+ if (!swrast->TexelBuffer) {
+#ifdef _OPENMP
+ const GLint maxThreads = omp_get_max_threads();
+#else
+ const GLint maxThreads = 1;
+#endif
+
+ /* TexelBuffer is also global and normally shared by all SWspan
+ * instances; when running with multiple threads, create one per
+ * thread.
+ */
+ swrast->TexelBuffer =
+ (GLfloat *) MALLOC(ctx->Const.MaxTextureImageUnits * maxThreads *
+ MAX_WIDTH * 4 * sizeof(GLfloat));
+ if (!swrast->TexelBuffer) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "texture_combine");
+ return;
+ }
+ }
+
+ primary_rgba = (float4_array) malloc(span->end * 4 * sizeof(GLfloat));
+
+ if (!primary_rgba) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "texture_span");
+ return;
+ }
+