fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2025-12-21 20:10:14 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

mesa: Clamp some depth values in glClearBufferfv

Browse source 
OpenGL 3.0 spec, section 4.2.3 "Clearing the Buffers":

   If buffer is DEPTH, drawbuffer must be zero, and value points to the
   single depth value to clear the depth buffer to. Clamping and type
   conversion for fixed-point depth buffers are performed in the same
   fashion as for ClearDepth.

Enables iris to pass the clearbuffer-depth piglit test.

v2. Add spec citation. (Eric Anholt)
v3. Don't clamp floating point formats. (Eric Anholt)

Cc: mesa-stable
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7410>
This commit is contained in:
Nanley Chery 2020-11-02 09:02:42 -08:00 • committed by Marge Bot
parent fda015023a
commit 1bf539b3a2
1 changed files with 15 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
src/mesa/main/clear.c
View file

@ -30,6 +30,7 @@
#include "glformats.h"
#include "glheader.h" #include "glheader.h"
#include "clear.h" #include "clear.h"
#include "context.h" #include "context.h"
@ -589,7 +590,20 @@ clear_bufferfv(struct gl_context *ctx, GLenum buffer, GLint drawbuffer,
* hook instead. * hook instead.
*/ */
const GLclampd clearSave = ctx->Depth.Clear; const GLclampd clearSave = ctx->Depth.Clear;
ctx->Depth.Clear = *value;
/* Page 263 (page 279 of the PDF) of the OpenGL 3.0 spec says:
*
* "If buffer is DEPTH, drawbuffer must be zero, and value points
* to the single depth value to clear the depth buffer to.
* Clamping and type conversion for fixed-point depth buffers are
* performed in the same fashion as for ClearDepth."
*/
const struct gl_renderbuffer *rb =
ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
const bool is_float_depth =
_mesa_has_depth_float_channel(rb->InternalFormat);
ctx->Depth.Clear = is_float_depth ? *value : SATURATE(*value);
ctx->Driver.Clear(ctx, BUFFER_BIT_DEPTH); ctx->Driver.Clear(ctx, BUFFER_BIT_DEPTH);
ctx->Depth.Clear = clearSave; ctx->Depth.Clear = clearSave;
} }