span(), however, when compiled
with OpenMP support this code already runs multi-threaded so a
critical section is required to prevent multiple allocations and
rendering errors.

Cc: "10.0" <[email protected]>
Reviewed-by: Brian Paul <[email protected]>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/mesa/swrast/s_texcombine.c b/src/mesa/swrast/s_texcombine.c
index 7e07f4f8a34..297491ed5b2 100644
--- a/src/mesa/swrast/s_texcombine.c
+++ b/src/mesa/swrast/s_texcombine.c
@@ -602,6 +602,14 @@ _swrast_texture_span( struct gl_context *ctx, SWspan *span )
    if (!swrast->TexelBuffer) {
 #ifdef _OPENMP
       const GLint maxThreads = omp_get_max_threads();
+
+      /* TexelBuffer memory allocation needs to be done in a critical section
+       * as this code runs in a parallel loop.
+       * When entering the section, first check if TexelBuffer has been
+       * initialized already by another thread while this thread was waiting.
+       */
+      #pragma omp critical
+      if (!swrast->TexelBuffer) {
 #else
       const GLint maxThreads = 1;
 #endif
@@ -613,6 +621,10 @@ _swrast_texture_span( struct gl_context *ctx, SWspan *span )
       swrast->TexelBuffer =
 	 malloc(ctx->Const.FragmentProgram.MaxTextureImageUnits * maxThreads *
 			    SWRAST_MAX_WIDTH * 4 * sizeof(GLfloat));
+#ifdef _OPENMP
+      } /* critical section */
+#endif
+
       if (!swrast->TexelBuffer) {
 	 _mesa_error(ctx, GL_OUT_OF_MEMORY, "texture_combine");
 	 return;