118 lines
4.4 KiB
GLSL
118 lines
4.4 KiB
GLSL
// WIP
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#ifndef SHADOWMAP_GLSL
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#define SHADOWMAP_GLSL
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// uniform mat4 view = mat4(1.0);
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uniform vec3 lightPos; /// set:1,1,1
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uniform float doTexture; /// set:1
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#ifdef VSMCUBE
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uniform samplerCube shadowMap; // VSMCUBE
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#else
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uniform sampler2D shadowMap; // !VSMCUBE
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#endif
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struct light {
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vec3 position; // world-space
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vec4 diffuse;
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vec4 specular;
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float constantAttenuation, linearAttenuation, quadraticAttenuation;
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};
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light light0 = light(
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vec3(1,1,1), // lightPos
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vec4(1,1,1,1), // diffuse
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vec4(1,1,1,1), // specular
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1.0, 0.0, 0.0 // attenuation (const, linear, quad)
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);
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// From http://fabiensanglard.net/shadowmappingVSM/index.php
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#ifdef VSMCUBE
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float chebyshevUpperBound(float distance, vec3 dir) {
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distance = distance/20 ;
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vec2 moments = texture(shadowMap, dir).rg;
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#else
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float chebyshevUpperBound(float distance, vec4 scPostW) {
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vec2 moments = texture(shadowMap,scPostW.xy).rg;
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#endif
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// Surface is fully lit. as the current fragment is before the light occluder
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if (distance <= moments.x)
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return 1.0;
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// The fragment is either in shadow or penumbra. We now use chebyshev's upperBound to check
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// How likely this pixel is to be lit (p_max)
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float variance = moments.y - (moments.x*moments.x);
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//variance = max(variance, 0.000002);
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variance = max(variance, 0.00002);
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float d = distance - moments.x;
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float p_max = variance / (variance + d*d);
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return p_max;
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}
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vec4 shadowmap(in vec4 vpeye, in vec4 vneye, in vec2 uv, in vec4 sc) {
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#ifndef VSMCUBE
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return vec4(1.);
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#else
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vec3 fragment = vec3(vpeye);
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vec3 normal = vec3(normalize(vneye));
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vec3 viewDir = normalize(-fragment);
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// Lighting
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// Convert to eye-space
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vec3 light = vec3(view * vec4(light0.position, 1.0));
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#ifdef VSMCUBE
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// Vectors
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vec3 fragmentToLight = light - fragment;
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vec3 fragmentToLightDir = normalize(fragmentToLight);
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// Shadows
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vec4 fragmentToLight_world = inverse(view) * vec4(fragmentToLightDir, 0.0);
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float shadowFactor = chebyshevUpperBound(length(fragmentToLight), -fragmentToLight_world.xyz);
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#else
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// Shadows
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vec4 scPostW = sc / sc.w;
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scPostW = scPostW * 0.5 + 0.5;
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float shadowFactor = 1.0; // Not in shadow
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bool outsideShadowMap = sc.w <= 0.0f || (scPostW.x < 0 || scPostW.y < 0) || (scPostW.x >= 1 || scPostW.y >= 1);
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if (!outsideShadowMap) {
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shadowFactor = chebyshevUpperBound(scPostW.z, scPostW);
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}
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#endif
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vec4 diffColor = vec4(1,1,1,1);
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#ifdef VSMCUBE
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if(doTexture != 0) diffColor = vec4(vec3(texture(shadowMap, -fragmentToLight_world.xyz).r), 1.0);
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#else
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if(doTexture != 0) diffColor = vec4(vec3(texture(shadowMap, vec2(uv.x, 1.0 - uv.y)).r), 1.0);
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#endif
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#if 1
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vec3 positionToLight = light - fragment;
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vec3 lightDir = normalize(positionToLight);
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// Angle between fragment-normal and incoming light
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float cosAngIncidence = dot(lightDir, normal);
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cosAngIncidence = clamp(cosAngIncidence, 0, 1);
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float attenuation = 1.0f;
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attenuation = 1.0 / (light0.constantAttenuation + light0.linearAttenuation * length(positionToLight) + light0.quadraticAttenuation * pow(length(positionToLight),2));
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vec4 diffuse = diffColor * light0.diffuse * cosAngIncidence * attenuation;
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vec4 total_lighting;
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total_lighting += vec4(0.1, 0.1, 0.1, 1.0) * diffColor; // Ambient
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total_lighting += diffuse * shadowFactor; // Diffuse
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#else
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vec4 total_lighting = diffColor;
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#endif
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return vec4(clamp(vec3(total_lighting), 0., 1.), 1.0);
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#endif
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}
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#endif |