063ea38cc6
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@14594 178a84e3-b1eb-0310-8ba1-8eac791a3b58
120 lines
3.2 KiB
GLSL
120 lines
3.2 KiB
GLSL
uniform sampler2D ntex;
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uniform sampler2D dtex;
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uniform sampler2D cloudtex;
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uniform sampler2D shadowtex;
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uniform sampler2D warpx;
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uniform sampler2D warpy;
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uniform vec3 center;
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uniform vec3 col;
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uniform vec2 screen;
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uniform mat4 invprojview;
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uniform mat4 shadowmat;
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uniform int hasclouds;
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uniform vec2 wind;
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uniform float shadowoffset;
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float decdepth(vec4 rgba) {
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return dot(rgba, vec4(1.0, 1.0/255.0, 1.0/65025.0, 1.0/16581375.0));
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}
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void main() {
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vec2 texc = gl_FragCoord.xy / screen;
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vec4 depthread = texture2D(dtex, texc);
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float z = decdepth(vec4(depthread.xyz, 0.0));
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if (z < 0.03)
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{
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// Skyboxes are fully lit
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gl_FragData[0] = vec4(1.0);
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gl_FragData[1] = vec4(0.0);
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return;
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}
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vec3 norm = texture2D(ntex, texc).xyz;
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norm = (norm - 0.5) * 2.0;
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// Normalized on the cpu
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vec3 L = center;
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float NdotL = max(0.0, dot(norm, L));
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if (NdotL < 0.01) discard;
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vec3 outcol = NdotL * col;
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// World-space position
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vec3 tmp = vec3(texc, z);
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tmp = tmp * 2.0 - 1.0;
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vec4 xpos = vec4(tmp, 1.0);
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xpos = invprojview * xpos;
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xpos.xyz /= xpos.w;
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if (hasclouds == 1)
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{
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vec2 cloudcoord = (xpos.xz * 0.00833333) + wind;
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float cloud = texture2D(cloudtex, cloudcoord).x;
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//float cloud = step(0.5, cloudcoord.x) * step(0.5, cloudcoord.y);
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outcol *= cloud;
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}
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// Shadows
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vec3 shadowcoord = (shadowmat * vec4(xpos.xyz, 1.0)).xyz;
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shadowcoord = (shadowcoord * 0.5) + vec3(0.5);
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float movex = decdepth(texture2D(warpx, shadowcoord.xy));
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float movey = decdepth(texture2D(warpy, shadowcoord.xy));
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float dx = movex * 2.0 - 1.0;
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float dy = movey * 2.0 - 1.0;
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shadowcoord.xy += vec2(dx, dy);
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vec4 shadowread = texture2D(shadowtex, shadowcoord.xy);
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float shadowmapz = decdepth(vec4(shadowread.xyz, 0.0));
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float moved = (abs(dx) + abs(dy)) * 0.5;
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/*
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float bias = 0.002 * tan(acos(NdotL)); // According to the slope
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bias += smoothstep(0.001, 0.1, moved) * 0.014; // According to the warping
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bias = clamp(bias, 0.001, 0.014);
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*/
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/*
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float avi = 0.002;
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float abi = 0.0025; */
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float avi = 0.0018;
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float abi = 0.002;
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float bias = avi * tan(acos(NdotL)); // According to the slope
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bias += smoothstep(0.001, 0.1, moved) * abi; // According to the warping
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bias = clamp(bias, 0.001, abi);
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// This ID, and four IDs around this must match for a shadow pixel
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float right = texture2D(shadowtex, shadowcoord.xy + vec2(shadowoffset, 0.0)).a;
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float left = texture2D(shadowtex, shadowcoord.xy + vec2(-shadowoffset, 0.0)).a;
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float up = texture2D(shadowtex, shadowcoord.xy + vec2(0.0, shadowoffset)).a;
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float down = texture2D(shadowtex, shadowcoord.xy + vec2(0.0, -shadowoffset)).a;
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float matching = ((right + left + up + down) * 0.25) - shadowread.a;
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matching = abs(matching) * 400.0;
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// If the ID is different, we're likely in shadow - cut the bias to cut peter panning
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float off = 7.0 - step(abs(shadowread.a - depthread.a) - matching, 0.004) * 6.0;
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bias /= off;
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const float softness = 8.0; // How soft is the light?
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float shadowed = step(shadowmapz + bias, shadowcoord.z);
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float dist = (shadowcoord.z / shadowmapz) - 1.0;
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float penumbra = dist * softness / gl_FragCoord.z;
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penumbra *= shadowed;
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/* outcol.r = (shadowcoord.z - shadowmapz) * 50.0;
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outcol.g = moved;*/
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gl_FragData[0] = vec4(outcol, 0.05);
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gl_FragData[1] = vec4(shadowed, penumbra, shadowed, shadowed);
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}
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