150 lines
4.8 KiB
GLSL
150 lines
4.8 KiB
GLSL
uniform sampler2D ntex;
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uniform sampler2D dtex;
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uniform sampler2D albedo;
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#ifdef GL_ES
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layout (location = 0) out vec4 Diff;
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layout (location = 1) out vec4 Spec;
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#else
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out vec4 Diff;
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out vec4 Spec;
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#endif
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#stk_include "utils/decodeNormal.frag"
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#stk_include "utils/getPosFromUVDepth.frag"
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#stk_include "utils/DiffuseIBL.frag"
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#stk_include "utils/SpecularIBL.frag"
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vec3 getXcYcZc(int x, int y, float zC)
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{
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// We use perspective symetric projection matrix hence P(0,2) = P(1, 2) = 0
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float xC= (2. * (float(x)) / u_screen.x - 1.) * zC / u_projection_matrix[0][0];
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float yC= (2. * (float(y)) / u_screen.y - 1.) * zC / u_projection_matrix[1][1];
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return vec3(xC, yC, zC);
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}
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float makeLinear(float f, float n, float z)
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{
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return (2.0f * n) / (f + n - z * (f - n));
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}
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vec3 CalcViewPositionFromDepth(in vec2 TexCoord, in sampler2D DepthMap)
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{
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// Combine UV & depth into XY & Z (NDC)
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float z = makeLinear(1000.0, 1.0, textureLod(DepthMap, TexCoord, 0.).x);
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vec3 rawPosition = vec3(TexCoord, z);
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// Convert from (0, 1) range to (-1, 1)
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vec4 ScreenSpacePosition = vec4( rawPosition * 2.0 - 1.0, 1.0);
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// Undo Perspective transformation to bring into view space
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vec4 ViewPosition = u_inverse_projection_matrix * ScreenSpacePosition;
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// Perform perspective divide and return
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return ViewPosition.xyz / ViewPosition.w;
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}
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float GetVignette(float factor)
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{
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vec2 inside = (gl_FragCoord.xy / u_screen) - 0.5;
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float vignette = 1. - dot(inside, inside) * 5.0;
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return clamp(pow(vignette, factor), 0., 1.0);
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}
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vec3 RayCast(vec3 dir, inout vec3 hitCoord, out float dDepth, in sampler2D DepthMap, in vec3 fallback, float spread)
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{
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dir *= 0.25f;
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for(int i = 0; i < 8; ++i) {
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hitCoord += dir;
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vec4 projectedCoord = u_projection_matrix * vec4(hitCoord, 1.0);
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projectedCoord.xy /= projectedCoord.w;
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projectedCoord.xy = projectedCoord.xy * 0.5 + 0.5;
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float depth = CalcViewPositionFromDepth(projectedCoord.xy, DepthMap).z;
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dDepth = hitCoord.z - depth;
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if(dDepth < 0.0)
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{
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// Texture wrapping to extand artifcially the range of the lookup texture
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// FIXME can be improved to lessen the distortion
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projectedCoord.y = min(.99, projectedCoord.y);
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projectedCoord.x = min(.99, projectedCoord.x);
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projectedCoord.x = max(.01, projectedCoord.x);
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// We want only reflection on nearly horizontal surfaces
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float cutout = dot(dir, vec3(0., 0., -1.));
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if ((projectedCoord.x > 0.0 && projectedCoord.x < 1.0)
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&& (projectedCoord.y > 0.0 && projectedCoord.y < 1.0)
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&& (cutout > 10.0)
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)
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{
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// FIXME We need to generate mipmap to take into account the gloss map
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vec3 finalColor = textureLod(albedo, projectedCoord.xy, spread).rgb;
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//return finalColor;
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return mix(fallback, finalColor, GetVignette(4.));
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}
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else
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{
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return fallback;
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}
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}
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}
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return fallback;
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}
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// Main ===================================================================
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void main(void)
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{
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vec2 uv = gl_FragCoord.xy / u_screen;
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vec3 normal = normalize(DecodeNormal(2. * texture(ntex, uv).xy - 1.));
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Diff = vec4(0.25 * DiffuseIBL(normal), 1.);
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float z = texture(dtex, uv).x;
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vec4 xpos = getPosFromUVDepth(vec3(uv, z), u_inverse_projection_matrix);
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vec3 eyedir = -normalize(xpos.xyz);
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// Extract roughness
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float specval = texture(ntex, uv).z;
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#ifdef GL_ES
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Spec = vec4(.25 * SpecularIBL(normal, eyedir, specval), 1.);
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#else
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// :::::::: Compute Space Screen Reflection ::::::::::::::::::::::::::::::::::::
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float lineardepth = textureLod(dtex, uv, 0.).x;
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// Fallback (if the ray can't find an intersection we display the sky)
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vec3 fallback = .25 * SpecularIBL(normal, eyedir, specval);
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float View_Depth = makeLinear(1000.0, 1.0, lineardepth);
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vec3 ScreenPos = xpos.xyz;
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vec4 View_Pos = u_inverse_projection_matrix * vec4(ScreenPos, 1.0f);
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View_Pos /= View_Pos.w;
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// Reflection vector
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vec3 reflected = normalize(reflect(eyedir, normal));
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// Ray cast
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vec3 hitPos = View_Pos.xyz;
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float dDepth;
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float minRayStep = 100.0f;
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vec3 outColor = RayCast(reflected * max(minRayStep, -xpos.z),
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hitPos, dDepth, dtex, fallback, 0.0);
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// TODO temporary measure the lack of mipmaping for RTT albedo
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// Implement it in proper way
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outColor = mix(fallback, outColor, specval);
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Spec = vec4(outColor.rgb, 1.0);
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#endif
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}
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