1 #ifdef NO_SHADOW2DPROJ 2 #define SHADOWMAP sampler2D 3 #define SHADOWTEX texture2D 4 #define SHADCOORD(coord) coord.xy 5 #else 6 #define SHADOWMAP sampler2DShadow 7 #define SHADOWTEX shadow2D 8 #define SHADCOORD(coord) vec3(coord.xy,0.0) 9 #endif 10 11 //float shadowDepth = texture2DProj(tex, projCoord); 12 13 const float texSize = 1024.0; 14 const float pixSize = 1.0 / texSize; 15 const vec2 pixSize2 = vec2(pixSize); 16 17 float Shadow_DoShadowCompareOffset(in SHADOWMAP tex, vec4 projCoord, vec2 offset){ 18 return step(projCoord.z, SHADOWTEX(tex, SHADCOORD(projCoord.xy + offset * pixSize2)).r); 19 } 20 21 float Shadow_DoShadowCompare(in SHADOWMAP tex, vec4 projCoord){ 22 return step(projCoord.z, SHADOWTEX(tex, SHADCOORD(projCoord.xy)).r); 23 } 24 25 float Shadow_BorderCheck(in vec2 coord){ 26 // Very slow method (uses 24 instructions) 27 //if (coord.x >= 1.0) 28 // return 1.0; 29 //else if (coord.x <= 0.0) 30 // return 1.0; 31 //else if (coord.y >= 1.0) 32 // return 1.0; 33 //else if (coord.y <= 0.0) 34 // return 1.0; 35 //else 36 // return 0.0; 37 38 // Fastest, "hack" method (uses 4-5 instructions) 39 vec4 t = vec4(coord.xy, 0.0, 1.0); 40 t = step(t.wwxy, t.xyzz); 41 return dot(t,t); 42 } 43 44 float Shadow_DoDither_2x2(in SHADOWMAP tex, in vec4 projCoord){ 45 float shadow = 0.0; 46 vec2 o = mod(floor(gl_FragCoord.xy), 2.0); 47 shadow += Shadow_DoShadowCompareOffset(tex,projCoord,vec2(-1.5, 1.5) + o); 48 shadow += Shadow_DoShadowCompareOffset(tex,projCoord,vec2( 0.5, 1.5) + o); 49 shadow += Shadow_DoShadowCompareOffset(tex,projCoord,vec2(-1.5, -0.5) + o); 50 shadow += Shadow_DoShadowCompareOffset(tex,projCoord,vec2( 0.5, -0.5) + o); 51 shadow *= 0.25 ; 52 return shadow; 53 } 54 55 float Shadow_DoBilinear(in SHADOWMAP tex, in vec4 projCoord){ 56 const vec2 size = vec2(256.0); 57 const vec2 pixel = vec2(1.0) / vec2(256.0); 58 59 vec2 tc = projCoord.xy * size; 60 vec2 bl = fract(tc); 61 vec2 dn = floor(tc) * pixel; 62 vec2 up = dn + pixel; 63 64 vec4 coord = vec4(dn.xy, projCoord.zw); 65 float s_00 = Shadow_DoShadowCompare(tex, coord); 66 s_00 = clamp(s_00, 0.0, 1.0); 67 68 coord = vec4(up.x, dn.y, projCoord.zw); 69 float s_10 = Shadow_DoShadowCompare(tex, coord); 70 s_10 = clamp(s_10, 0.0, 1.0); 71 72 coord = vec4(dn.x, up.y, projCoord.zw); 73 float s_01 = Shadow_DoShadowCompare(tex, coord); 74 s_01 = clamp(s_01, 0.0, 1.0); 75 76 coord = vec4(up.xy, projCoord.zw); 77 float s_11 = Shadow_DoShadowCompare(tex, coord); 78 s_11 = clamp(s_11, 0.0, 1.0); 79 80 float xb0 = mix(s_00, s_10, clamp(bl.x, 0.0, 1.0)); 81 float xb1 = mix(s_01, s_11, clamp(bl.x, 0.0, 1.0)); 82 float yb = mix(xb0, xb1, clamp(bl.y, 0.0, 1.0)); 83 return yb; 84 } 85 86 float Shadow_DoPCF_2x2(in SHADOWMAP tex, in vec4 projCoord){ 87 88 float shadow = 0.0; 89 float x,y; 90 for (y = -1.5 ; y <=1.5 ; y+=1.0) 91 for (x = -1.5 ; x <=1.5 ; x+=1.0) 92 shadow += clamp(Shadow_DoShadowCompareOffset(tex,projCoord,vec2(x,y)) + 93 Shadow_BorderCheck(projCoord.xy), 94 0.0, 1.0); 95 96 shadow /= 16.0 ; 97 return shadow; 98 } 99 100 101 float Shadow_GetShadow(in SHADOWMAP tex, in vec4 projCoord){ 102 return clamp(Shadow_DoDither_2x2(tex, projCoord) + Shadow_BorderCheck(projCoord.xy), 0.0, 1.0); 103 } 104 105 106
