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Corrected lighting model for transparent surfaces. Reflections and specular are no longer masked by the alpha channel.

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This commit is contained in:
Kearwood Gilbert
2013-05-02 13:32:36 -07:00
parent 12842a0184
commit 30f39ea19f
9 changed files with 61 additions and 45 deletions
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88
KREngine/kraken_standard_assets_ios/Shaders/ObjectShader.fsh
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@@ -322,9 +322,35 @@ void main()
// -------------------- Add diffuse light --------------------
gl_FragColor += diffuseMaterial * vec4(material_diffuse, 1.0) * vec4(vec3(lamberFactor), 1.0);
#endif
// -------------------- Switch to Pre-multiplied Alpha and Apply material_alpha --------------------
#if ALPHA_BLEND == 1
gl_FragColor.a = gl_FragColor.a * material_alpha; // Apply material_alpha
gl_FragColor.rgb *= gl_FragColor.a; // Switch to pre-multiplied alpha
#endif
// -------------------- Add specular light --------------------
// Additive, not masked against diffuse alpha
#if ENABLE_SPECULAR == 1
#if HAS_SPEC_MAP == 1 && ENABLE_PER_PIXEL == 1
gl_FragColor.rgb += material_specular * vec3(texture2D(specularTexture, spec_uv)) * specularFactor;
#else
gl_FragColor.rgb += material_specular * specularFactor;
#endif
#endif
// -------------------- Multiply light map --------------------
#if HAS_LIGHT_MAP == 1
mediump vec3 lightMapColor = vec3(texture2D(lightmapTexture, lightmap_uv));
//gl_FragColor = vec4(gl_FragColor.r * lightMapColor.r, gl_FragColor.g * lightMapColor.g, gl_FragColor.b * lightMapColor.b, gl_FragColor.a);
gl_FragColor.rgb *= lightMapColor;
#endif
// -------------------- Add reflected light --------------------
#if HAS_REFLECTION_CUBE_MAP == 1
// -------------------- Add reflected light --------------------
// Reflected light is additive and not modulated by the light map
#if HAS_NORMAL_MAP == 1
// Calculate reflection vector as I - 2.0 * dot(N, I) * N
mediump vec3 incidenceVec = -normalize(eyeVec);
@@ -338,43 +364,33 @@ void main()
#endif
#endif
// -------------------- Add specular light --------------------
#if ENABLE_SPECULAR == 1
#if HAS_SPEC_MAP == 1 && ENABLE_PER_PIXEL == 1
gl_FragColor += vec4(material_specular * vec3(texture2D(specularTexture, spec_uv)) * specularFactor, 0.0);
#else
gl_FragColor += vec4(material_specular * specularFactor, 0.0);
// -------------------- Apply Fog --------------------
#if FOG_TYPE == 1 || FOG_TYPE == 2 || FOG_TYPE == 3
#if FOG_TYPE == 1
// Linear fog
lowp float fog_alpha = clamp((fog_far - gl_FragCoord.z / gl_FragCoord.w) * fog_scale, 0.0, 1.0);
#endif
#if FOG_TYPE == 2
// Exponential fog
mediump float fog_z = gl_FragCoord.z / gl_FragCoord.w - fog_near;
lowp float fog_alpha = clamp(exp2(fog_density_premultiplied_exponential * fog_z), 0.0, 1.0);
#endif
#if FOG_TYPE == 3
// Exponential squared fog
mediump float fog_z = max(gl_FragCoord.z / gl_FragCoord.w - fog_near, 0.0);
lowp float fog_alpha = clamp(exp2(fog_density_premultiplied_squared * fog_z * fog_z), 0.0, 1.0);
#endif
#if ALPHA_BLEND == 1
gl_FragColor.rgb = mix(fog_color.rgb * gl_FragColor.a, gl_FragColor.rgb, fog_alpha);
#else
gl_FragColor.rgb = mix(fog_color.rgb, gl_FragColor.rgb, fog_alpha);
#endif
#endif
#if ALPHA_BLEND == 1
gl_FragColor.a = gl_FragColor.a * material_alpha;
#endif
// -------------------- Multiply light map --------------------
#if HAS_LIGHT_MAP == 1
mediump vec3 lightMapColor = vec3(texture2D(lightmapTexture, lightmap_uv));
gl_FragColor = vec4(gl_FragColor.r * lightMapColor.r, gl_FragColor.g * lightMapColor.g, gl_FragColor.b * lightMapColor.b, gl_FragColor.a);
#endif
// -------------------- Apply Fog --------------------
#if FOG_TYPE == 1
// Linear fog
gl_FragColor.rgb = mix(fog_color.rgb, gl_FragColor.rgb, clamp((fog_far - gl_FragCoord.z / gl_FragCoord.w) * fog_scale, 0.0, 1.0));
#endif
#if FOG_TYPE == 2
// Exponential fog
mediump float fog_z = gl_FragCoord.z / gl_FragCoord.w - fog_near;
gl_FragColor.rgb = mix(fog_color.rgb, gl_FragColor.rgb, clamp(exp2(fog_density_premultiplied_exponential * fog_z), 0.0, 1.0));
#endif
#if FOG_TYPE == 3
// Exponential squared fog
mediump float fog_z = max(gl_FragCoord.z / gl_FragCoord.w - fog_near, 0.0);
gl_FragColor.rgb = mix(fog_color.rgb, gl_FragColor.rgb, clamp(exp2(fog_density_premultiplied_squared * fog_z * fog_z), 0.0, 1.0));
#endif
#endif
}