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Add example shaders_shapes_outline.c (#1883)

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GoldenThumbs 2021-07-18 16:45:13 -05:00 • committed by GitHub
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35
examples/shaders/resources/shaders/glsl100/outline.fs Normal file
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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;
uniform vec2 texScale;
// Function for drawing outlines on alpha-blended textures
vec4 DrawOutline(sampler2D tex, vec2 uv, vec2 lineScale, vec3 lineCol)
{
vec2 texelScale = 1.0 / lineScale;
vec4 center = texture2D(tex, uv); // We sample the center texel, (with all color data)
// Next we sample four corner texels, but only for the alpha channel (this is for the outline)
vec4 corners;
corners.x = texture2D(tex, uv+vec2( texelScale.x, texelScale.y)).a;
corners.y = texture2D(tex, uv+vec2( texelScale.x,-texelScale.y)).a;
corners.z = texture2D(tex, uv+vec2(-texelScale.x, texelScale.y)).a;
corners.w = texture2D(tex, uv+vec2(-texelScale.x,-texelScale.y)).a;
float outline = min(dot(corners, vec4(1.0)), 1.0);
vec4 col = mix(vec4(0.0), vec4(lineCol, 1.0), outline);
col = mix(col, center, center.a);
return col;
}
void main()
{
gl_FragColor = DrawOutline(texture0, fragTexCoord, texScale, vec3(0.0));
}

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examples/shaders/resources/shaders/glsl330/outline.fs Normal file
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#version 330
// Input vertex attributes (from vertex shader)
in vec2 fragTexCoord;
in vec4 fragColor;
// Input uniform values
uniform sampler2D texture0;
uniform vec4 colDiffuse;
uniform vec2 texScale;
// Output fragment color
out vec4 finalColor;
// Function for drawing outlines on alpha-blended textures
vec4 DrawOutline(sampler2D tex, vec2 uv, vec2 lineScale, vec3 lineCol)
{
vec2 texelScale = 1.0 / lineScale;
vec4 center = texture(tex, uv); // We sample the center texel, (with all color data)
// Next we sample four corner texels, but only for the alpha channel (this is for the outline)
vec4 corners;
corners.x = texture(tex, uv+vec2( texelScale.x, texelScale.y)).a;
corners.y = texture(tex, uv+vec2( texelScale.x,-texelScale.y)).a;
corners.z = texture(tex, uv+vec2(-texelScale.x, texelScale.y)).a;
corners.w = texture(tex, uv+vec2(-texelScale.x,-texelScale.y)).a;
float outline = min(dot(corners, vec4(1.0)), 1.0);
vec4 col = mix(vec4(0.0), vec4(lineCol, 1.0), outline);
col = mix(col, center, center.a);
return col;
}
void main()
{
finalColor = DrawOutline(texture0, fragTexCoord, texScale, vec3(0.0));
}