shader lighting example

Author: electronstudio

examples/shaders/resources/fudesumi.png

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+#version 100
+
+precision mediump float;
+
+// Input vertex attributes (from vertex shader)
+varying vec2 fragTexCoord;
+varying vec4 fragColor;
+
+// Input uniform values
+uniform sampler2D texture0;
+uniform vec4 colDiffuse;
+
+// NOTE: Add here your custom variables
+uniform vec2 resolution = vec2(800, 450);
+
+void main()
+{
+    // Texel color fetching from texture sampler
+    vec4 texelColor = texture2D(texture0, fragTexCoord);
+    
+    // NOTE: Implement here your fragment shader code
+    
+    gl_FragColor = texelColor*colDiffuse;
+}

examples/shaders/resources/shaders/glsl100/base.fs

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+#version 100
+
+// Input vertex attributes
+attribute vec3 vertexPosition;
+attribute vec2 vertexTexCoord;
+attribute vec3 vertexNormal;
+attribute vec4 vertexColor;
+
+// Input uniform values
+uniform mat4 mvp;
+
+// Output vertex attributes (to fragment shader)
+varying vec2 fragTexCoord;
+varying vec4 fragColor;
+
+// NOTE: Add here your custom variables 
+
+void main()
+{
+    // Send vertex attributes to fragment shader
+    fragTexCoord = vertexTexCoord;
+    fragColor = vertexColor;
+    
+    // Calculate final vertex position
+    gl_Position = mvp*vec4(vertexPosition, 1.0);
+}

examples/shaders/resources/shaders/glsl100/base.vs

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+#version 100
+
+precision mediump float;
+
+// Input vertex attributes (from vertex shader)
+varying vec2 fragTexCoord;
+varying vec4 fragColor;
+
+// Input uniform values
+uniform sampler2D texture0;
+uniform vec4 colDiffuse;
+
+// NOTE: Add here your custom variables
+
+const vec2 size = vec2(800, 450);   // render size
+const float samples = 5.0;          // pixels per axis; higher = bigger glow, worse performance
+const float quality = 2.5; 	        // lower = smaller glow, better quality
+
+void main()
+{
+    vec4 sum = vec4(0);
+    vec2 sizeFactor = vec2(1)/size*quality;
+
+    // Texel color fetching from texture sampler
+    vec4 source = texture2D(texture0, fragTexCoord);
+
+    const int range = 2;            // should be = (samples - 1)/2;
+
+    for (int x = -range; x <= range; x++)
+    {
+        for (int y = -range; y <= range; y++)
+        {
+            sum += texture2D(texture0, fragTexCoord + vec2(x, y)*sizeFactor);
+        }
+    }
+
+    // Calculate final fragment color
+    gl_FragColor = ((sum/(samples*samples)) + source)*colDiffuse;
+}

examples/shaders/resources/shaders/glsl100/bloom.fs

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+#version 100
+
+precision mediump float;
+
+// Input vertex attributes (from vertex shader)
+varying vec2 fragTexCoord;
+varying vec4 fragColor;
+
+// Input uniform values
+uniform sampler2D texture0;
+uniform vec4 colDiffuse;
+
+// NOTE: Add here your custom variables
+
+// NOTE: Render size values must be passed from code
+const float renderWidth = 800.0;
+const float renderHeight = 450.0;
+
+vec3 offset = vec3(0.0, 1.3846153846, 3.2307692308);
+vec3 weight = vec3(0.2270270270, 0.3162162162, 0.0702702703);
+
+void main() 
+{ 
+    // Texel color fetching from texture sampler
+    vec3 tc = texture2D(texture0, fragTexCoord).rgb*weight.x;
+    
+    tc += texture2D(texture0, fragTexCoord + vec2(offset.y)/renderWidth, 0.0).rgb*weight.y;
+    tc += texture2D(texture0, fragTexCoord - vec2(offset.y)/renderWidth, 0.0).rgb*weight.y;
+    
+    tc += texture2D(texture0, fragTexCoord + vec2(offset.z)/renderWidth, 0.0).rgb*weight.z;
+    tc += texture2D(texture0, fragTexCoord - vec2(offset.z)/renderWidth, 0.0).rgb*weight.z;
+
+    gl_FragColor = vec4(tc, 1.0);
+}

examples/shaders/resources/shaders/glsl100/blur.fs

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+# version 100
+
+precision mediump float;
+
+// Input vertex attributes (from vertex shader)
+varying vec2 fragTexCoord;
+varying vec4 fragColor;
+
+// Input uniform values
+uniform sampler2D texture0;
+uniform vec4 colDiffuse;
+
+// NOTE: Add here your custom variables
+
+float hatchOffsetY = 5.0;
+float lumThreshold01 = 0.9;
+float lumThreshold02 = 0.7;
+float lumThreshold03 = 0.5;
+float lumThreshold04 = 0.3;
+
+void main() 
+{
+    vec3 tc = vec3(1.0, 1.0, 1.0);
+    float lum = length(texture2D(texture0, fragTexCoord).rgb);
+
+    if (lum < lumThreshold01) 
+    {
+        if (mod(gl_FragCoord.x + gl_FragCoord.y, 10.0) == 0.0) tc = vec3(0.0, 0.0, 0.0);
+    }  
+
+    if (lum < lumThreshold02) 
+    {
+        if (mod(gl_FragCoord .x - gl_FragCoord .y, 10.0) == 0.0) tc = vec3(0.0, 0.0, 0.0);
+    }  
+
+    if (lum < lumThreshold03) 
+    {
+        if (mod(gl_FragCoord .x + gl_FragCoord .y - hatchOffsetY, 10.0) == 0.0) tc = vec3(0.0, 0.0, 0.0);
+    }  
+
+    if (lum < lumThreshold04) 
+    {
+        if (mod(gl_FragCoord .x - gl_FragCoord .y - hatchOffsetY, 10.0) == 0.0) tc = vec3(0.0, 0.0, 0.0);
+    }
+
+    gl_FragColor = vec4(tc, 1.0);
+}

examples/shaders/resources/shaders/glsl100/cross_hatching.fs

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+# version 100
+
+precision mediump float;
+
+// Input vertex attributes (from vertex shader)
+varying vec2 fragTexCoord;
+varying vec4 fragColor;
+
+// Input uniform values
+uniform sampler2D texture0;
+uniform vec4 colDiffuse;
+
+// NOTE: Add here your custom variables
+
+// NOTE: Render size values must be passed from code
+const float renderWidth = 800.0;
+const float renderHeight = 450.0;
+
+float stitchingSize = 6.0;
+int invert = 0;
+
+vec4 PostFX(sampler2D tex, vec2 uv)
+{
+    vec4 c = vec4(0.0);
+    float size = stitchingSize;
+    vec2 cPos = uv * vec2(renderWidth, renderHeight);
+    vec2 tlPos = floor(cPos / vec2(size, size));
+    tlPos *= size;
+
+    int remX = int(mod(cPos.x, size));
+    int remY = int(mod(cPos.y, size));
+    
+    if (remX == 0 && remY == 0) tlPos = cPos;
+    
+    vec2 blPos = tlPos;
+    blPos.y += (size - 1.0);
+    
+    if ((remX == remY) || (((int(cPos.x) - int(blPos.x)) == (int(blPos.y) - int(cPos.y)))))
+    {
+        if (invert == 1) c = vec4(0.2, 0.15, 0.05, 1.0);
+        else c = texture2D(tex, tlPos * vec2(1.0/renderWidth, 1.0/renderHeight)) * 1.4;
+    }
+    else
+    {
+        if (invert == 1) c = texture2D(tex, tlPos * vec2(1.0/renderWidth, 1.0/renderHeight)) * 1.4;
+        else c = vec4(0.0, 0.0, 0.0, 1.0);
+    }
+    
+    return c;
+}
+
+void main()
+{
+    vec3 tc = PostFX(texture0, fragTexCoord).rgb;
+
+    gl_FragColor = vec4(tc, 1.0);
+}

examples/shaders/resources/shaders/glsl100/cross_stitching.fs

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+#version 100
+
+precision mediump float;
+
+// Input vertex attributes (from vertex shader)
+varying vec2 fragTexCoord;
+varying vec4 fragColor;
+
+// Custom variables
+#define PI 3.14159265358979323846
+uniform float uTime = 0.0;
+
+float divisions = 5.0;
+float angle = 0.0;
+
+vec2 VectorRotateTime(vec2 v, float speed)
+{
+    float time = uTime*speed;
+    float localTime = fract(time);  // The time domain this works on is 1 sec.
+    
+    if ((localTime >= 0.0) && (localTime < 0.25)) angle = 0.0;
+    else if ((localTime >= 0.25) && (localTime < 0.50)) angle = PI/4*sin(2*PI*localTime - PI/2);
+    else if ((localTime >= 0.50) && (localTime < 0.75)) angle = PI*0.25;
+    else if ((localTime >= 0.75) && (localTime < 1.00)) angle = PI/4*sin(2*PI*localTime);
+    
+    // Rotate vector by angle
+    v -= 0.5;
+    v =  mat2(cos(angle), -sin(angle), sin(angle), cos(angle))*v;
+    v += 0.5;
+    
+    return v;
+}
+
+float Rectangle(in vec2 st, in float size, in float fill) 
+{
+  float roundSize = 0.5 - size/2.0;
+  float left = step(roundSize, st.x);
+  float top = step(roundSize, st.y);
+  float bottom = step(roundSize, 1.0 - st.y);
+  float right = step(roundSize, 1.0 - st.x);
+
+  return (left*bottom*right*top)*fill;
+}
+
+void main()
+{ 
+    vec2 fragPos = fragTexCoord;
+    fragPos.xy += uTime/9.0;
+
+    fragPos *= divisions;
+    vec2 ipos = floor(fragPos);  // Get the integer coords
+    vec2 fpos = fract(fragPos);  // Get the fractional coords
+
+    fpos = VectorRotateTime(fpos, 0.2);
+    
+    float alpha = Rectangle(fpos, 0.216, 1.0);
+    vec3 color = vec3(0.3, 0.3, 0.3);
+
+    gl_FragColor = vec4(color, alpha);
+}

examples/shaders/resources/shaders/glsl100/cubes_panning.fs

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+#version 100
+
+precision mediump float;
+
+// Input vertex attributes (from vertex shader)
+varying vec2 fragTexCoord;
+varying vec4 fragColor;
+
+// Input uniform values
+uniform sampler2D texture0;     // Depth texture
+uniform vec4 colDiffuse;
+
+// NOTE: Add here your custom variables
+
+void main()
+{
+    float zNear = 0.01; // camera z near
+    float zFar = 10.0;  // camera z far
+    float z = texture2D(texture0, fragTexCoord).x;
+
+    // Linearize depth value
+    float depth = (2.0*zNear)/(zFar + zNear - z*(zFar - zNear));
+    
+    // Calculate final fragment color
+    gl_FragColor = vec4(depth, depth, depth, 1.0f);
+}

examples/shaders/resources/shaders/glsl100/depth.fs

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+#version 100
+
+precision mediump float;
+
+// Input vertex attributes (from vertex shader)
+varying vec2 fragTexCoord;
+
+// Input uniform values
+uniform sampler2D texture0;
+
+// NOTE: Default parameters for Oculus Rift DK2 device
+const vec2 LeftLensCenter = vec2(0.2863248, 0.5);
+const vec2 RightLensCenter = vec2(0.7136753, 0.5);
+const vec2 LeftScreenCenter = vec2(0.25, 0.5);
+const vec2 RightScreenCenter = vec2(0.75, 0.5);
+const vec2 Scale = vec2(0.25, 0.45);
+const vec2 ScaleIn = vec2(4.0, 2.5);
+const vec4 HmdWarpParam = vec4(1.0, 0.22, 0.24, 0.0);
+const vec4 ChromaAbParam = vec4(0.996, -0.004, 1.014, 0.0);
+
+void main()
+{
+    // The following two variables need to be set per eye
+    vec2 LensCenter = fragTexCoord.x < 0.5 ? LeftLensCenter : RightLensCenter;
+    vec2 ScreenCenter = fragTexCoord.x < 0.5 ? LeftScreenCenter : RightScreenCenter;
+    
+    // Scales input texture coordinates for distortion: vec2 HmdWarp(vec2 fragTexCoord, vec2 LensCenter)
+    vec2 theta = (fragTexCoord - LensCenter)*ScaleIn;   // Scales to [-1, 1]
+    float rSq = theta.x*theta.x + theta.y*theta.y;
+    vec2 theta1 = theta*(HmdWarpParam.x + HmdWarpParam.y*rSq + HmdWarpParam.z*rSq*rSq + HmdWarpParam.w*rSq*rSq*rSq);
+    //vec2 tc = LensCenter + Scale*theta1;
+    
+    // Detect whether blue texture coordinates are out of range since these will scaled out the furthest
+    vec2 thetaBlue = theta1*(ChromaAbParam.z + ChromaAbParam.w*rSq);
+    vec2 tcBlue = LensCenter + Scale*thetaBlue;
+
+    if (any(bvec2(clamp(tcBlue, ScreenCenter - vec2(0.25, 0.5), ScreenCenter + vec2(0.25, 0.5)) - tcBlue))) gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0);
+    else
+    {
+        // Do blue texture lookup
+        float blue = texture2D(texture0, tcBlue).b;
+
+        // Do green lookup (no scaling)
+        vec2 tcGreen = LensCenter + Scale*theta1;
+        float green = texture2D(texture0, tcGreen).g;
+
+        // Do red scale and lookup
+        vec2 thetaRed = theta1*(ChromaAbParam.x + ChromaAbParam.y*rSq);
+        vec2 tcRed = LensCenter + Scale*thetaRed;
+        float red = texture2D(texture0, tcRed).r;
+
+        gl_FragColor = vec4(red, green, blue, 1.0);
+    }
+}