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OpenGL2: "Fix" cg_shadows 4.

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This commit is contained in:
SmileTheory 2017-07-14 16:15:02 -07:00
parent 6a77f4e363
commit 6f1712dafe
5 changed files with 29 additions and 50 deletions
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44
code/renderergl2/glsl/pshadow_fp.glsl
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@ -8,12 +8,6 @@ uniform float u_LightRadius;
varying vec3 var_Position;
varying vec3 var_Normal;
float sampleDistMap(sampler2D texMap, vec2 uv, float scale)
{
vec3 distv = texture2D(texMap, uv).xyz;
return dot(distv, vec3(1.0 / (256.0 * 256.0), 1.0 / 256.0, 1.0)) * scale;
}
void main()
{
vec3 lightToPos = var_Position - u_LightOrigin.xyz;
@ -57,42 +51,28 @@ void main()
#endif
intensity *= fade;
#if defined(USE_PCF)
float part;
dist = sampleDistMap(u_ShadowMap, st + vec2(-1.0/512.0, -1.0/512.0), u_LightRadius);
part = max(sign(lightDist - dist), 0.0);
#if defined(USE_PCF)
part = float(texture2D(u_ShadowMap, st + vec2(-1.0/512.0, -1.0/512.0)).r != 1.0);
part += float(texture2D(u_ShadowMap, st + vec2( 1.0/512.0, -1.0/512.0)).r != 1.0);
part += float(texture2D(u_ShadowMap, st + vec2(-1.0/512.0, 1.0/512.0)).r != 1.0);
part += float(texture2D(u_ShadowMap, st + vec2( 1.0/512.0, 1.0/512.0)).r != 1.0);
#else
part = float(texture2D(u_ShadowMap, st).r != 1.0);
#endif
dist = sampleDistMap(u_ShadowMap, st + vec2( 1.0/512.0, -1.0/512.0), u_LightRadius);
part += max(sign(lightDist - dist), 0.0);
dist = sampleDistMap(u_ShadowMap, st + vec2(-1.0/512.0, 1.0/512.0), u_LightRadius);
part += max(sign(lightDist - dist), 0.0);
dist = sampleDistMap(u_ShadowMap, st + vec2( 1.0/512.0, 1.0/512.0), u_LightRadius);
part += max(sign(lightDist - dist), 0.0);
#if defined(USE_DISCARD)
if (part <= 0.0)
{
discard;
}
#endif
#if defined(USE_PCF)
intensity *= part * 0.25;
#else
dist = sampleDistMap(u_ShadowMap, st, u_LightRadius);
#if defined(USE_DISCARD)
if (lightDist - dist <= 0.0)
{
discard;
}
#endif
intensity *= max(sign(lightDist - dist), 0.0);
intensity *= part;
#endif
gl_FragColor.rgb = vec3(0);
gl_FragColor.a = clamp(intensity, 0.0, 0.75);
}