1 | /* Copyright Torus Knot Software Ltd 2012-2014 |
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2 | |
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3 | Permission is hereby granted, free of charge, to any person obtaining a copy |
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4 | of this software and associated documentation files (the "Software"), to deal |
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5 | in the Software without restriction, including without limitation the rights |
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6 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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7 | copies of the Software, and to permit persons to whom the Software is |
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8 | furnished to do so, subject to the following conditions: |
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9 | |
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10 | The above copyright notice and this permission notice shall be included in |
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11 | all copies or substantial portions of the Software. |
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12 | |
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13 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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14 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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15 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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16 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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17 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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18 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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19 | THE SOFTWARE. |
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20 | |
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21 | Adapted by Matias N. Goldberg (Dark Sylinc) to GLSL based on the Cg file shadows.cg |
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22 | */ |
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23 | |
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24 | #version 300 es |
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25 | precision mediump int; |
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26 | precision mediump float; |
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27 | |
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28 | // Simple PCF |
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29 | // Number of samples in one dimension (square for total samples) |
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30 | #define NUM_SHADOW_SAMPLES_1D 2.0 |
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31 | #define SHADOW_FILTER_SCALE 1.0 |
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32 | |
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33 | #define SHADOW_SAMPLES NUM_SHADOW_SAMPLES_1D*NUM_SHADOW_SAMPLES_1D |
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34 | |
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35 | vec4 offsetSample(vec4 uv, vec2 offset, float invMapSize) |
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36 | { |
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37 | return vec4(uv.xy + offset * invMapSize * uv.w, uv.z, uv.w); |
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38 | } |
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39 | |
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40 | float calcDepthShadow(sampler2DShadow shadowMap, vec4 uv, float invShadowMapSize) |
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41 | { |
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42 | // 4-sample PCF |
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43 | |
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44 | float shadow = 0.0; |
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45 | float offset = (NUM_SHADOW_SAMPLES_1D/2.0 - 0.5) * SHADOW_FILTER_SCALE; |
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46 | for (float y = -offset; y <= offset; y += SHADOW_FILTER_SCALE) |
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47 | for (float x = -offset; x <= offset; x += SHADOW_FILTER_SCALE) |
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48 | { |
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49 | float depth = textureProj(shadowMap, offsetSample(uv, vec2(x, y), invShadowMapSize)); |
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50 | if (depth >= 1.0 || depth >= uv.z) |
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51 | shadow += 1.0; |
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52 | } |
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53 | |
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54 | shadow /= SHADOW_SAMPLES; |
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55 | |
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56 | return shadow; |
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57 | } |
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58 | |
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59 | |
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60 | float calcSimpleShadow(sampler2DShadow shadowMap, vec4 shadowMapPos) |
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61 | { |
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62 | return textureProj(shadowMap, shadowMapPos); |
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63 | } |
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64 | |
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65 | float calcPSSMDepthShadow(sampler2DShadow shadowMap0, sampler2DShadow shadowMap1, sampler2DShadow shadowMap2, |
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66 | vec4 lsPos0, vec4 lsPos1, vec4 lsPos2, |
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67 | float invShadowmapSize0, float invShadowmapSize1, float invShadowmapSize2, |
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68 | vec4 pssmSplitPoints, float camDepth) |
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69 | { |
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70 | |
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71 | float shadow; |
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72 | vec4 splitColour; |
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73 | // calculate shadow |
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74 | if (camDepth <= pssmSplitPoints.y) |
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75 | { |
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76 | splitColour = vec4(0.3, 0.0, 0, 0); |
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77 | shadow = calcDepthShadow(shadowMap0, lsPos0, invShadowmapSize0); |
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78 | } |
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79 | else if (camDepth <= pssmSplitPoints.z) |
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80 | { |
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81 | splitColour = vec4(0, 0.3, 0, 0); |
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82 | shadow = calcDepthShadow(shadowMap1, lsPos1, invShadowmapSize1); |
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83 | } |
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84 | else |
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85 | { |
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86 | splitColour = vec4(0.0, 0.0, 0.3, 0); |
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87 | shadow = calcDepthShadow(shadowMap2, lsPos2, invShadowmapSize2); |
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88 | } |
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89 | |
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90 | return shadow; |
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91 | } |
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92 | |
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93 | float calcPSSMSimpleShadow(sampler2DShadow shadowMap0, sampler2DShadow shadowMap1, sampler2DShadow shadowMap2, |
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94 | vec4 lsPos0, vec4 lsPos1, vec4 lsPos2, |
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95 | vec4 pssmSplitPoints, float camDepth) |
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96 | { |
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97 | |
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98 | float shadow; |
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99 | vec4 splitColour; |
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100 | // calculate shadow |
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101 | if (camDepth <= pssmSplitPoints.y) |
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102 | { |
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103 | splitColour = vec4(0.3, 0.0, 0, 0); |
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104 | shadow = calcSimpleShadow(shadowMap0, lsPos0); |
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105 | } |
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106 | else if (camDepth <= pssmSplitPoints.z) |
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107 | { |
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108 | splitColour = vec4(0, 0.3, 0, 0); |
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109 | shadow = calcSimpleShadow(shadowMap1, lsPos1); |
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110 | } |
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111 | else |
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112 | { |
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113 | splitColour = vec4(0.0, 0.0, 0.3, 0); |
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114 | shadow = calcSimpleShadow(shadowMap2, lsPos2); |
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115 | } |
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116 | |
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117 | return shadow; |
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118 | } |
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119 | |
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120 | |
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121 | |
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122 | vec3 calcPSSMDebugShadow(sampler2DShadow shadowMap0, sampler2DShadow shadowMap1, sampler2DShadow shadowMap2, |
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123 | vec4 lsPos0, vec4 lsPos1, vec4 lsPos2, |
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124 | float invShadowmapSize0, float invShadowmapSize1, float invShadowmapSize2, |
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125 | vec4 pssmSplitPoints, float camDepth) |
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126 | { |
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127 | |
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128 | vec4 splitColour; |
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129 | // calculate shadow |
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130 | if (camDepth <= pssmSplitPoints.y) |
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131 | { |
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132 | //splitColour = vec4(0.3, 0.0, 0, 0); |
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133 | //splitColour = lsPos0 / lsPos0.w; |
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134 | splitColour.rgb = vec3(textureProj(shadowMap0, lsPos0)); |
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135 | } |
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136 | else if (camDepth <= pssmSplitPoints.z) |
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137 | { |
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138 | //splitColour = vec4(0, 0.3, 0, 0); |
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139 | //splitColour = lsPos1 / lsPos1.w; |
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140 | splitColour.rgb = vec3(textureProj(shadowMap1, lsPos1)); |
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141 | } |
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142 | else |
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143 | { |
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144 | //splitColour = vec4(0.0, 0.0, 0.3, 0); |
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145 | //splitColour = lsPos2 / lsPos2.w; |
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146 | splitColour.rgb = vec3(textureProj(shadowMap2, lsPos2)); |
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147 | } |
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148 | |
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149 | return splitColour.rgb; |
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150 | } |
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