Stefan Dösinger : wined3d: Implement EXP and EXP2 fog in GLSL.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 66778ed9ec005248106f59e07f716e8e4317e1fc
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=66778ed9ec005248106f59e07f...

Author: Stefan Dösinger <stefan(a)codeweavers.com>
Date:   Fri Jan  2 01:59:13 2009 +0100

wined3d: Implement EXP and EXP2 fog in GLSL.

---

 dlls/wined3d/glsl_shader.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/dlls/wined3d/glsl_shader.c b/dlls/wined3d/glsl_shader.c
index d83eecb..f67fdd5 100644
--- a/dlls/wined3d/glsl_shader.c
+++ b/dlls/wined3d/glsl_shader.c
@@ -3872,10 +3872,16 @@ static GLuint shader_glsl_generate_pshader(IWineD3DPixelShader *iface, SHADER_BU
                 shader_addline(buffer, "%s.xyz = mix(gl_Fog.color.xyz, %s.xyz, Fog);\n", fragcolor, fragcolor);
                 break;
             case FOG_EXP:
-                FIXME("Implement EXP fog in glsl\n");
+                /* Fog = e^(-gl_Fog.density * gl_FogFragCoord) */
+                shader_addline(buffer, "float Fog = exp(-gl_Fog.density * gl_FogFragCoord);\n");
+                shader_addline(buffer, "Fog = clamp(Fog, 0.0, 1.0);");
+                shader_addline(buffer, "%s.xyz = mix(gl_Fog.color.xyz, %s.xyz, Fog);\n", fragcolor, fragcolor);
                 break;
             case FOG_EXP2:
-                FIXME("Implement EXP2 fog in glsl\n");
+                /* Fog = e^(-(gl_Fog.density * gl_FogFragCoord)^2) */
+                shader_addline(buffer, "float Fog = exp(-gl_Fog.density * gl_Fog.density * gl_FogFragCoord * gl_FogFragCoord);\n");
+                shader_addline(buffer, "Fog = clamp(Fog, 0.0, 1.0);");
+                shader_addline(buffer, "%s.xyz = mix(gl_Fog.color.xyz, %s.xyz, Fog);\n", fragcolor, fragcolor);
                 break;
         }
     }