Exploring raycasters and possibly make a little "doom like" game based on it.
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raycaster/assets/shaders/ui_error.frag

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uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_duration;
uniform float u_time;
uniform float u_time_end;
uniform sampler2D texture;
uniform bool is_shape;
void main() {
if(is_shape) {
vec4 color = vec4(1.0, 0.0, 0.0, 1.0);
gl_FragColor = gl_Color * color;
} else {
vec4 pixel = texture2D(texture, gl_TexCoord[0].xy);
vec4 color = vec4(1.0, 0.0, 0.0, 1.0);
gl_FragColor = gl_Color * color * pixel;
}
}