multiSpotLightF.glsl
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上传日期:2021-03-01
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- /**
- * @file multiSpotLightF.glsl
- *
- * Copyright (c) 2007-$CurrentYear$, Linden Research, Inc.
- * $License$
- */
- #version 120
- #extension GL_ARB_texture_rectangle : enable
- uniform sampler2DRect diffuseRect;
- uniform sampler2DRect specularRect;
- uniform sampler2DRect depthMap;
- uniform sampler2DRect normalMap;
- uniform samplerCube environmentMap;
- uniform sampler2D noiseMap;
- uniform sampler2D lightFunc;
- uniform sampler2D projectionMap;
- uniform mat4 proj_mat; //screen space to light space
- uniform float proj_near; //near clip for projection
- uniform vec3 proj_p; //plane projection is emitting from (in screen space)
- uniform vec3 proj_n;
- uniform float proj_focus; //distance from plane to begin blurring
- uniform float proj_lod; //(number of mips in proj map)
- uniform float proj_range; //range between near clip and far clip plane of projection
- uniform float proj_ambiance;
- uniform float near_clip;
- uniform float far_clip;
- uniform vec3 proj_origin; //origin of projection to be used for angular attenuation
- uniform float sun_wash;
- varying vec4 vary_light;
- varying vec4 vary_fragcoord;
- uniform vec2 screen_res;
- uniform mat4 inv_proj;
- vec4 getPosition(vec2 pos_screen)
- {
- float depth = texture2DRect(depthMap, pos_screen.xy).a;
- vec2 sc = pos_screen.xy*2.0;
- sc /= screen_res;
- sc -= vec2(1.0,1.0);
- vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
- vec4 pos = inv_proj * ndc;
- pos /= pos.w;
- pos.w = 1.0;
- return pos;
- }
- void main()
- {
- vec4 frag = vary_fragcoord;
- frag.xyz /= frag.w;
- frag.xyz = frag.xyz*0.5+0.5;
- frag.xy *= screen_res;
-
- vec3 pos = getPosition(frag.xy).xyz;
- vec3 lv = vary_light.xyz-pos.xyz;
- float dist2 = dot(lv,lv);
- dist2 /= vary_light.w;
- if (dist2 > 1.0)
- {
- discard;
- }
-
- vec3 norm = texture2DRect(normalMap, frag.xy).xyz*2.0-1.0;
-
- norm = normalize(norm);
- float l_dist = -dot(lv, proj_n);
-
- vec4 proj_tc = (proj_mat * vec4(pos.xyz, 1.0));
- if (proj_tc.z < 0.0)
- {
- discard;
- }
-
- proj_tc.xyz /= proj_tc.w;
-
- float fa = gl_Color.a+1.0;
- float dist_atten = clamp(1.0-(dist2-1.0*(1.0-fa))/fa, 0.0, 1.0);
-
- lv = proj_origin-pos.xyz;
- lv = normalize(lv);
- float da = dot(norm, lv);
-
- vec3 col = vec3(0,0,0);
-
- vec3 diff_tex = texture2DRect(diffuseRect, frag.xy).rgb;
-
- float noise = texture2D(noiseMap, frag.xy/128.0).b;
- if (proj_tc.z > 0.0 &&
- proj_tc.x < 1.0 &&
- proj_tc.y < 1.0 &&
- proj_tc.x > 0.0 &&
- proj_tc.y > 0.0)
- {
- float lit = 0.0;
- if (da > 0.0)
- {
- float diff = clamp((l_dist-proj_focus)/proj_range, 0.0, 1.0);
- float lod = diff * proj_lod;
-
- vec4 plcol = texture2DLod(projectionMap, proj_tc.xy, lod);
-
- vec3 lcol = gl_Color.rgb * plcol.rgb * plcol.a;
-
- lit = da * dist_atten * noise;
-
- col = lcol*lit*diff_tex;
- }
-
- float diff = clamp((proj_range-proj_focus)/proj_range, 0.0, 1.0);
- float lod = diff * proj_lod;
- vec4 amb_plcol = texture2DLod(projectionMap, proj_tc.xy, lod);
- //float amb_da = mix(proj_ambiance, proj_ambiance*max(-da, 0.0), max(da, 0.0));
- float amb_da = proj_ambiance;
-
- amb_da += (da*da*0.5+0.5)*proj_ambiance;
-
- amb_da *= dist_atten * noise;
-
- amb_da = min(amb_da, 1.0-lit);
-
- col += amb_da*gl_Color.rgb*diff_tex.rgb*amb_plcol.rgb*amb_plcol.a;
- }
-
-
- vec4 spec = texture2DRect(specularRect, frag.xy);
- if (spec.a > 0.0)
- {
- vec3 ref = reflect(normalize(pos), norm);
-
- //project from point pos in direction ref to plane proj_p, proj_n
- vec3 pdelta = proj_p-pos;
- float ds = dot(ref, proj_n);
-
- if (ds < 0.0)
- {
- vec3 pfinal = pos + ref * dot(pdelta, proj_n)/ds;
-
- vec3 stc = (proj_mat * vec4(pfinal.xyz, 1.0)).xyz;
- if (stc.z > 0.0)
- {
- stc.xy /= stc.z+proj_near;
-
- if (stc.x < 1.0 &&
- stc.y < 1.0 &&
- stc.x > 0.0 &&
- stc.y > 0.0)
- {
- vec4 scol = texture2DLod(projectionMap, stc.xy, proj_lod-spec.a*proj_lod);
- col += dist_atten*scol.rgb*gl_Color.rgb*scol.a*spec.rgb;
- }
- }
- }
- }
-
- /*if (spec.a > 0.0)
- {
- //vec3 ref = reflect(normalize(pos), norm);
- float sa = dot(normalize(lv-normalize(pos)),norm);;
- //sa = max(sa, 0.0);
- //sa = pow(sa, 128.0 * spec.a*spec.a/dist_atten)*min(dist_atten*4.0, 1.0);
- sa = texture2D(lightFunc, vec2(sa, spec.a)).a * min(dist_atten*4.0, 1.0);
- sa *= noise;
- col += da*sa*lcol*spec.rgb;
- }*/
-
- gl_FragColor.rgb = col;
- gl_FragColor.a = 0.0;
- }