Mesa (master): mesa: allow GL_UNSIGNED_BYTE type for SNORM reads

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Module: Mesa
Branch: master
Commit: a72dbc461bdb7714656e62cd8f4b00a404c2e6e0
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=a72dbc461bdb7714656e62cd8f4b00a404c2e6e0

Author: Tapani Pälli <tapani.palli at intel.com>
Date:   Mon Aug 27 14:40:41 2018 +0300

mesa: allow GL_UNSIGNED_BYTE type for SNORM reads

OpenGL ES spec states:
   "For normalized fixed-point rendering surfaces, the combination format
    RGBA and type UNSIGNED_BYTE is accepted."

This fixes following failing VK-GL-CTS tests:

   KHR-GLES3.packed_pixels.pbo_rectangle.rgba8_snorm
   KHR-GLES3.packed_pixels.rectangle.rgba8_snorm
   KHR-GLES3.packed_pixels.varied_rectangle.rgba8_snorm

Signed-off-by: Tapani Pälli <tapani.palli at intel.com>
https://bugs.freedesktop.org/show_bug.cgi?id=107658
Cc: mesa-stable at lists.freedesktop.org
Reviewed-by: Marek Olšák <marek.olsak at amd.com>
Tested-by: Andres Gomez <agomez at igalia.com>

---

 src/mesa/main/readpix.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/mesa/main/readpix.c b/src/mesa/main/readpix.c
index 2cbb578a37..556c860d39 100644
--- a/src/mesa/main/readpix.c
+++ b/src/mesa/main/readpix.c
@@ -958,6 +958,15 @@ read_pixels_es3_error_check(struct gl_context *ctx, GLenum format, GLenum type,
                return GL_NO_ERROR;
          }
       }
+      if (type == GL_UNSIGNED_BYTE) {
+         switch (internalFormat) {
+         case GL_R8_SNORM:
+         case GL_RG8_SNORM:
+         case GL_RGBA8_SNORM:
+            if (_mesa_has_EXT_render_snorm(ctx))
+               return GL_NO_ERROR;
+         }
+      }
       break;
    case GL_BGRA:
       /* GL_EXT_read_format_bgra */