Add some comments to the shaders
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@ -1,4 +1,8 @@
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#version 300 es
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//FRAGMENT SHADER
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//
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// Basic fragment shader, just passes along colors, we don't do much
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// with textures or anything else complex in this project.
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precision highp float;
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@ -1,5 +1,10 @@
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#version 300 es
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//VERTEX SHADER
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//
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// Takes vertices of a unit cube, scales them up along Y according to
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// aHeight, and colors them with basic diffuse shading.
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#define CLEAR_COLOR vec4(0.0, 0.0, 0.0, 1.0)
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#define BASE_COLOR vec4(1.0, 1.0, 1.0, 1.0)
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#define AMBIENT_LIGHT vec3(0.3, 0.3, 0.3)
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#define LIGHT_DIRECTION normalize(vec3(0.85, 0.8, 0.75))
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@ -17,24 +22,28 @@ uniform mat4 uProjectionMatrix;
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uniform mat4 uNormalMatrix;
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void main() {
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// The X position of each vertex depends on its cube's instance;
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// they should align to the X axis.
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float instanceX =
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aVertexPosition.x + float(gl_InstanceID) * 2.0 * abs(aVertexPosition.x);
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float(gl_InstanceID * 2) * abs(aVertexPosition.x) + aVertexPosition.x;
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// Since we want to scale the boxes by their frequencies, make the Y
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// positions of any vertices that are > 0 (1, because this is a
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// cube) = the height of the frequency.
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float vertexY =
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aVertexPosition.y > 0.0 ? aVertexPosition.y * aHeight : aVertexPosition.y;
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gl_Position = uProjectionMatrix * uModelViewMatrix *
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vec4(instanceX, vertexY, aVertexPosition.zw);
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vec4 transformedNormal = uNormalMatrix * vec4(aVertexNormal, 1.0);
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float directionalLight =
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max(dot(transformedNormal.xyz, LIGHT_DIRECTION), 0.0);
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if (aHeight == 0.0) {
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vColor = vec4(0.0, 0.0, 0.0, 0.0);
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// Don't render cubes that don't currently have a height
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// (frequency = 0)
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vColor = CLEAR_COLOR;
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} else {
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// Properly shade and color any other cubes
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vec4 transformedNormal = uNormalMatrix * vec4(aVertexNormal, 1.0);
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float directionalLight =
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max(dot(transformedNormal.xyz, LIGHT_DIRECTION), 0.0);
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vColor = vec4(AMBIENT_LIGHT + (directionalLight * LIGHT_COLOR), 1.0);
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vColor = vec4(directionalLight * LIGHT_COLOR + AMBIENT_LIGHT, 1.0);
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}
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}
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