Screen space ambient occlusion effect
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Frederic Bouvier
parent
c5732c38ba
commit
140263d611
5 changed files with 175 additions and 0 deletions
10
Effects/ssao-blur-1.eff
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10
Effects/ssao-blur-1.eff
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<?xml version="1.0" encoding="utf-8"?>
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<PropertyList>
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<name>Effects/ssao-blur-1</name>
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<inherits-from>Effects/blur</inherits-from>
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<parameters>
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<blurOffset_x>4.0</blurOffset_x>
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<blurOffset_y>0.0</blurOffset_y>
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<buffer-name>ao-1</buffer-name>
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</parameters>
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</PropertyList>
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10
Effects/ssao-blur-2.eff
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10
Effects/ssao-blur-2.eff
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<?xml version="1.0" encoding="utf-8"?>
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<PropertyList>
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<name>Effects/ssao-blur-2</name>
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<inherits-from>Effects/blur</inherits-from>
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<parameters>
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<blurOffset_x>0.0</blurOffset_x>
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<blurOffset_y>4.0</blurOffset_y>
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<buffer-name>ao-2</buffer-name>
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</parameters>
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</PropertyList>
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84
Effects/ssao.eff
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84
Effects/ssao.eff
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<?xml version="1.0" encoding="utf-8"?>
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<PropertyList>
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<name>Effects/ssao</name>
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<parameters>
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<g_scale type="float">1.0</g_scale>
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<g_bias type="float">0.0</g_bias>
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<g_intensity type="float">7.0</g_intensity>
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<g_sample_rad type="float">0.03</g_sample_rad>
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<random_size type="float">800.0</random_size>
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</parameters>
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<technique n="11">
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<pass>
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<texture-unit>
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<unit>0</unit>
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<type>buffer</type>
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<name>depth</name>
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</texture-unit>
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<texture-unit>
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<unit>1</unit>
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<type>buffer</type>
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<name>normal</name>
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</texture-unit>
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<texture-unit>
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<unit>2</unit>
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<type>buffer</type>
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<name>spec-emis</name>
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</texture-unit>
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<texture-unit>
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<unit>3</unit>
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<type>noise</type>
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</texture-unit>
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<program>
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<vertex-shader>Shaders/ssao.vert</vertex-shader>
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<fragment-shader>Shaders/ssao.frag</fragment-shader>
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<fragment-shader>Shaders/gbuffer-functions.frag</fragment-shader>
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</program>
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<uniform>
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<name>depth_tex</name>
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<type>sampler-2d</type>
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<value type="int">0</value>
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</uniform>
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<uniform>
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<name>normal_tex</name>
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<type>sampler-2d</type>
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<value type="int">1</value>
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</uniform>
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<uniform>
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<name>spec_emis_tex</name>
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<type>sampler-2d</type>
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<value type="int">2</value>
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</uniform>
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<uniform>
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<name>noise_tex</name>
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<type>sampler-2d</type>
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<value type="int">3</value>
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</uniform>
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<uniform>
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<name>g_scale</name>
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<type>float</type>
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<value><use>g_scale</use></value>
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</uniform>
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<uniform>
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<name>g_bias</name>
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<type>float</type>
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<value><use>g_bias</use></value>
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</uniform>
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<uniform>
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<name>g_intensity</name>
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<type>float</type>
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<value><use>g_intensity</use></value>
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</uniform>
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<uniform>
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<name>g_sample_rad</name>
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<type>float</type>
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<value><use>g_sample_rad</use></value>
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</uniform>
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<uniform>
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<name>random_size</name>
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<type>float</type>
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<value><use>random_size</use></value>
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</uniform>
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</pass>
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</technique>
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</PropertyList>
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64
Shaders/ssao.frag
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64
Shaders/ssao.frag
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#version 120
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#extension GL_EXT_gpu_shader4 : enable
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uniform sampler2D normal_tex;
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uniform sampler2D depth_tex;
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uniform sampler2D spec_emis_tex;
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uniform sampler3D noise_tex;
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uniform vec2 fg_BufferSize;
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uniform vec3 fg_Planes;
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uniform vec4 fg_du;
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uniform vec4 fg_dv;
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uniform float g_scale;
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uniform float g_bias;
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uniform float g_intensity;
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uniform float g_sample_rad;
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uniform float random_size;
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uniform unsigned int osg_FrameNumber;
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varying vec4 ray;
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const vec2 v[4] = vec2[](vec2(1.0,0.0),vec2(-1.0,0.0),vec2(0.0,1.0),vec2(0.0,-1.0));
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vec3 position( vec3 viewDir, vec2 coords, sampler2D depth_tex );
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vec3 normal_decode(vec2 enc);
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vec2 getRandom( in vec2 uv ) {
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unsigned int level = osg_FrameNumber - ((osg_FrameNumber / 64U) * 64U);
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return normalize( texture3D( noise_tex, vec3(uv*50.0, float(level) / 64.0) ).xy * 0.14 - 0.07 );
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}
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vec3 getPosition(in vec2 uv, in vec2 uv0, in vec4 ray0) {
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vec2 duv = uv - uv0;
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vec4 ray = ray0 + fg_du * duv.x + fg_dv * duv.y;
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vec3 viewDir = normalize( ray.xyz );
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return position(viewDir, uv, depth_tex);
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}
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float doAmbientOcclusion(in vec2 tcoord, in vec2 uv, in vec3 p, in vec3 cnorm, in vec4 ray) {
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vec3 diff = getPosition(tcoord+uv,tcoord,ray)-p;
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float d = length(diff);
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vec3 v = diff / d;
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d *= g_scale;
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return max(0.0, dot( cnorm,v ) - g_bias) * (1.0/(1.0+d)) * g_intensity;
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}
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void main() {
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vec2 coords = gl_TexCoord[0].xy;
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float initialized = texture2D( spec_emis_tex, coords ).a;
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if ( initialized < 0.1 )
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discard;
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vec3 normal = normal_decode(texture2D( normal_tex, coords ).rg);
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vec3 viewDir = normalize(ray.xyz);
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vec3 pos = position(viewDir, coords, depth_tex);
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vec2 rand = getRandom(coords);
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float ao = 0.0;
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float rad = g_sample_rad;
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int iterations = 4;
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for (int j = 0; j < 1; ++j ) {
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vec2 coord1 = reflect( v[j], rand ) * rad;
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vec2 coord2 = vec2( coord1.x*0.707 - coord1.y*0.707, coord1.x*0.707 + coord1.y*0.707 );
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ao += doAmbientOcclusion(coords,coord1*0.25,pos,normal,ray);
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ao += doAmbientOcclusion(coords,coord2*0.5,pos,normal,ray);
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ao += doAmbientOcclusion(coords,coord1*0.75,pos,normal,ray);
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ao += doAmbientOcclusion(coords,coord2,pos,normal,ray);
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}
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ao /= 16.0;
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gl_FragColor = vec4( vec3(1.0 - ao), 1.0 );
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}
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7
Shaders/ssao.vert
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7
Shaders/ssao.vert
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uniform mat4 fg_ProjectionMatrixInverse;
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varying vec4 ray;
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void main() {
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gl_Position = gl_Vertex;
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gl_TexCoord[0] = gl_MultiTexCoord0;
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ray = fg_ProjectionMatrixInverse * gl_Vertex;
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}
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