mesa: allow mutable buffer textures to back GL ES images

Since there is no way to create immutable texture buffers in GL ES,
mutable buffer textures are allowed to back images. See issue 7 of the
GL_OES_texture_buffer specification.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>

diff --git a/src/mesa/main/shaderimage.c b/src/mesa/main/shaderimage.c
index fd5934f939f52e58a3b462f1836ae6e2ea56c1c5..90643c4ed6d8a6d96dd585d57a7174508e8ad7c8 100644 (file)
--- a/src/mesa/main/shaderimage.c
+++ b/src/mesa/main/shaderimage.c
@@ -583,8 +583,13 @@ _mesa_BindImageTexture(GLuint unit, GLuint texture, GLint level,
        *
        * "An INVALID_OPERATION error is generated if texture is not the name
        *  of an immutable texture object."
+       *
+       * However note that issue 7 of the GL_OES_texture_buffer spec
+       * recognizes that there is no way to create immutable buffer textures,
+       * so those are excluded from this requirement.
        */
-      if (_mesa_is_gles(ctx) && !t->Immutable) {
+      if (_mesa_is_gles(ctx) && !t->Immutable &&
+          t->Target != GL_TEXTURE_BUFFER) {
          _mesa_error(ctx, GL_INVALID_OPERATION,
                      "glBindImageTexture(!immutable)");
          return;