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mesa: don't pass Infs to the shader via gl_Fog.scale

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This is for GLSL versions where Infs are undefined.

It also helps piglit/glsl-fs-fogscale that breaks when we move the fragment
shader code into the vertex shader across interpolation.

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Acked-by: Jesse Natalie on IRC
Acked-by: Erico Nunes on Gitlab
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25391>
This commit is contained in:
Marek Olšák
2023-09-20 09:57:03 -04:00
committed by Marge Bot
parent 91da6be8ce
commit 35ae5dce39
3 changed files with 20 additions and 2 deletions
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4
src/gallium/drivers/d3d12/ci/d3d12-quick_gl.txt
View File

@@ -410,3 +410,7 @@ spec@nv_copy_depth_to_color@nv_copy_depth_to_color 1 0x223344ff,Fail
spec@nv_copy_depth_to_color@nv_copy_depth_to_color 1 0x76356278,Fail
spec@nv_copy_image@nv_copy_image-formats,Crash
wgl@wgl-multi-context-single-window,Fail
# remove this after https://gitlab.freedesktop.org/mesa/piglit/-/merge_requests/843
# is merged and piglit is updated
spec@arb_vertex_program@arb_vertex_program-property-bindings,Fail

4
src/gallium/drivers/lima/ci/lima-fails.txt
View File

@@ -672,3 +672,7 @@ spec@ext_framebuffer_multisample@renderbufferstorage-samples,Fail
# New CTS failures in 1.3.6.3
wayland-dEQP-EGL.functional.fence_sync.valid.egl_fence_persistent_buffer,Crash
x11-dEQP-EGL.functional.fence_sync.valid.egl_fence_persistent_buffer,Crash
# remove this after https://gitlab.freedesktop.org/mesa/piglit/-/merge_requests/843
# is merged and piglit is updated
spec@glsl-1.10@execution@glsl-1.10-built-in-uniform-state,Fail

14
src/mesa/program/prog_statevars.c
View File

@@ -308,12 +308,22 @@ fetch_state(struct gl_context *ctx, const gl_state_index16 state[],
else
COPY_4V(value, ctx->Fog.ColorUnclamped);
return;
case STATE_FOG_PARAMS:
case STATE_FOG_PARAMS: {
float scale = 1.0f / (ctx->Fog.End - ctx->Fog.Start);
/* Pass +-FLT_MAX/2 to the shader instead of +-Inf because Infs have
* undefined behavior without GLSL 4.10 or GL_ARB_shader_precision
* enabled. Infs also have undefined behavior with Shader Model 3.
*
* The division by 2 makes it less likely that ALU ops will generate
* Inf.
*/
scale = CLAMP(scale, FLT_MIN / 2, FLT_MAX / 2);
value[0] = ctx->Fog.Density;
value[1] = ctx->Fog.Start;
value[2] = ctx->Fog.End;
value[3] = 1.0f / (ctx->Fog.End - ctx->Fog.Start);
value[3] = scale;
return;
}
case STATE_CLIPPLANE:
{
const GLuint plane = (GLuint) state[1];