79 lines
2.6 KiB
GLSL
79 lines
2.6 KiB
GLSL
uniform sampler2D ntex;
|
|
uniform sampler2D dtex;
|
|
uniform sampler2D noise_texture;
|
|
uniform vec4 samplePoints[16];
|
|
|
|
#ifdef UBO_DISABLED
|
|
uniform mat4 ViewMatrix;
|
|
uniform mat4 ProjectionMatrix;
|
|
uniform mat4 InverseViewMatrix;
|
|
uniform mat4 InverseProjectionMatrix;
|
|
#else
|
|
layout (std140) uniform MatrixesData
|
|
{
|
|
mat4 ViewMatrix;
|
|
mat4 ProjectionMatrix;
|
|
mat4 InverseViewMatrix;
|
|
mat4 InverseProjectionMatrix;
|
|
mat4 ShadowViewProjMatrixes[4];
|
|
};
|
|
#endif
|
|
|
|
in vec2 uv;
|
|
out float AO;
|
|
|
|
const float strengh = 5.;
|
|
const float radius = 1.f;
|
|
|
|
#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));
|
|
}
|
|
|
|
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 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);
|
|
|
|
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;
|
|
|
|
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);
|
|
|
|
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.;
|
|
}
|
|
|
|
AO = max(1.0 - bl * invSamples, 0.);
|
|
}
|