Mesa (master): mesa: fix OES_texture_float texture render target behavior

[Tapani Pälli]

Module: Mesa
Branch: master
Commit: e333035c47a6a4cc88f0f9ca2bced500538bebae
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=e333035c47a6a4cc88f0f9ca2bced500538bebae

Author: Tapani Pälli <tapani.palli at intel.com>
Date:   Thu Feb 12 14:33:53 2015 +0200

mesa: fix OES_texture_float texture render target behavior

Current implementation allowed usage of unsized type texture GL_FLOAT
and GL_HALF_FLOAT as a render target as this was 'expected behavior' by
WEBGL_oes_texture_float and is also allowed by the oes-texture-float
WebGL test. However this broke some ES3 conformance tests that do not
accept such behavior. Patch sets such an fbo incomplete as expected by
the ES3 conformance tests. Textures with sized types like RGBA32F will
still continue to work as render targets.

v2: code style cleanups (Ian Romanick, Matt Turner)

Signed-off-by: Tapani Pälli <tapani.palli at intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=88905
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
Cc: "10.5" <mesa-stable at lists.freedesktop.org>

---

 src/mesa/main/fbobject.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/mesa/main/fbobject.c b/src/mesa/main/fbobject.c
index dae9d4e..3053622 100644
--- a/src/mesa/main/fbobject.c
+++ b/src/mesa/main/fbobject.c
@@ -781,6 +781,18 @@ test_attachment_completeness(const struct gl_context *ctx, GLenum format,
             att->Complete = GL_FALSE;
             return;
          }
+
+         /* OES_texture_float allows creation and use of floating point
+          * textures with GL_FLOAT, GL_HALF_FLOAT but it does not allow
+          * these textures to be used as a render target, this is done via
+          * GL_EXT_color_buffer(_half)_float with set of new sized types.
+          */
+         if (_mesa_is_gles(ctx) && (texImage->TexObject->_IsFloat ||
+                                    texImage->TexObject->_IsHalfFloat)) {
+            att_incomplete("bad internal format");
+            att->Complete = GL_FALSE;
+            return;
+         }
       }
       else if (format == GL_DEPTH) {
          if (baseFormat == GL_DEPTH_COMPONENT) {