1 | #version 100 |
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2 | |
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3 | precision mediump int; |
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4 | precision mediump float; |
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5 | |
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6 | float shadowPCF(sampler2D shadowMap, vec4 shadowMapPos, vec2 offset) |
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7 | { |
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8 | shadowMapPos = shadowMapPos / shadowMapPos.w; |
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9 | vec2 uv = shadowMapPos.xy; |
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10 | vec3 o = vec3(offset, -offset.x) * 0.3; |
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11 | |
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12 | // Note: We using 2x2 PCF. Good enough and is a lot faster. |
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13 | float c = (shadowMapPos.z <= texture2D(shadowMap, uv.xy - o.xy).r) ? 1.0 : 0.0; // top left |
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14 | c += (shadowMapPos.z <= texture2D(shadowMap, uv.xy + o.xy).r) ? 1.0 : 0.0; // bottom right |
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15 | c += (shadowMapPos.z <= texture2D(shadowMap, uv.xy + o.zy).r) ? 1.0 : 0.0; // bottom left |
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16 | c += (shadowMapPos.z <= texture2D(shadowMap, uv.xy - o.zy).r) ? 1.0 : 0.0; // top right |
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17 | |
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18 | return c / 4.0; |
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19 | } |
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20 | |
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21 | uniform vec4 lightPosition; // object space |
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22 | uniform vec3 eyePosition; // object space |
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23 | uniform mat4 worldViewProjMatrix; |
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24 | uniform mat4 texWorldViewProjMatrix0; |
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25 | uniform mat4 texWorldViewProjMatrix1; |
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26 | uniform mat4 texWorldViewProjMatrix2; |
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27 | |
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28 | varying vec4 oUv0; |
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29 | varying vec3 oLightDir; |
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30 | varying vec3 oHalfAngle; |
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31 | varying vec4 oLightPosition0; |
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32 | varying vec4 oLightPosition1; |
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33 | varying vec4 oLightPosition2; |
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34 | varying vec3 oNormal; |
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35 | |
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36 | attribute vec4 position; |
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37 | attribute vec3 normal; |
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38 | attribute vec4 uv0; |
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39 | |
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40 | void main() |
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41 | { |
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42 | // Calculate output position |
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43 | gl_Position = worldViewProjMatrix * position; |
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44 | |
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45 | // Pass the main uvs straight through unchanged |
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46 | oUv0.xy = uv0.xy; |
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47 | oUv0.z = gl_Position.z; |
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48 | |
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49 | // Calculate tangent space light vector |
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50 | // Get object space light direction |
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51 | oLightDir = normalize(lightPosition.xyz - (position * lightPosition.w).xyz); |
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52 | |
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53 | // Calculate half-angle in tangent space |
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54 | vec3 eyeDir = normalize(eyePosition - position.xyz); |
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55 | oHalfAngle = normalize(eyeDir + oLightDir); |
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56 | |
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57 | // Calculate the position of vertex in light space |
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58 | oLightPosition0 = texWorldViewProjMatrix0 * position; |
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59 | oLightPosition1 = texWorldViewProjMatrix1 * position; |
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60 | oLightPosition2 = texWorldViewProjMatrix2 * position; |
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61 | |
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62 | oNormal = normal; |
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63 | } |
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