237 lines
5.2 KiB
GLSL
237 lines
5.2 KiB
GLSL
/**
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* @file multiSpotLightF.glsl
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*
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* $LicenseInfo:firstyear=2007&license=viewerlgpl$
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* $/LicenseInfo$
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*/
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#extension GL_ARB_texture_rectangle : enable
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uniform sampler2DRect diffuseRect;
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uniform sampler2DRect specularRect;
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uniform sampler2DRect depthMap;
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uniform sampler2DRect normalMap;
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uniform samplerCube environmentMap;
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uniform sampler2DRect lightMap;
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uniform sampler2D noiseMap;
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uniform sampler2D lightFunc;
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uniform sampler2D projectionMap;
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uniform mat4 proj_mat; //screen space to light space
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uniform float proj_near; //near clip for projection
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uniform vec3 proj_p; //plane projection is emitting from (in screen space)
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uniform vec3 proj_n;
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uniform float proj_focus; //distance from plane to begin blurring
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uniform float proj_lod; //(number of mips in proj map)
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uniform float proj_range; //range between near clip and far clip plane of projection
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uniform float proj_ambient_lod;
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uniform float proj_ambiance;
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uniform float near_clip;
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uniform float far_clip;
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uniform vec3 proj_origin; //origin of projection to be used for angular attenuation
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uniform float sun_wash;
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uniform int proj_shadow_idx;
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uniform float shadow_fade;
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varying vec4 vary_light;
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varying vec4 vary_fragcoord;
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uniform vec2 screen_res;
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uniform mat4 inv_proj;
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vec4 texture2DLodSpecular(sampler2D projectionMap, vec2 tc, float lod)
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{
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vec4 ret = texture2DLod(projectionMap, tc, lod);
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vec2 dist = tc-vec2(0.5);
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float det = max(1.0-lod/(proj_lod*0.5), 0.0);
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float d = dot(dist,dist);
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ret *= min(clamp((0.25-d)/0.25, 0.0, 1.0)+det, 1.0);
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return ret;
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}
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vec4 texture2DLodDiffuse(sampler2D projectionMap, vec2 tc, float lod)
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{
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vec4 ret = texture2DLod(projectionMap, tc, lod);
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vec2 dist = vec2(0.5) - abs(tc-vec2(0.5));
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float det = min(lod/(proj_lod*0.5), 1.0);
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float d = min(dist.x, dist.y);
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float edge = 0.25*det;
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ret *= clamp(d/edge, 0.0, 1.0);
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return ret;
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}
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vec4 texture2DLodAmbient(sampler2D projectionMap, vec2 tc, float lod)
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{
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vec4 ret = texture2DLod(projectionMap, tc, lod);
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vec2 dist = tc-vec2(0.5);
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float d = dot(dist,dist);
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ret *= min(clamp((0.25-d)/0.25, 0.0, 1.0), 1.0);
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return ret;
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}
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vec4 getPosition(vec2 pos_screen)
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{
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float depth = texture2DRect(depthMap, pos_screen.xy).r;
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vec2 sc = pos_screen.xy*2.0;
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sc /= screen_res;
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sc -= vec2(1.0,1.0);
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vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
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vec4 pos = inv_proj * ndc;
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pos /= pos.w;
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pos.w = 1.0;
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return pos;
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}
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void main()
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{
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vec4 frag = vary_fragcoord;
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frag.xyz /= frag.w;
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frag.xyz = frag.xyz*0.5+0.5;
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frag.xy *= screen_res;
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vec3 pos = getPosition(frag.xy).xyz;
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vec3 lv = vary_light.xyz-pos.xyz;
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float dist2 = dot(lv,lv);
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dist2 /= vary_light.w;
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if (dist2 > 1.0)
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{
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discard;
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}
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float shadow = 1.0;
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if (proj_shadow_idx >= 0)
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{
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vec4 shd = texture2DRect(lightMap, frag.xy);
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float sh[2];
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sh[0] = shd.b;
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sh[1] = shd.a;
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shadow = min(sh[proj_shadow_idx]+shadow_fade, 1.0);
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}
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vec3 norm = texture2DRect(normalMap, frag.xy).xyz;
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norm = vec3((norm.xy-0.5)*2.0,norm.z); // unpack norm
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norm = normalize(norm);
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float l_dist = -dot(lv, proj_n);
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vec4 proj_tc = (proj_mat * vec4(pos.xyz, 1.0));
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if (proj_tc.z < 0.0)
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{
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discard;
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}
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proj_tc.xyz /= proj_tc.w;
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float fa = gl_Color.a+1.0;
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float dist_atten = min(1.0-(dist2-1.0*(1.0-fa))/fa, 1.0);
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if (dist_atten <= 0.0)
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{
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discard;
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}
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lv = proj_origin-pos.xyz;
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lv = normalize(lv);
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float da = dot(norm, lv);
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vec3 col = vec3(0,0,0);
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vec3 diff_tex = texture2DRect(diffuseRect, frag.xy).rgb;
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float noise = texture2D(noiseMap, frag.xy/128.0).b;
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if (proj_tc.z > 0.0 &&
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proj_tc.x < 1.0 &&
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proj_tc.y < 1.0 &&
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proj_tc.x > 0.0 &&
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proj_tc.y > 0.0)
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{
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float lit = 0.0;
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float amb_da = proj_ambiance;
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if (da > 0.0)
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{
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float diff = clamp((l_dist-proj_focus)/proj_range, 0.0, 1.0);
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float lod = diff * proj_lod;
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vec4 plcol = texture2DLodDiffuse(projectionMap, proj_tc.xy, lod);
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vec3 lcol = gl_Color.rgb * plcol.rgb * plcol.a;
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lit = da * dist_atten * noise;
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col = lcol*lit*diff_tex*shadow;
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amb_da += (da*0.5)*(1.0-shadow)*proj_ambiance;
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}
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//float diff = clamp((proj_range-proj_focus)/proj_range, 0.0, 1.0);
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vec4 amb_plcol = texture2DLodAmbient(projectionMap, proj_tc.xy, proj_lod);
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amb_da += (da*da*0.5+0.5)*proj_ambiance;
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amb_da *= dist_atten * noise;
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amb_da = min(amb_da, 1.0-lit);
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col += amb_da*gl_Color.rgb*diff_tex.rgb*amb_plcol.rgb*amb_plcol.a;
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}
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vec4 spec = texture2DRect(specularRect, frag.xy);
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if (spec.a > 0.0)
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{
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vec3 ref = reflect(normalize(pos), norm);
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//project from point pos in direction ref to plane proj_p, proj_n
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vec3 pdelta = proj_p-pos;
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float ds = dot(ref, proj_n);
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if (ds < 0.0)
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{
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vec3 pfinal = pos + ref * dot(pdelta, proj_n)/ds;
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vec4 stc = (proj_mat * vec4(pfinal.xyz, 1.0));
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if (stc.z > 0.0)
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{
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stc.xy /= stc.w;
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float fatten = clamp(spec.a*spec.a+spec.a*0.5, 0.25, 1.0);
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stc.xy = (stc.xy - vec2(0.5)) * fatten + vec2(0.5);
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if (stc.x < 1.0 &&
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stc.y < 1.0 &&
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stc.x > 0.0 &&
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stc.y > 0.0)
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{
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vec4 scol = texture2DLodSpecular(projectionMap, stc.xy, proj_lod-spec.a*proj_lod);
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col += dist_atten*scol.rgb*gl_Color.rgb*scol.a*spec.rgb*shadow;
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}
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}
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}
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}
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gl_FragColor.rgb = col;
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gl_FragColor.a = 0.0;
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}
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