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#version 430
layout (local_size_x = 16, local_size_y = 16) in;
// match the input texture format!
layout(rgba8, location=0) writeonly uniform image2D destTex;
uniform float time;
void main() {
// texel coordinate we are writing to
ivec2 texelPos = ivec2(gl_GlobalInvocationID.xy);
// Calculate 1.0 - distance from the center in each work group
float local = 1.0 - length(vec2(ivec2(gl_LocalInvocationID.xy) - 8) / 8.0);
// Wave covering the screen diagonally
float global = sin(float(gl_WorkGroupID.x + gl_WorkGroupID.y) * 0.1 + time) / 2.0 + 0.5;
imageStore(
destTex,
texelPos,
vec4(
local,
global,
0.0,
1.0
)
);
}
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