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Update/merge examples back into main repo (#192)

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Chris Dill
2023-08-25 08:08:32 +01:00
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parent fa682b00ac
commit bcdf8cec5b
320 changed files with 57965 additions and 1 deletions
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Examples/resources/shaders/glsl100/palette_switch.fs Normal file
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#version 100
precision mediump float;
const int colors = 8;
// Input vertex attributes (from vertex shader)
varying vec2 fragTexCoord;
varying vec4 fragColor;
// Input uniform values
uniform sampler2D texture0;
uniform ivec3 palette[colors];
void main()
{
// Texel color fetching from texture sampler
vec4 texelColor = texture2D(texture0, fragTexCoord)*fragColor;
// Convert the (normalized) texel color RED component (GB would work, too)
// to the palette index by scaling up from [0, 1] to [0, 255].
int index = int(texelColor.r*255.0);
ivec3 color = ivec3(0);
// NOTE: On GLSL 100 we are not allowed to index a uniform array by a variable value,
// a constantmust be used, so this logic...
if (index == 0) color = palette[0];
else if (index == 1) color = palette[1];
else if (index == 2) color = palette[2];
else if (index == 3) color = palette[3];
else if (index == 4) color = palette[4];
else if (index == 5) color = palette[5];
else if (index == 6) color = palette[6];
else if (index == 7) color = palette[7];
// Calculate final fragment color. Note that the palette color components
// are defined in the range [0, 255] and need to be normalized to [0, 1]
// for OpenGL to work.
gl_FragColor = vec4(float(color.x)/255.0, float(color.y)/255.0, float(color.z)/255.0, texelColor.a);
}