635 lines
17 KiB
GLSL
635 lines
17 KiB
GLSL
//*PIXEL*
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#version 460 core
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#extension GL_ARB_bindless_texture : require
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#extension GL_ARB_gpu_shader5 : enable
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uint INVALID_HYDRA_ID = 4294967295;
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uint DEPTH_TEXTURE_ID = 0;
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uint DIFFUSE_TEXTURE_ID = 1;
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uint METAL_ROUGH_TEXTURE_ID = 2;
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uint NORMAL_TEXTURE_ID = 3;
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uint POSITION_TEXTIURE_ID = 4;
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uint HYDRA_LIGHT_DIRECTIONAL = 1;
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uint HYDRA_LIGHT_POINT = 2;
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uint HYDRA_LIGHT_SPOT = 3;
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struct LightStructure
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{
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vec4 ambient;
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vec4 diffuse;
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vec4 specular;
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float intensity;
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float constant;
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float linear;
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float quadratic;
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float cutoff;
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float cutoff_outer;
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uint entity_id;
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uint light_type;
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uint shadow_map_id;
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uint shadow_caster;
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uint padding0;
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uint padding1;
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};
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struct DirectionalShadowMapSet
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{
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uint entity_id;
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uint shadow_id;
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uint shadow_texture_id;
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uint frame_buffer_id;
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float near_plane[8];
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float far_plane[8];
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mat4 light_space_proj[6];
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mat4 light_space_view[6];
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};
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struct SpotShadowMapSet
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{
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uint entity_id;
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uint shadow_id;
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uint shadow_texture_id;
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uint frame_buffer_id;
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float far_plane;
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uint padding[3];
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mat4 light_space_proj;
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mat4 light_space_view;
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};
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struct PointShadowMapSet
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{
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uint entity_id;
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uint shadow_id;
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uint shadow_texture_id;
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uint frame_buffer_id;
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float near_plane;
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float far_plane;
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uint padding[2];
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mat4 light_space_proj;
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mat4 light_space_view[6];
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};
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uniform samplerCube depth_map;
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layout(binding = 0) uniform uniform_per_frame
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{
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mat4 view;
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mat4 proj;
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vec3 viewer_pos;
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uint light_count;
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} ubo_per_frame;
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layout(binding = 1) uniform uniform_output_textures
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{
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uint texture_ids[16];
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};
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layout(std430, binding = 1) readonly buffer positions_buffer
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{
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mat4 model_matrix[];
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};
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layout( std430, binding = 3) readonly buffer texture_buffer {
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uvec2 textures[1000];
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};
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layout (std430, binding = 4) readonly buffer light_buffer
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{
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LightStructure lights[500];
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};
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layout (std430, binding = 5) readonly buffer directional_shadow_map_sets
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{
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DirectionalShadowMapSet directional_shadows[];
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};
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layout (std430, binding = 6) readonly buffer spot_shadow_map_sets
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{
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SpotShadowMapSet spot_shadows[];
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};
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layout (std430, binding = 7) readonly buffer point_shadow_map_sets
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{
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PointShadowMapSet point_shadows[];
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};
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layout (location=0) in VS_OUT
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{
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vec2 vsUV;
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}vs_out;
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layout (location=0) out vec4 uFragColor;
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const float PI = 3.14159265358979323846;
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const float M_INV_PI = 0.31830988618379067153776752674503;
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float sqr(float x) { return x*x; }
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// ----------------------------------------------------------------------------
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float DistributionGGX(vec3 N, vec3 H, float roughness)
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{
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float a = roughness*roughness;
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float a2 = a*a;
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float NdotH = max(dot(N, H), 0.0);
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float NdotH2 = NdotH*NdotH;
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float nom = a2;
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float denom = (NdotH2 * (a2 - 1.0) + 1.0);
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denom = PI * denom * denom;
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return nom / denom;
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}
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// ----------------------------------------------------------------------------
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float GeometrySchlickGGX(float NdotV, float roughness)
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{
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float r = (roughness + 1.0);
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float k = (r*r) / 8.0;
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float nom = NdotV;
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float denom = NdotV * (1.0 - k) + k;
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return nom / denom;
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}
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// ----------------------------------------------------------------------------
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float GeometrySmith(vec3 N, vec3 V, vec3 L, float roughness)
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{
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float NdotV = max(dot(N, V), 0.0);
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float NdotL = max(dot(N, L), 0.0);
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float ggx2 = GeometrySchlickGGX(NdotV, roughness);
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float ggx1 = GeometrySchlickGGX(NdotL, roughness);
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return ggx1 * ggx2;
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}
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// ----------------------------------------------------------------------------
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vec3 fresnelSchlick(float cosTheta, vec3 F0)
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{
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return F0 + (1.0 - F0) * pow(clamp(1.0 - cosTheta, 0.0, 1.0), 5.0);
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}
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vec3 CalculatePBR(vec3 normal, vec3 view_pos, vec3 world_pos,vec3 light_dir, vec3 diffuse, vec3 radiance, float roughness, float metallic )
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{
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vec3 N = normalize(normal);
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vec3 V = normalize(view_pos - world_pos);
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// calculate reflectance at normal incidence; if dia-electric (like plastic) use F0
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// of 0.04 and if it's a metal, use the albedo color as F0 (metallic workflow)
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vec3 F0 = vec3(0.04);
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F0 = mix(F0, diffuse, metallic);
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// calculate per-light radiance
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vec3 L = normalize(light_dir);
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vec3 H = normalize(V + L);
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// Cook-Torrance BRDF
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float NDF = DistributionGGX(N, H, roughness);
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float G = GeometrySmith(N, V, L, roughness);
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vec3 F = fresnelSchlick(clamp(dot(H, V), 0.0, 1.0), F0);
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vec3 numerator = NDF * G * F;
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float denominator = 4.0 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.0001; // + 0.0001 to prevent divide by zero
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vec3 specular = numerator / denominator;
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// kS is equal to Fresnel
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vec3 kS = F;
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// for energy conservation, the diffuse and specular light can't
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// be above 1.0 (unless the surface emits light); to preserve this
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// relationship the diffuse component (kD) should equal 1.0 - kS.
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vec3 kD = vec3(1.0) - kS;
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// multiply kD by the inverse metalness such that only non-metals
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// have diffuse lighting, or a linear blend if partly metal (pure metals
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// have no diffuse light).
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kD *= 1.0 - metallic;
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// scale light by NdotL
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float NdotL = max(dot(N, L), 0.0);
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// add to outgoing radiance Lo
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vec3 Lo = (kD * diffuse / PI + specular) * radiance * NdotL; // note that we already multiplied the BRDF by the Fresnel (kS) so we won't multiply by kS again
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return Lo;
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}
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vec3 DirectionalShading(vec3 normal,
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vec3 diffuse,
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float roughness,
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float metallic,
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float light_intensity,
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vec3 light_dir,
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vec3 light_pos,
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vec3 world_pos,
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vec3 view_pos)
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{
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float distance = length(light_pos - world_pos);
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float attenuation = 1.0;
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vec3 radiance = diffuse * attenuation;
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vec3 Lo = CalculatePBR(normal, view_pos, world_pos, light_dir, diffuse, radiance, roughness, metallic);
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return Lo;
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}
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vec3 PointShading(vec3 normal,
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vec3 diffuse,
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float roughness,
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float metallic,
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float light_intensity,
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vec3 light_pos,
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float light_constant,
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float light_linear,
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float light_quadratic,
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vec3 world_pos,
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vec3 view_pos,
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float shadow_val)
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{
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float distance = length(light_pos - world_pos);
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float attenuation = 1.0;
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attenuation = light_intensity / (light_constant + (light_linear * distance) + (light_quadratic * distance * distance));
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vec3 radiance = diffuse * attenuation * (1.0-shadow_val);
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vec3 light_dir = normalize(light_pos - world_pos);
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vec3 Lo = CalculatePBR(normal, view_pos, world_pos, light_dir, diffuse, radiance, roughness, metallic);
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return Lo;
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}
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vec3 SpotShading(vec3 normal,
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vec3 diffuse,
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float roughness,
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float metallic,
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float light_intensity,
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vec3 light_dir,
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vec3 light_pos,
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float cutoff,
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float cutoff_outer,
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float light_constant,
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float light_linear,
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float light_quadratic,
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vec3 world_pos,
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vec3 view_pos,
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float shadow_val)
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{
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vec3 direction_to_light = normalize(light_pos - world_pos);
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float theta = dot(direction_to_light, light_dir);
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float falloff = 0.0f;
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float epsilon = cutoff - cutoff_outer;
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falloff = clamp((theta - cutoff_outer) / epsilon, 0.0, 1.0);
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float distance = length(light_pos - world_pos);
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float attenuation = 1.0;
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attenuation = light_intensity / (light_constant + (light_linear * distance) + (light_quadratic * distance * distance));
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vec3 radiance = diffuse * attenuation * falloff * (1.0-shadow_val);
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vec3 Lo = CalculatePBR(normal, view_pos, world_pos, direction_to_light, diffuse, radiance, roughness, metallic);
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return Lo;// * shadow;
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}
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mat3 GetRotationOnlyMatrix(mat4 model_mat)
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{
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mat3 rot_mat;
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rot_mat[0] = model_mat[0].xyz;
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rot_mat[1] = model_mat[1].xyz;
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rot_mat[2] = model_mat[2].xyz;
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return rot_mat;
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}
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float SimpleSampleShadow(vec4 frag_clip_space, sampler2DArray sampler_shadow_map, uint shadow_trans_idx)
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{
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vec3 frag_light_space = frag_clip_space.xyz / frag_clip_space.w;
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frag_light_space = (frag_light_space * 0.5) + 0.5;
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float shadow_map_depth = texture(sampler_shadow_map, vec3(frag_light_space.xy, shadow_trans_idx)).r;
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// return frag_light_space.z - shadow_map_depth;
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//return shadow_map_depth ;
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//return frag_light_space.z;
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if(frag_light_space.z > shadow_map_depth)
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{
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return 0;
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}
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return 1;
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}
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float SampleCascadeShadow(vec4 frag_clip_space, sampler2DArray sampler_shadow_map, uint shadow_trans_idx, vec3 normal, vec3 light_dir)
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{
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vec3 frag_light_space = frag_clip_space.xyz / frag_clip_space.w;
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frag_light_space = (frag_light_space * 0.5) + 0.5;
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float shadow_map_depth = texture(sampler_shadow_map, vec3(frag_light_space.xy, shadow_trans_idx)).r;
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// calculate bias (based on depth map resolution and slope)
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float mapped_distance = (shadow_trans_idx*2);
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float bias = 0.0f;//max(0.0001 * (1.0 - dot(normal, light_dir)), 0.00001);
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// check whether current frag pos is in shadow
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// float shadow = currentDepth - bias > closestDepth ? 1.0 : 0.0;
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// PCF
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if(shadow_trans_idx < 3)
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{
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bias = 0.00001;
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}
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else if(shadow_trans_idx == 3)
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{
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bias = 0.0001;// + (0.000001 * mapped_distance);
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}
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else
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{
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bias = 0.0005;
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}
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float shadow = 0.0;
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vec2 texel_size = 1.0 / textureSize(sampler_shadow_map, 0).xy;
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if((frag_light_space.x >= 0.0)&&(frag_light_space.y >= 0.0)
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&&(frag_light_space.x <= 1.0)&&(frag_light_space.y <= 1.0))
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{
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for(int x = -1; x <= 1; ++x)
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{
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for(int y = -1; y <= 1; ++y)
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{
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shadow_map_depth = texture(sampler_shadow_map, vec3(frag_light_space.xy + vec2(x, y) * texel_size, shadow_trans_idx)).r;
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shadow += (frag_light_space.z - bias) > shadow_map_depth ? 1.0 : 0.0;
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}
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}
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shadow /= 9.0;
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}
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// keep the shadow at 0.0 when outside the far_plane region of the light's frustum.
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if(frag_light_space.z > 1.0)
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shadow = 0.0;
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return shadow;
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}
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float SampleSingleShadow(vec4 frag_clip_space, sampler2D sampler_shadow_map, vec3 normal, vec3 light_dir)
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{
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vec3 frag_light_space = frag_clip_space.xyz / frag_clip_space.w;
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frag_light_space = (frag_light_space * 0.5) + 0.5;
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float shadow_map_depth = texture(sampler_shadow_map, frag_light_space.xy).r;
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// calculate bias (based on depth map resolution and slope)
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float bias = max(0.00005 * (1.0 - dot(normal, light_dir)), 0.000005);
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// check whether current frag pos is in shadow
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// float shadow = currentDepth - bias > closestDepth ? 1.0 : 0.0;
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// PCF
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//bias = 0;
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float shadow = 0.0;
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vec2 texel_size = 1.0 / textureSize(sampler_shadow_map, 0).xy;
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if((frag_light_space.x >= 0.0)&&(frag_light_space.y >= 0.0)
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&&(frag_light_space.x <= 1.0)&&(frag_light_space.y <= 1.0))
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{
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for(int x = -1; x <= 1; ++x)
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{
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for(int y = -1; y <= 1; ++y)
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{
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shadow_map_depth = texture(sampler_shadow_map, frag_light_space.xy + vec2(x, y) * texel_size).r;
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shadow += frag_light_space.z - bias > shadow_map_depth ? 1.0 : 0.0;
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}
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}
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shadow /= 9.0;
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}
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// keep the shadow at 0.0 when outside the far_plane region of the light's frustum.
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if(frag_light_space.z > 1.0)
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shadow = 0.0;
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return shadow;
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}
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vec3 CalculateDirectionalShadow(vec4 world_pos, uint shadow_idx, vec3 normal, vec3 light_dir, vec3 viewer_pos)
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{
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float shadow = 1;
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//measure the distance of the fragment from the light
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float frag_distance = abs(length(viewer_pos - world_pos.xyz));
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uint shadow_trans_idx = 5;
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uint ignore_shadow = 0;
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//Work out which shadowmap is appropriate for this distance
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for(uint i = 0; i < 6; i++)
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{
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if(frag_distance <= directional_shadows[shadow_idx].far_plane[i])
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{
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//record the shadow map level
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shadow_trans_idx = i;
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//and indicate that this has a level
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ignore_shadow = 1;
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break;
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}
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}
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if(ignore_shadow == 1)
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{
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vec4 translated_pixel = directional_shadows[shadow_idx].light_space_proj[shadow_trans_idx] *
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directional_shadows[shadow_idx].light_space_view[shadow_trans_idx] *
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world_pos;
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uvec2 shadow_handle = textures[directional_shadows[shadow_idx].shadow_texture_id];
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shadow = 1.0 - SampleCascadeShadow(translated_pixel, sampler2DArray(shadow_handle), shadow_trans_idx, normal, light_dir);
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}
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return vec3(shadow);
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if(shadow_trans_idx == 0)
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{
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return vec3(1,0,0);
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}
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if(shadow_trans_idx == 1)
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{
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return vec3(0,1,0);
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}
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if(shadow_trans_idx == 2)
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{
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return vec3(0,0,1);
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}
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if(shadow_trans_idx == 3)
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{
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return vec3(1,1,0);
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}
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if(shadow_trans_idx == 4)
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{
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return vec3(1,0,1);
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}
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if(shadow_trans_idx == 5)
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{
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return vec3(0,1,1);
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}
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}
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float CalculateSpotShadow(vec4 world_pos, uint shadow_idx, vec3 normal, vec3 light_dir, vec3 viewer_pos)
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{
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vec4 translated_pixel = spot_shadows[shadow_idx].light_space_proj *
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spot_shadows[shadow_idx].light_space_view *
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world_pos;
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uvec2 shadow_handle = textures[spot_shadows[shadow_idx].shadow_texture_id];
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float shadow =(SampleSingleShadow(translated_pixel, sampler2D(shadow_handle), normal, light_dir));
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return shadow;
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}
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float SampleCubemapShadow(vec3 frag_to_light, float far_plane, float view_distance, samplerCube sampler_shadow_map)
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{
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vec3 sample_offset_directions[20] = vec3[]
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(
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vec3( 1, 1, 1), vec3( 1, -1, 1), vec3(-1, -1, 1), vec3(-1, 1, 1),
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vec3( 1, 1, -1), vec3( 1, -1, -1), vec3(-1, -1, -1), vec3(-1, 1, -1),
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vec3( 1, 1, 0), vec3( 1, -1, 0), vec3(-1, -1, 0), vec3(-1, 1, 0),
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vec3( 1, 0, 1), vec3(-1, 0, 1), vec3( 1, 0, -1), vec3(-1, 0, -1),
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vec3( 0, 1, 1), vec3( 0, -1, 1), vec3( 0, -1, -1), vec3( 0, 1, -1)
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);
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float shadow = 0.0;
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float bias = 0.05;
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int samples = 20;
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float disk_radius = (1.0 + (view_distance / far_plane)) / 50.0;
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float frag_depth = length(frag_to_light);
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for(int i = 0; i < samples; ++i)
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{
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float closest_depth = texture(sampler_shadow_map, frag_to_light + sample_offset_directions[i] * disk_radius).r;
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closest_depth *= far_plane; // undo mapping [0;1]
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if(frag_depth - bias > closest_depth)
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shadow += 1.0;
|
|
}
|
|
shadow /= float(samples);
|
|
return shadow;
|
|
|
|
}
|
|
|
|
float CalculatePointShadow(vec3 world_pos, uint shadow_idx, float view_distance, vec3 light_position)
|
|
{
|
|
vec3 frag_to_light = light_position - world_pos;
|
|
|
|
uvec2 shadow_handle = textures[point_shadows[shadow_idx].shadow_texture_id];
|
|
float far_plane = point_shadows[shadow_idx].far_plane;
|
|
return SampleCubemapShadow(frag_to_light, far_plane, view_distance, samplerCube(shadow_handle));
|
|
}
|
|
|
|
void main()
|
|
{
|
|
uvec2 diffuse_handle = textures[texture_ids[DIFFUSE_TEXTURE_ID]];
|
|
uvec2 normal_handle = textures[texture_ids[NORMAL_TEXTURE_ID]];
|
|
uvec2 metal_rough_handle = textures[texture_ids[METAL_ROUGH_TEXTURE_ID]];
|
|
uvec2 world_pos_handle = textures[texture_ids[POSITION_TEXTIURE_ID]];
|
|
vec4 diffuse = texture(sampler2D(diffuse_handle), vs_out.vsUV.xy);
|
|
|
|
if(diffuse[3] <= 0.1)
|
|
{
|
|
discard;
|
|
}
|
|
|
|
vec3 normal = texture(sampler2D(normal_handle), vs_out.vsUV.xy).xyz;
|
|
vec3 metal_rough = texture(sampler2D(metal_rough_handle), vs_out.vsUV.xy).xyz;
|
|
vec3 world_pos = texture(sampler2D(world_pos_handle), vs_out.vsUV.xy).xyz;
|
|
|
|
float rough = metal_rough[1];
|
|
float metal = metal_rough[2];
|
|
float ao = 1;
|
|
vec3 ambient = vec3(0.05) * diffuse.xyz * ao;
|
|
vec3 Lo = ambient;
|
|
for(int i = 0; i < ubo_per_frame.light_count; i ++)
|
|
{
|
|
mat4 model = model_matrix[lights[i].entity_id];
|
|
mat3 rot_mat = GetRotationOnlyMatrix(model);
|
|
vec3 light_direction = normalize(rot_mat * vec3(0,0,1));
|
|
|
|
vec3 light_pos = model[3].xyz;
|
|
if(lights[i].light_type == HYDRA_LIGHT_DIRECTIONAL)
|
|
{
|
|
Lo += DirectionalShading(normal, diffuse.xyz, rough, metal, lights[i].intensity, light_direction, light_pos, world_pos, ubo_per_frame.viewer_pos);
|
|
Lo *= lights[i].diffuse.xyz;
|
|
if(lights[i].shadow_caster == 1)
|
|
{
|
|
vec3 shadow = CalculateDirectionalShadow(vec4(world_pos, 1.0), lights[i].shadow_map_id, normal, light_direction, ubo_per_frame.viewer_pos);
|
|
Lo = Lo * shadow;
|
|
|
|
}
|
|
}
|
|
else if(lights[i].light_type == HYDRA_LIGHT_POINT)
|
|
{
|
|
float shadow = 0;
|
|
if(lights[i].shadow_caster == 1)
|
|
{
|
|
float view_to_frag = length(light_pos - ubo_per_frame.viewer_pos );
|
|
shadow = CalculatePointShadow(world_pos, i, view_to_frag, light_pos);
|
|
}
|
|
|
|
Lo += PointShading(normal,
|
|
diffuse.xyz,
|
|
rough,
|
|
metal,
|
|
lights[i].intensity,
|
|
light_pos,
|
|
lights[i].constant,
|
|
lights[i].linear,
|
|
lights[i].quadratic,
|
|
world_pos,
|
|
ubo_per_frame.viewer_pos,
|
|
shadow);
|
|
|
|
}
|
|
else if(lights[i].light_type == HYDRA_LIGHT_SPOT)
|
|
{
|
|
float shadow = 0;
|
|
if(lights[i].shadow_caster == 1)
|
|
{
|
|
// float distance = length(light_pos - world_pos);
|
|
shadow = CalculateSpotShadow(vec4(world_pos, 1.0),
|
|
lights[i].shadow_map_id,
|
|
normal,
|
|
light_direction,
|
|
ubo_per_frame.viewer_pos);
|
|
}
|
|
Lo += SpotShading(normal,
|
|
diffuse.xyz,
|
|
rough,
|
|
metal,
|
|
lights[i].intensity,
|
|
light_direction,
|
|
light_pos,
|
|
lights[i].cutoff,
|
|
lights[i].cutoff_outer,
|
|
lights[i].constant,
|
|
lights[i].linear,
|
|
lights[i].quadratic,
|
|
world_pos,
|
|
ubo_per_frame.viewer_pos,
|
|
shadow) * lights[i].diffuse.xyz;
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
float lighting = 0;
|
|
vec3 output_color = Lo;
|
|
|
|
// HDR tonemapping
|
|
output_color = output_color / (output_color + vec3(1.0));
|
|
// gamma correct
|
|
output_color = pow(output_color, vec3(1.0/2.1));
|
|
|
|
uFragColor = vec4(output_color, 1.0);
|
|
// float light = dot(lights[0].light_direction, normal);
|
|
|
|
// uFragColor = vec4(diffuse.xyz * light,1);
|
|
|
|
// uFragColor = vec4(normal, 1);
|
|
}
|
|
|
|
|