273 lines
26 KiB
Plaintext
273 lines
26 KiB
Plaintext
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SPV_KHR_non_semantic_info NonSemantic.Shader.DebugInfo.100 GLSL.std.450 main Z ÿ /home/martin/projects/loft/examples/viewer/shaders/Shading.frag uint float ggx_normal_distr // OpModuleProcessed client vulkan100
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// OpModuleProcessed target-env vulkan1.0
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// OpModuleProcessed entry-point main
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#line 1
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#version 460
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#define M_PI 3.14159265359
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layout(location = 0) in vec2 inUV;
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layout(location = 0) out vec4 outColor;
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// layout(location = 1) out vec4 outBloomThreshold;
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layout(set = 1, binding = 1) uniform sampler2D inAlbedo;
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layout(set = 1, binding = 2) uniform sampler2D inNormal;
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layout(set = 1, binding = 3) uniform sampler2D inPosition;
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layout(set = 1, binding = 4) uniform sampler2D inPbr;
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// layout(set = 1, binding = 5) uniform sampler2D shadowMap;
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float ggx_normal_distr(float NoH, float roughness) {
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float a = NoH * roughness;
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float k = roughness / (1.0 - NoH * NoH + a * a);
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return k * k * (1.0 / M_PI);
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}
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vec3 schlick(float VoH, vec3 f0) {
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return f0 + (vec3(1.0) - f0) * pow(1.0 - VoH, 5.0);
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}
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float ggx_smith_correlated(float NoV, float NoL, float a) {
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float a2 = a * a;
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float GGXL = NoV * sqrt((-NoL * a2 + NoL) * NoL + a2);
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float GGXV = NoL * sqrt((-NoV * a2 + NoV) * NoV + a2);
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return 0.5 / (GGXV + GGXL + 0.0001);
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}
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vec3 lambert_diffuse(vec3 albedo) {
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return albedo / M_PI;
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}
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layout(set = 0, binding = 0) uniform Camera {
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mat4 proj;
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mat4 view;
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vec4 position;
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} cam;
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struct Light {
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mat4 view;
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vec4 color;
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vec4 position;
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};
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layout(set = 1, binding = 0) uniform Lights {
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Light lights[];
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} lights;
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#define AMBIENT 0.1
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float linearize_depth(float depth) {
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float n = 1000.0f;
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float f = 1.0f;
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float z = depth;
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return (2.0 * n) / (f + n - z * (f - n));
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}
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float textureProj(vec4 shadowCoord, vec2 off) {
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return 0.0f;
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/* float shadow = 0.0f;
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float dist = texture( shadowMap, shadowCoord.st + off ).r;
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if ( shadowCoord.w > 0.0 )
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{
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shadow = (dist < shadowCoord.z) ? 1.0f : 0.0f;
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}
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return shadow; */
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}
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float filterPCF(vec4 sc) {
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return 0.0f;
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/* ivec2 texDim = textureSize(shadowMap, 0);
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float scale = 6.0f;
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float dx = scale * 1.0 / float(texDim.x);
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float dy = scale * 1.0 / float(texDim.y);
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float shadowFactor = 0.0;
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int count = 0;
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int range = 12;
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for (int x = -range; x <= range; x++)
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{
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for (int y = -range; y <= range; y++)
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{
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shadowFactor += textureProj(sc, vec2(dx*x, dy*y));
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count++;
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}
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}
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return shadowFactor / count; */
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}
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const mat4 biasMat = mat4(
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0.5, 0.0, 0.0, 0.0,
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0.0, 0.5, 0.0, 0.0,
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0.0, 0.0, 1.0, 0.0,
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0.5, 0.5, 0.0, 1.0
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);
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float get_shadow(int lightIdx, vec4 position) {
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Light light = lights.lights[0];
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vec4 relativePosition = light.view * position;
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vec4 shadowCoords = relativePosition / relativePosition.w;
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float shadow = filterPCF(biasMat * shadowCoords);
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return shadow;
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}
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vec3 bsdf(vec3 normal, vec3 viewDir, vec3 lightDir, vec3 baseColor, float metallic, float roughness) {
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vec3 halfway = normalize(viewDir + lightDir);
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float NoH = max(0.0, dot(normal, halfway));
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float NoL = max(0.0, dot(normal, lightDir));
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float NoV = abs(dot(normal, viewDir)) + 1e-5;
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float VoH = max(0.0, dot(viewDir, halfway));
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float LoH = max(0.0, dot(lightDir, halfway));
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/* color at 0 degree angle */
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vec3 f0 = 0.16 * (1.0 - roughness) * (1.0 - roughness) * (1.0 - metallic) + baseColor * metallic;
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vec3 diffuseColor = (1.0 - metallic) * baseColor.rgb;
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/* normal distribution of the dome */
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float D = ggx_normal_distr(NoH, roughness);
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/* occlusion of microfacets */
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float G = ggx_smith_correlated(NoV, NoL, roughness);
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/* fresnel */
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vec3 F = schlick(VoH, f0);
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vec3 specular = D * G * F; /// (4.0 * NoV * NoL + 0.0001);
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/* light emmited back by material (not reflection) */
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vec3 diffuse = lambert_diffuse(diffuseColor);
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return (diffuse + specular) * NoL * 4.0f;
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}
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vec3 bloom_threshold(vec3 base) {
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float threshold = 0.8f;
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float knee = 0.5f;
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float intensity = 0.4f;
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vec4 curveThreshold = vec4(threshold - knee, knee * 2.0f, 0.25f / max(1e-5f, knee), threshold);
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// Pixel brightness
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float br = max((base).x, max((base).y, (base).z));
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// Under-threshold part: quadratic curve
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float rq = clamp(br - curveThreshold.x, 0.0, curveThreshold.y);
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rq = curveThreshold.z * rq * rq;
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// Combine and apply the brightness response curve.
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base *= max(rq, br - curveThreshold.w) / max(1e-5, br);
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// Clamp pixel intensity if clamping enabled
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if (intensity > 0.0) {
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br = max(1e-5, max((base).x, max((base).y, (base).z)));
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base *= 1.0 - max(0.0, br - intensity) / br;
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}
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return base;
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}
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void main() {
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vec3 color = texture(inAlbedo, inUV).rgb;
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float metallic = texture(inPbr, inUV).r;
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float roughness = texture(inPbr, inUV).g;
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roughness *= roughness;
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vec3 normal = texture(inNormal, inUV).rgb;
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vec3 position = texture(inPosition, inUV).rgb;
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vec3 viewDir = normalize(-cam.position.xyz - position);
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vec3 lightDir = -normalize(vec3(lights.lights[0].view[0][2], lights.lights[0].view[1][2], lights.lights[0].view[2][2]));
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float occlusion = get_shadow(0, vec4(position, 1.0));
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float lightIntensity = 1.5f;
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vec3 Lo = bsdf(normal, viewDir, lightDir, color, metallic, roughness);
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vec3 ambient = vec3(0.2) * color;
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vec3 prd = ambient + Lo * (1.0 - occlusion) * lightIntensity;
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outColor = vec4(prd, 1.0);
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// outBloomThreshold = vec4(bloom_threshold(prd), dot(bloom_threshold(prd), bloom_threshold(prd)));
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}
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& NoH , roughness 8 schlick < VoH A f0 J ggx_smith_correlated N NoV S NoL V a ] lambert_diffuse a albedo n filterPCF r sc w int � get_shadow … lightIdx Š position – bsdf š normal Ÿ viewDir ¢ lightDir ¥ baseColor ¨ metallic main » k ë a2 ô GGXL GGXV ? bool D view J Light P light \ lights ` Lights v relativePosition € shadowCoords ‹ shadow £ halfway Ó LoH ñ diffuseColor û D G F specular ) diffuse C color I type.2d.image J @type.2d.image N type.sampled.image O @type.sampled.image T inAlbedo \ inUV g inPbr � inNormal � inPosition ž Camera £ cam ¿ occlusion Í lightIntensity Ô Lo ç ambient ñ prd outColor main ggx_normal_distr(f1;f1; NoH roughness 6 schlick(f1;vf3; 4 VoH 5 f0
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H ggx_smith_correlated(f1;f1;f1; E NoV F NoL G a [ lambert_diffuse(vf3; Z albedo l filterPCF(vf4; k sc get_shadow(i1;vf4; } lightIdx ~ position ” bsdf(vf3;vf3;vf3;vf3;f1;f1; Ž normal � viewDir � lightDir ‘ baseColor ’ metallic “ roughness ± a ¹ k é a2 ò GGXL GGXV B Light B view B color B position N light S Light S view S color S position Z Lights Z lights c lights t relativePosition ~ shadowCoords ‰ shadow – param ¡ halfway « NoH ´ NoL ½ NoV È VoH Ñ LoH Û f0 ï diffuseColor ù D ÿ param param G
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param param param F param param specular ' diffuse - param A color R inAlbedo Z inUV ` metallic e inPbr l roughness z normal inNormal † position ‹ inPosition ’ viewDir — Camera — proj — view — position ¡ cam lightDir ½ occlusion È param É param Ë lightIntensity Ò Lo Ø param Ú param Ü param Þ param à param â param å ambient ï prd ÿ outColor H S H S H S # H S # @ H S # P G X ` G Z H Z # G c ! G c " G R ! G R " G Z G e ! G e " G ! G " G ‹ ! G ‹ " G — H — H — H — # H — H — H — # @ H — # € G ¡ ! G ¡ " G ÿ ! +
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š D = ™
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