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mesa: Accept GL_BACK in get_fb0_attachment with ARB_ES3_1_compatibility.

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According to the ARB_ES3_1_compatibility specification,
glGetFramebufferAttachmentParameteriv is supposed to accept BACK,
and it behaves exactly like BACK_LEFT.

Fixes a GL error in GFXBench 5 Aztec Ruins.

Cc: "17.3 17.2" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
(cherry picked from commit 4f538c3f99)
This commit is contained in:
Kenneth Graunke 2017-10-26 11:44:09 -07:00 • committed by Andres Gomez
parent 71ea414782
commit 67fc6d43bd
1 changed files with 9 additions and 0 deletions
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9
src/mesa/main/fbobject.c
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@ -330,6 +330,15 @@ get_fb0_attachment(struct gl_context *ctx, struct gl_framebuffer *fb,
return &fb->Attachment[BUFFER_BACK_LEFT];
case GL_BACK_RIGHT:
return &fb->Attachment[BUFFER_BACK_RIGHT];
case GL_BACK:
/* The ARB_ES3_1_compatibility spec says:
*
* "Since this command can only query a single framebuffer
* attachment, BACK is equivalent to BACK_LEFT."
*/
if (ctx->Extensions.ARB_ES3_1_compatibility)
return &fb->Attachment[BUFFER_BACK_LEFT];
return NULL;
case GL_AUX0:
if (fb->Visual.numAuxBuffers == 1) {
return &fb->Attachment[BUFFER_AUX0];