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wined3d: Introduce a separate function for generating the fixed function fog GLSL code.

This commit is contained in:
Henri Verbeet 2012-11-08 23:29:16 +01:00 committed by Alexandre Julliard
parent 1b9dcb16ce
commit f6d05fbae6
1 changed files with 33 additions and 29 deletions
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62
dlls/wined3d/glsl_shader.c
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@ -4360,6 +4360,36 @@ static GLhandleARB generate_param_reorder_function(struct wined3d_shader_buffer
return ret;
}
static void shader_glsl_generate_fog_code(struct wined3d_shader_buffer *buffer, enum fogmode mode)
{
switch (mode)
{
case FOG_OFF:
return;
case FOG_LINEAR:
/* Fog = (gl_Fog.end - gl_FogFragCoord) / (gl_Fog.end - gl_Fog.start) */
shader_addline(buffer, "float Fog = (gl_Fog.end - gl_FogFragCoord) / (gl_Fog.end - gl_Fog.start);\n");
break;
case FOG_EXP:
/* Fog = e^-(gl_Fog.density * gl_FogFragCoord) */
shader_addline(buffer, "float Fog = exp(-gl_Fog.density * gl_FogFragCoord);\n");
break;
case FOG_EXP2:
/* 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");
break;
default:
ERR("Invalid fog mode %#x.\n", mode);
return;
}
shader_addline(buffer, "gl_FragData[0].xyz = mix(gl_Fog.color.xyz, gl_FragData[0].xyz, clamp(Fog, 0.0, 1.0));\n");
}
/* GL locking is done by the caller */
static void hardcode_local_constants(const struct wined3d_shader *shader,
const struct wined3d_gl_info *gl_info, GLhandleARB programId, const char *prefix)
@ -4435,36 +4465,10 @@ static GLuint shader_glsl_generate_pshader(const struct wined3d_context *context
shader_addline(buffer, "gl_FragData[0].xyz = mix(tmp0.xyz, tmp1.xyz, vec3(srgb_compare));\n");
shader_addline(buffer, "gl_FragData[0] = clamp(gl_FragData[0], 0.0, 1.0);\n");
}
/* Pixel shader < 3.0 do not replace the fog stage.
* This implements linear fog computation and blending.
* TODO: non linear fog
* NOTE: gl_Fog.start and gl_Fog.end don't hold fog start s and end e but
* -1/(e-s) and e/(e-s) respectively.
*/
/* SM < 3 does not replace the fog stage. */
if (reg_maps->shader_version.major < 3)
{
switch(args->fog) {
case FOG_OFF: break;
case FOG_LINEAR:
shader_addline(buffer, "float fogstart = -1.0 / (gl_Fog.end - gl_Fog.start);\n");
shader_addline(buffer, "float fogend = gl_Fog.end * -fogstart;\n");
shader_addline(buffer, "float Fog = clamp(gl_FogFragCoord * fogstart + fogend, 0.0, 1.0);\n");
shader_addline(buffer, "gl_FragData[0].xyz = mix(gl_Fog.color.xyz, gl_FragData[0].xyz, Fog);\n");
break;
case FOG_EXP:
/* 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);\n");
shader_addline(buffer, "gl_FragData[0].xyz = mix(gl_Fog.color.xyz, gl_FragData[0].xyz, Fog);\n");
break;
case FOG_EXP2:
/* 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);\n");
shader_addline(buffer, "gl_FragData[0].xyz = mix(gl_Fog.color.xyz, gl_FragData[0].xyz, Fog);\n");
break;
}
}
shader_glsl_generate_fog_code(buffer, args->fog);
shader_addline(buffer, "}\n");