38 lines
730 B
GLSL
38 lines
730 B
GLSL
#version 110
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uniform mat4 matrix_in;
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attribute vec4 a_position;
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attribute vec2 a_texcoord;
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varying vec2 ove_texcoord;
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uniform vec2 footage_in_resolution;
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uniform vec2 ove_resolution;
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mat4 scale_mat4(vec3 scale) {
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return mat4(
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scale.x, 0.0, 0.0, 0.0,
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0.0, scale.y, 0.0, 0.0,
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0.0, 0.0, scale.z, 0.0,
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0.0, 0.0, 0.0, 1.0
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);
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}
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void main() {
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// Create identity matrix
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mat4 transform = mat4(1.0);
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// Scale to square
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transform *= scale_mat4(vec3(1.0/ove_resolution, 1.0));
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// Multiply by received matrix
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transform *= matrix_in;
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// Scale back out to footage size
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transform *= scale_mat4(vec3(footage_in_resolution, 1.0));
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gl_Position = transform * a_position;
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ove_texcoord = a_texcoord;
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}
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