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 <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=88905
Reviewed-by: Ian Romanick <[email protected]>
Cc: "10.5" <[email protected]>
(cherry picked from commit e333035c47a6a4cc88f0f9ca2bced500538bebae)

1 files changed, 12 insertions, 0 deletions

diff --git a/src/mesa/main/fbobject.c b/src/mesa/main/fbobject.c
index 3305151ff2c..79390abf8f9 100644
--- a/src/mesa/main/fbobject.c
+++ b/src/mesa/main/fbobject.c
@@ -780,6 +780,18 @@ 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) {