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fix depth computation in water shader

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Miloslav Číž 2017-09-22 21:03:09 +02:00
parent 8df79625e8
commit f274bc84cc
1 changed files with 6 additions and 8 deletions
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14
files/shaders/water_fragment.glsl
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@ -31,7 +31,7 @@ const vec3 SUN_EXT = vec3(0.45, 0.55, 0.68); //sunlight extinction
const float SPEC_HARDNESS = 256.0; // specular highlights hardness
const float REFLECTION_BUMP_SUPPRESS_DEPTH = 150; // at what water depth bump map will be supressed for reflections (prevents artifacts at shores)
const float REFLECTION_BUMP_SUPPRESS_DEPTH = 0.03; // at what water depth bump map will be supressed for reflections (prevents artifacts at shores)
const vec2 WIND_DIR = vec2(0.5f, -0.8f);
const float WIND_SPEED = 0.2f;
@ -76,7 +76,7 @@ uniform float near;
uniform float far;
uniform vec3 nodePosition;
float transformDepth(float depth) // helper for transforming water depth
float linearizeDepth(float depth) // helper for transforming water depth
{
float z_n = 2.0 * depth - 1.0;
depth = 2.0 * near * far / (far + near - z_n * (far - near));
@ -157,12 +157,11 @@ void main(void)
fresnel = clamp(fresnel, 0.0, 1.0);
#if REFRACTION
float realWaterDepth = transformDepth(texture2D(refractionDepthMap, screenCoords).x);
float shore = clamp(realWaterDepth / REFLECTION_BUMP_SUPPRESS_DEPTH,0,1);
float realWaterDepth = linearizeDepth(texture2D(refractionDepthMap, screenCoords).x);
float shore = clamp(realWaterDepth / (REFLECTION_BUMP_SUPPRESS_DEPTH * (far - near)),0,1);
#else
float shore = 1.0;
#endif
// reflection
vec3 reflection = texture2D(reflectionMap, screenCoords+(normal.xy*REFL_BUMP*shore)).rgb;
@ -181,8 +180,7 @@ void main(void)
waterColor = waterColor * length(gl_LightModel.ambient.xyz);
#if REFRACTION
float refractionDepth = transformDepth(texture2D(refractionDepthMap, screenCoords-(normal.xy*REFR_BUMP)).x);
float waterDepth = refractionDepth - depthPassthrough;
float waterDepth = linearizeDepth(texture2D(refractionDepthMap, screenCoords-(normal.xy*REFR_BUMP)).x);
if (cameraPos.z > 0.0)
refraction = mix(refraction, waterColor, clamp(waterDepth/VISIBILITY, 0.0, 1.0));
@ -200,5 +198,5 @@ void main(void)
gl_FragData[0].w = 1.0;
#else
gl_FragData[0].w = clamp(fresnel*2.0 + specular, 0.0, 1.0);
#endif
#endi
}