ilikecats/stk-code_catmod
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Merge branch 'SAO'

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vlj
2014-05-12 00:35:08 +02:00
parent 41e02e0880 4fcec02123
commit 384c9f2c77
4 changed files with 45 additions and 44 deletions
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76
data/shaders/ssao.frag
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@@ -1,3 +1,6 @@
// From paper http://graphics.cs.williams.edu/papers/AlchemyHPG11/
// and improvements here http://graphics.cs.williams.edu/papers/SAOHPG12/
uniform sampler2D ntex;
uniform sampler2D dtex;
uniform sampler2D noise_texture;
@@ -22,57 +25,56 @@ layout (std140) uniform MatrixesData
in vec2 uv;
out float AO;
const float strengh = 5.;
const float radius = 1.f;
const float sigma = 1.;
const float tau = 7.;
const float beta = 0.0001;
const float epsilon = .00001;
const float radius = 2.;
const float k = 1.5;
#define SAMPLES 16
const float invSamples = strengh / SAMPLES;
vec3 rand(vec2 co)
{
float noiseX = clamp(fract(sin(dot(co ,vec2(12.9898,78.233))) * 43758.5453),0.0,1.0)*2.0-1.0;
float noiseY = clamp(fract(sin(dot(co ,vec2(12.9898,78.233)*2.0)) * 43758.5453),0.0,1.0)*2.0-1.0;
return vec3(noiseX, noiseY, length(texture(noise_texture, co * pow(3.14159265359, 2.)).xyz));
}
const float invSamples = 1. / SAMPLES;
vec3 DecodeNormal(vec2 n);
vec4 getPosFromUVDepth(vec3 uvDepth, mat4 InverseProjectionMatrix);
void main(void)
{
vec4 cur = texture(ntex, uv);
float curdepth = texture(dtex, uv).x;
vec4 cur = texture(ntex, uv);
float curdepth = texture(dtex, uv).x;
vec4 FragPos = getPosFromUVDepth(vec3(uv, curdepth), InverseProjectionMatrix);
// get the normal of current fragment
vec3 norm = normalize(DecodeNormal(2. * texture(ntex, uv).xy - 1.));
// Workaround for nvidia and skyboxes
float len = dot(vec3(1.0), abs(cur.xyz));
if (len < 0.2 || curdepth > 0.9955) discard;
// Make a tangent as random as possible
vec3 randvect = rand(uv);
vec3 tangent = normalize(cross(norm, randvect));
vec3 bitangent = cross(norm, tangent);
// get the normal of current fragment
vec3 ddx = dFdx(FragPos.xyz);
vec3 ddy = dFdy(FragPos.xyz);
vec3 norm = normalize(cross(ddy, ddx));
// Workaround for nvidia and skyboxes
float len = dot(vec3(1.0), abs(cur.xyz));
if (len < 0.2) discard;
float bl = 0.0;
int x = int(1024. * uv.x), y = int(1024. * uv.y);
float r = radius / FragPos.z;
float phi = 30. * (x ^ y) + 10. * x * y;
float bl = 0.0;
for(int i = 0; i < SAMPLES; ++i) {
vec3 sampleDir = samplePoints[i].x * tangent + samplePoints[i].y * bitangent + samplePoints[i].z * norm;
sampleDir *= samplePoints[i].w;
vec4 samplePos = FragPos + radius * vec4(sampleDir, 0.0);
vec4 sampleProj = ProjectionMatrix * samplePos;
sampleProj /= sampleProj.w;
for(int i = 0; i < SAMPLES; ++i) {
float alpha = (i + .5) * invSamples;
float theta = 2. * 3.14 * tau * alpha + phi;
float h = r * alpha;
vec2 occluder_uv = h * vec2(cos(theta), sin(theta));
occluder_uv += uv;
bool isInsideTexture = (sampleProj.x > -1.) && (sampleProj.x < 1.) && (sampleProj.y > -1.) && (sampleProj.y < 1.);
// get the depth of the occluder fragment
float occluderFragmentDepth = texture(dtex, (sampleProj.xy * 0.5) + 0.5).x;
// Position of the occluder fragment in worldSpace
vec4 occluderPos = getPosFromUVDepth(vec3((sampleProj.xy * 0.5) + 0.5, occluderFragmentDepth), InverseProjectionMatrix);
if (occluder_uv.x < 0. || occluder_uv.x > 1. || occluder_uv.y < 0. || occluder_uv.y > 1.) continue;
bool isOccluded = isInsideTexture && (sampleProj.z > (2. * occluderFragmentDepth - 1.0)) && (distance(FragPos, occluderPos) < radius);
bl += isOccluded ? samplePoints[i].z * smoothstep(5 * radius, 0, distance(samplePos, FragPos)) : 0.;
}
float m = round(log2(h)) + 6.;
AO = max(1.0 - bl * invSamples, 0.);
float occluderFragmentDepth = textureLod(dtex, occluder_uv, m).x;
vec4 OccluderPos = getPosFromUVDepth(vec3(occluder_uv, occluderFragmentDepth), InverseProjectionMatrix);
vec3 vi = (OccluderPos - FragPos).xyz;
bl += max(0, dot(vi, norm) - FragPos.z * beta) / (dot(vi, vi) + epsilon);
}
AO = max(pow(1.0 - 2. * sigma * bl * invSamples, k), 0.);
}

8
src/graphics/post_processing.cpp
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@@ -423,11 +423,11 @@ void PostProcessing::renderSSAO()
glUseProgram(FullScreenShader::SSAOShader::Program);
glBindVertexArray(FullScreenShader::SSAOShader::vao);
setTexture(0, irr_driver->getRenderTargetTexture(RTT_NORMAL_AND_DEPTH), GL_LINEAR, GL_LINEAR);
setTexture(1, irr_driver->getDepthStencilTexture(), GL_LINEAR, GL_LINEAR);
setTexture(2, getTextureGLuint(noise_tex), GL_LINEAR, GL_LINEAR);
setTexture(0, irr_driver->getDepthStencilTexture(), GL_LINEAR, GL_LINEAR_MIPMAP_LINEAR);
glGenerateMipmap(GL_TEXTURE_2D);
setTexture(1, getTextureGLuint(noise_tex), GL_LINEAR, GL_LINEAR);
FullScreenShader::SSAOShader::setUniforms(0, 1, 2);
FullScreenShader::SSAOShader::setUniforms(0, 1);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}

3
src/graphics/shaders.cpp
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@@ -2624,13 +2624,12 @@ namespace FullScreenShader
}*/
}
void SSAOShader::setUniforms(unsigned TU_ntex, unsigned TU_dtex, unsigned TU_noise)
void SSAOShader::setUniforms(unsigned TU_dtex, unsigned TU_noise)
{
if (UserConfigParams::m_ubo_disabled)
bypassUBO(Program);
glUniform4fv(FullScreenShader::SSAOShader::uniform_samplePoints, 16, FullScreenShader::SSAOShader::SSAOSamples);
glUniform1i(FullScreenShader::SSAOShader::uniform_ntex, TU_ntex);
glUniform1i(FullScreenShader::SSAOShader::uniform_dtex, TU_dtex);
glUniform1i(FullScreenShader::SSAOShader::uniform_noise_texture, TU_noise);
}

2
src/graphics/shaders.hpp
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@@ -712,7 +712,7 @@ public:
static float SSAOSamples[64];
static void init();
static void setUniforms(unsigned TU_ntex, unsigned TU_dtex, unsigned TU_noise);
static void setUniforms(unsigned TU_dtex, unsigned TU_noise);
};
class FogShader