4226d56ca9
As of clang-format 6.0.1, putting the `/* clang-format off */` hint around our "invalid" `[vertex]` and `[shader]` statements isn't enough to prevent a bogus indent of the next comments and first valid statement, so we need to enclose that first valid statement in the unformatted chunk.
63 lines
1.3 KiB
GLSL
63 lines
1.3 KiB
GLSL
/* clang-format off */
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[vertex]
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layout(location = 0) in highp vec4 vertex_attrib;
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/* clang-format on */
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layout(location = 4) in vec2 uv_in;
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uniform float offset_x;
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out vec2 uv_interp;
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void main() {
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uv_interp = uv_in;
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gl_Position = vec4(vertex_attrib.x + offset_x, vertex_attrib.y, 0.0, 1.0);
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}
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/* clang-format off */
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[fragment]
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uniform sampler2D source; //texunit:0
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/* clang-format on */
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uniform vec2 eye_center;
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uniform float k1;
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uniform float k2;
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uniform float upscale;
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uniform float aspect_ratio;
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in vec2 uv_interp;
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layout(location = 0) out vec4 frag_color;
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void main() {
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vec2 coords = uv_interp;
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vec2 offset = coords - eye_center;
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// take aspect ratio into account
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offset.y /= aspect_ratio;
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// distort
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vec2 offset_sq = offset * offset;
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float radius_sq = offset_sq.x + offset_sq.y;
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float radius_s4 = radius_sq * radius_sq;
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float distortion_scale = 1.0 + (k1 * radius_sq) + (k2 * radius_s4);
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offset *= distortion_scale;
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// reapply aspect ratio
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offset.y *= aspect_ratio;
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// add our eye center back in
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coords = offset + eye_center;
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coords /= upscale;
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// and check our color
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if (coords.x < -1.0 || coords.y < -1.0 || coords.x > 1.0 || coords.y > 1.0) {
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frag_color = vec4(0.0, 0.0, 0.0, 1.0);
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} else {
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coords = (coords + vec2(1.0)) / vec2(2.0);
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frag_color = textureLod(source, coords, 0.0);
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}
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}
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