388 lines
12 KiB
GLSL
388 lines
12 KiB
GLSL
#include "model_fs.glsl"
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#include "light.glsl"
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#include "brdf.glsl"
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#include "sh_lighting.glsl"
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#include "lightmap.glsl"
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#ifdef SHADING_PHONG
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void main() {
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vec3 n = normalize(v_normal_ws);
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vec4 lit = vec4(1.0, 1.0, 1.0, 1.0);
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// SH lighting
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if (!u_texlit) {
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vec3 result = sh_lighting(n);
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if( (result.x*result.x+result.y*result.y+result.z*result.z) > 0.0 ) lit = vec4(result, 1.0);
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}
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// analytical lights
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lit += vec4(lighting(), 0.0);
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// base
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vec4 diffuse;
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if(u_matcaps) {
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vec2 muv = vec2(view * vec4(v_normal_ws, 0))*0.5+vec2(0.5,0.5); // normal (model space) to view space
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diffuse = texture(u_texture2d, vec2(muv.x, 1.0-muv.y));
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} else if(u_textured) {
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diffuse = texture(u_texture2d, v_texcoord);
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} else {
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diffuse = u_diffuse; // * v_color;
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}
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diffuse *= v_color;
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if (u_texlit) {
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vec4 litsample = texture(u_lightmap, v_texcoord);
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if (u_texmod) {
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diffuse *= litsample;
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} else {
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diffuse += litsample;
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}
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diffuse.rgb += sh_lighting(n);
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}
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// lighting mix
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fragcolor = diffuse * lit * shadowing();
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// rimlight
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#ifdef RIM
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{
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vec3 n = normalize(mat3(M) * v_normal); // convert normal to view space
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vec3 p = (M * vec4(v_position,1.0)).xyz; // convert position to view space
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vec3 v = vec3(0,-1,0);
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if (!u_rimambient) {
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v = normalize(u_rimpivot-p);
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}
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float rim = 1.0 - max(dot(v,n), 0.0);
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vec3 col = u_rimcolor*(pow(smoothstep(1.0-u_rimrange.x,u_rimrange.y,rim), u_rimrange.z));
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fragcolor += vec4(col, 0.0);
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}
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#endif
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}
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#endif
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#ifdef SHADING_VERTEXLIT
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void main() {
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vec3 n = normalize(v_normal_ws);
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vec4 lit = vec4(1.0, 1.0, 1.0, 1.0);
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// SH lighting
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if (!u_texlit) {
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vec3 result = sh_lighting(n);
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if( (result.x*result.x+result.y*result.y+result.z*result.z) > 0.0 ) lit = vec4(result, 1.0);
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}
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lit += vec4(v_vertcolor, 0.0);
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// base
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vec4 diffuse;
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if(u_matcaps) {
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vec2 muv = vec2(view * vec4(v_normal_ws, 0))*0.5+vec2(0.5,0.5); // normal (model space) to view space
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diffuse = texture(u_texture2d, vec2(muv.x, 1.0-muv.y));
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} else if(u_textured) {
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diffuse = texture(u_texture2d, v_texcoord);
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} else {
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diffuse = u_diffuse; // * v_color;
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}
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// vec4 vertcolor4 = vec4(v_vertcolor, 1.0);
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// if (length(diffuse*v_color) > length(vertcolor4)) {
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diffuse *= v_color;
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// }
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if (u_texlit) {
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vec4 litsample = texture(u_lightmap, v_texcoord);
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if (u_texmod) {
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diffuse *= litsample;
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} else {
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diffuse += litsample;
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}
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diffuse.rgb += sh_lighting(n);
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}
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// lighting mix
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fragcolor = diffuse * lit * shadowing();
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// rimlight
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#ifdef RIM
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{
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vec3 n = normalize(mat3(M) * v_normal); // convert normal to view space
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vec3 p = (M * vec4(v_position,1.0)).xyz; // convert position to view space
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vec3 v = vec3(0,-1,0);
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if (!u_rimambient) {
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v = normalize(u_rimpivot-p);
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}
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float rim = 1.0 - max(dot(v,n), 0.0);
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vec3 col = u_rimcolor*(pow(smoothstep(1.0-u_rimrange.x,u_rimrange.y,rim), u_rimrange.z));
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fragcolor += vec4(col, 0.0);
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}
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#endif
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}
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#endif
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#ifdef SHADING_PBR
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void main(void)
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{
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vec3 baseColor = vec3( 0.5, 0.5, 0.5 );
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float roughness = 1.0;
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float metallic = 0.0;
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float ao = 1.0;
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float alpha = 1.0;
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vec4 baseColor_alpha;
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if ( map_albedo.has_tex )
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baseColor_alpha = sample_colormap( map_albedo, v_texcoord );
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else
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baseColor_alpha = sample_colormap( map_diffuse, v_texcoord );
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baseColor = baseColor_alpha.xyz;
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alpha = baseColor_alpha.w;
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if( map_metallic.has_tex && map_roughness.has_tex ) {
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metallic = sample_colormap( map_metallic, v_texcoord ).x;
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roughness = sample_colormap( map_roughness, v_texcoord ).x;
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}
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else if( map_roughness.has_tex ) {
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//< @r-lyeh, metalness B, roughness G, (@todo: self-shadowing occlusion R; for now, any of R/B are metallic)
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metallic = sample_colormap( map_roughness, v_texcoord ).b;// + sample_colormap( map_roughness, v_texcoord ).r;
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roughness = sample_colormap( map_roughness, v_texcoord ).g;
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}
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if ( map_ao.has_tex )
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ao = sample_colormap( map_ao, v_texcoord ).x;
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else if ( map_ambient.has_tex )
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ao = sample_colormap( map_ambient, v_texcoord ).x;
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vec3 emissive = sample_colormap( map_emissive, v_texcoord ).rgb;
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vec3 normalmap = texture( map_normals_tex, v_texcoord ).xyz * vec3(2.0) - vec3(1.0);
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float normalmap_mip = textureQueryLod( map_normals_tex, v_texcoord ).x;
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float normalmap_length = length(normalmap);
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normalmap /= normalmap_length;
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vec3 normal = v_normal_ws;
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if ( map_normals.has_tex )
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{
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// Mikkelsen's tangent space normal map decoding. See http://mikktspace.com/ for rationale.
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vec3 bi = cross( v_normal_ws, v_tangent );
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vec3 nmap = normalmap.xyz;
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normal = nmap.x * v_tangent + nmap.y * bi + nmap.z * v_normal_ws;
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}
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normal = normalize( normal );
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if( USE_MAP_DEBUGGING && !USE_AMBIENT_DEBUGGING )
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{
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vec3 c = vec3(1., 0., 0.);
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float x = gl_FragCoord.x / resolution.x;
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float y = gl_FragCoord.y / resolution.y;
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if ( y < (7.0/7.0) ) c = vec3(.5) + .5*v_normal_ws;
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if ( y < (6.0/7.0) ) c = vec3(.5) + .5*normalmap;
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if ( y < (5.0/7.0) ) c = vec3(ao);
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if ( y < (4.0/7.0) ) c = vec3(emissive);
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if ( y < (3.0/7.0) ) c = vec3(metallic);
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if ( y < (2.0/7.0) ) c = vec3(roughness);
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if ( y < (1.0/7.0) ) c = baseColor;
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fragcolor = vec4(c, 1.);
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return;
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}
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if (USE_NORMAL_VARIATION_TO_ROUGHNESS)
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{
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// Try to reduce specular aliasing by increasing roughness when minified normal maps have high variation.
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float variation = 1. - pow( normalmap_length, 8. );
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float minification = clamp( normalmap_mip - 2., 0., 1. );
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roughness = mix( roughness, 1.0, variation * minification );
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}
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fragcolor = baseColor_alpha;
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vec3 N = normal;
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vec3 V = normalize( v_to_camera );
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vec3 Lo = vec3(0.);
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vec3 F0 = vec3(0.04);
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F0 = mix( F0, baseColor, metallic );
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bool use_ibl = has_tex_skysphere;
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// use_ibl = false;
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// Add contributions from analytic lights.
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{
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for ( int i = 0; i < u_num_lights; i++ )
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{
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light_t l = u_lights[i];
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vec3 lightDir;
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float attenuation = 1.0;
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if (l.type == LIGHT_DIRECTIONAL) {
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lightDir = normalize(-l.dir);
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} else if (l.type == LIGHT_POINT || l.type == LIGHT_SPOT) {
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vec3 toLight = l.pos - v_position_ws;
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lightDir = normalize(toLight);
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float distance = length(toLight);
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attenuation = 1.0 / (l.constant + l.linear * distance + l.quadratic * (distance * distance));
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if (l.type == LIGHT_SPOT) {
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float angle = dot(l.dir, -lightDir);
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if (angle > l.outerCone) {
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float intensity = (angle-l.outerCone)/(l.innerCone-l.outerCone);
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attenuation *= clamp(intensity, 0.0, 1.0);
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} else {
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attenuation = 0.0;
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}
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}
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}
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// fast-rejection for faraway vertices
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if (attenuation <= 0.01) {
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continue;
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}
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vec3 radiance = l.diffuse * BOOST_LIGHTING;
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vec3 L = normalize( lightDir );
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vec3 H = normalize( V + L );
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vec3 F = fresnel_schlick( H, V, F0 );
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vec3 kS = F;
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vec3 kD = vec3(1.0) - kS;
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kD *= 1.0 - metallic;
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// Premultiplied alpha applied to the diffuse component only
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kD *= alpha;
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float D = distribution_ggx( N, H, roughness );
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float G = geometry_smith( N, V, L, roughness );
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vec3 num = D * F * G;
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float denom = 4. * max( 0., dot( N, V ) ) * max( 0., dot( N, L ) );
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vec3 specular = kS * (num / max( 0.001, denom ));
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float NdotL = max( 0., dot( N, L ) );
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Lo += ( kD * ( baseColor / PI ) + specular ) * radiance * NdotL * attenuation;
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}
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}
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vec3 ambient = sample_colormap( map_ambient, v_texcoord ).xyz;
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vec3 diffuse_ambient;
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vec3 specular_ambient;
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if ( use_ibl )
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{
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// Image based lighting.
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// Based on https://learnopengl.com/PBR/IBL/Diffuse-irradiance
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vec3 irradiance = vec3(0.);
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if ( USE_BRUTEFORCE_IRRADIANCE )
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{
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irradiance = sample_irradiance_slow( normal, v_tangent );
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}
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else
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{
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irradiance = sample_irradiance_fast( normal, v_tangent );
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}
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// Compute the Fresnel term for a perfect mirror reflection with L = R.
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// In this case the halfway vector H = N.
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//
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// We use a modified Fresnel function that dampens specular reflections of very
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// rough surfaces to avoid too bright pixels at grazing angles.
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vec3 F = fresnel_schlick_roughness( N, V, F0, roughness );
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vec3 kS = F;
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// Subtract the amount of reflected light (specular) to get the energy left for
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// absorbed (diffuse) light.
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vec3 kD = vec3(1.) - kS;
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// Metallic surfaces have only a specular reflection.
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kD *= 1.0 - metallic;
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// Premultiplied alpha applied to the diffuse component only
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kD *= alpha;
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// Modulate the incoming lighting with the diffuse color: some wavelengths get absorbed.
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diffuse_ambient = irradiance * baseColor;
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// Ambient light also has a specular part.
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specular_ambient = specular_ibl( V, normal, roughness, F );
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// Ambient occlusion tells us the fraction of sky light that reaches this point.
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if (USE_SPECULAR_AO_ATTENUATION)
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{
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ambient = ao * (kD * diffuse_ambient + specular_ambient);
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}
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else
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{
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// We don't attenuate specular_ambient ambient here with AO which might cause flickering in dark cavities.
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ambient = ao * (kD * diffuse_ambient) + specular_ambient;
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}
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}
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vec3 color = (ambient + Lo) + emissive;
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if ( USE_AMBIENT_DEBUGGING )
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{
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float y = gl_FragCoord.y / resolution.y;
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if( USE_MAP_DEBUGGING && y > 0.5 )
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{
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if ( (y-0.5) < (7.0/7.0/2.0) ) color = vec3(.5) + .5*v_normal_ws;
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if ( (y-0.5) < (6.0/7.0/2.0) ) color = vec3(.5) + .5*normalmap;
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if ( (y-0.5) < (5.0/7.0/2.0) ) color = vec3(ao);
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if ( (y-0.5) < (4.0/7.0/2.0) ) color = vec3(emissive);
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if ( (y-0.5) < (3.0/7.0/2.0) ) color = vec3(metallic);
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if ( (y-0.5) < (2.0/7.0/2.0) ) color = vec3(roughness);
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if ( (y-0.5) < (1.0/7.0/2.0) ) color = baseColor;
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} else {
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float x = gl_FragCoord.x / resolution.x;
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if ( x < 0.33 )
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color = specular_ambient;
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else if( x > 0.66 )
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color = diffuse_ambient;
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}
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}
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// dither with noise.
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// float dither = random( uvec3( floatBitsToUint( gl_FragCoord.xy ), frame_count ) );
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// color += BOOST_NOISE * vec3( (-1.0/256.) + (2./256.) * dither );
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#if 0 // original
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// basic tonemap and gamma correction
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color = color / ( vec3(1.) + color );
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color = pow( color, vec3(1. / 2.2) );
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#elif 0
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// filmic tonemapper
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vec3 linearColor = color;
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vec3 x = max(vec3(0.0), linearColor - 0.004);
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color = (x * (6.2 * x + 0.5)) / (x * (6.2 * x + 1.7) + 0.06);
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// gamma correction
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// color = pow( color, vec3(1. / 2.2) );
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#elif 0
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// aces film (CC0, src: https://knarkowicz.wordpress.com/2016/01/06/aces-filmic-tone-mapping-curve/)
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vec3 x = color;
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float a = 2.51f;
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float b = 0.03f;
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float c = 2.43f;
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float d = 0.59f;
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float e = 0.14f;
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color = clamp((x*(a*x+b))/(x*(c*x+d)+e), 0.0, 1.0);
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// gamma correction
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#endif
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// color = pow( color, vec3(1. / 2.2) );
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// Technically this alpha may be too transparent, if there is a lot of reflected light we wouldn't
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// see the background, maybe we can approximate it well enough by adding a fresnel term
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fragcolor = vec4( color * shadowing().xyz, alpha );
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}
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#endif
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