ilikecats/stk-code_catmod
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Modelise Beer Lambert absorption for fog

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This commit is contained in:
Vincent Lejeune 2014-11-20 21:23:33 +01:00
parent 10ffb5411e
commit a78b889b05
5 changed files with 18 additions and 15 deletions
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6
data/shaders/fog.frag
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@ -15,7 +15,9 @@ void main()
vec4 xpos = getPosFromUVDepth(vec3(uv, z), InverseProjectionMatrix);
float dist = length(xpos.xyz);
vec3 fog = col * (1. - exp(- density * dist));
float factor = (1. - exp(- density * dist));
vec3 fog = col * factor;
FragColor = vec4(fog, 1.);
// fog is scattering component, factor is the beer lambert absorption
FragColor = vec4(fog, factor);
}

12
data/shaders/gaussian6h.comp
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@ -7,7 +7,7 @@ uniform float sigma;
layout (local_size_x = 8, local_size_y = 8) in;
shared vec3 local_src[8 + 2 * 6][8];
shared vec4 local_src[8 + 2 * 6][8];
void main()
{
@ -17,9 +17,9 @@ void main()
vec2 uv = iuv * pixel;
vec2 uv_p = (iuv + ivec2(6, 0)) * pixel;
local_src[x][y] = texture(source, uv_m).rgb;
local_src[x + 6][y] = texture(source, uv).rgb;
local_src[x + 12][y] = texture(source, uv_p).rgb;
local_src[x][y] = texture(source, uv_m);
local_src[x + 6][y] = texture(source, uv);
local_src[x + 12][y] = texture(source, uv_p);
barrier();
@ -27,7 +27,7 @@ void main()
g0 = 1.0 / (sqrt(2.0 * 3.14) * sigma);
g1 = exp(-0.5 / (sigma * sigma));
g2 = g1 * g1;
vec3 sum = local_src[x + 6][y] * g0;
vec4 sum = local_src[x + 6][y] * g0;
g0 *= g1;
g1 *= g2;
for (int i = 1; i < 6; i++) {
@ -37,5 +37,5 @@ void main()
g1 *= g2;
}
imageStore(dest, iuv, vec4(sum, 0.));
imageStore(dest, iuv, sum);
}

12
data/shaders/gaussian6v.comp
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@ -7,7 +7,7 @@ uniform float sigma;
layout (local_size_x = 8, local_size_y = 8) in;
shared vec3 local_src[8][8 + 2 * 6];
shared vec4 local_src[8][8 + 2 * 6];
void main()
{
@ -17,9 +17,9 @@ void main()
vec2 uv = iuv * pixel;
vec2 uv_p = (iuv + ivec2(0, 6)) * pixel;
local_src[x][y] = texture(source, uv_m).rgb;
local_src[x][y + 6] = texture(source, uv).rgb;
local_src[x][y + 12] = texture(source, uv_p).rgb;
local_src[x][y] = texture(source, uv_m);
local_src[x][y + 6] = texture(source, uv);
local_src[x][y + 12] = texture(source, uv_p);
barrier();
@ -27,7 +27,7 @@ void main()
g0 = 1.0 / (sqrt(2.0 * 3.14) * sigma);
g1 = exp(-0.5 / (sigma * sigma));
g2 = g1 * g1;
vec3 sum = local_src[x][y + 6] * g0;
vec4 sum = local_src[x][y + 6] * g0;
g0 *= g1;
g1 *= g2;
for (int i = 1; i < 6; i++) {
@ -37,5 +37,5 @@ void main()
g1 *= g2;
}
imageStore(dest, iuv, vec4(sum, 0.));
imageStore(dest, iuv, sum);
}

2
data/shaders/pointlightscatter.frag
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@ -42,5 +42,5 @@ void main()
xpos += stepsize * eyedir;
}
Fog = vec4(fogcol * fog, 1.);
Fog = vec4(fogcol * fog, 0.);
}

1
src/graphics/render_lighting.cpp
View File

@ -221,6 +221,7 @@ void IrrDriver::renderLightsScatter(unsigned pointlightcount)
glEnable(GL_BLEND);
// ***
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
getFBO(FBO_COLORS).Bind();
m_post_processing->renderPassThrough(getRenderTargetTexture(RTT_HALF1));
}