71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
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#include <math.h>
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#include <string.h>
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#include <wlr/types/wlr_output.h>
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#include "sway/desktop/fx_renderer/matrix.h"
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static const float transforms[][9] = {
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[WL_OUTPUT_TRANSFORM_NORMAL] = {
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1.0f, 0.0f, 0.0f,
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0.0f, 1.0f, 0.0f,
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0.0f, 0.0f, 1.0f,
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},
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[WL_OUTPUT_TRANSFORM_90] = {
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0.0f, 1.0f, 0.0f,
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-1.0f, 0.0f, 0.0f,
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0.0f, 0.0f, 1.0f,
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},
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[WL_OUTPUT_TRANSFORM_180] = {
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-1.0f, 0.0f, 0.0f,
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0.0f, -1.0f, 0.0f,
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0.0f, 0.0f, 1.0f,
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},
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[WL_OUTPUT_TRANSFORM_270] = {
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0.0f, -1.0f, 0.0f,
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1.0f, 0.0f, 0.0f,
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0.0f, 0.0f, 1.0f,
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},
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[WL_OUTPUT_TRANSFORM_FLIPPED] = {
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-1.0f, 0.0f, 0.0f,
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0.0f, 1.0f, 0.0f,
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0.0f, 0.0f, 1.0f,
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},
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[WL_OUTPUT_TRANSFORM_FLIPPED_90] = {
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0.0f, 1.0f, 0.0f,
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1.0f, 0.0f, 0.0f,
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0.0f, 0.0f, 1.0f,
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},
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[WL_OUTPUT_TRANSFORM_FLIPPED_180] = {
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1.0f, 0.0f, 0.0f,
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0.0f, -1.0f, 0.0f,
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0.0f, 0.0f, 1.0f,
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},
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[WL_OUTPUT_TRANSFORM_FLIPPED_270] = {
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0.0f, -1.0f, 0.0f,
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-1.0f, 0.0f, 0.0f,
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0.0f, 0.0f, 1.0f,
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},
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};
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void matrix_projection(float mat[static 9], int width, int height,
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enum wl_output_transform transform) {
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memset(mat, 0, sizeof(*mat) * 9);
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const float *t = transforms[transform];
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float x = 2.0f / width;
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float y = 2.0f / height;
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// Rotation + reflection
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mat[0] = x * t[0];
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mat[1] = x * t[1];
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mat[3] = y * -t[3];
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mat[4] = y * -t[4];
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// Translation
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mat[2] = -copysign(1.0f, mat[0] + mat[1]);
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mat[5] = -copysign(1.0f, mat[3] + mat[4]);
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// Identity
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mat[8] = 1.0f;
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}
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