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109 lines
2.4 KiB
C
109 lines
2.4 KiB
C
#include <string.h>
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#include <wayland-server-protocol.h>
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#include <wlr/util/box.h>
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#include "util/matrix.h"
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void matrix_multiply(float mat[static 9], const float a[static 9],
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const float b[static 9]) {
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float product[9];
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product[0] = a[0]*b[0] + a[1]*b[3] + a[2]*b[6];
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product[1] = a[0]*b[1] + a[1]*b[4] + a[2]*b[7];
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product[2] = a[0]*b[2] + a[1]*b[5] + a[2]*b[8];
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product[3] = a[3]*b[0] + a[4]*b[3] + a[5]*b[6];
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product[4] = a[3]*b[1] + a[4]*b[4] + a[5]*b[7];
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product[5] = a[3]*b[2] + a[4]*b[5] + a[5]*b[8];
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product[6] = a[6]*b[0] + a[7]*b[3] + a[8]*b[6];
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product[7] = a[6]*b[1] + a[7]*b[4] + a[8]*b[7];
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product[8] = a[6]*b[2] + a[7]*b[5] + a[8]*b[8];
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memcpy(mat, product, sizeof(product));
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}
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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, 1.0f,
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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, 1.0f,
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0.0f, -1.0f, 1.0f,
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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, 1.0f,
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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, 1.0f,
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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, 1.0f,
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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, 1.0f,
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-1.0f, 0.0f, 1.0f,
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0.0f, 0.0f, 1.0f,
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},
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};
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void matrix_transform(float mat[static 9],
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enum wl_output_transform transform) {
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matrix_multiply(mat, mat, transforms[transform]);
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}
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void matrix_projection(float mat[static 9], int width, int height) {
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struct wlr_fbox fbox = {
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.x = -1.0f,
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.y = -1.0f,
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.width = 2.0f / width,
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.height = 2.0f / height,
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};
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float trans[9];
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matrix_project_fbox(trans, &fbox);
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matrix_multiply(mat, trans, mat);
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}
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void matrix_project_fbox(float mat[static 9], const struct wlr_fbox *box) {
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mat[0] = box->width;
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mat[1] = 0.0f;
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mat[2] = box->x;
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mat[3] = 0.0f;
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mat[4] = box->height;
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mat[5] = box->y;
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mat[6] = 0.0f;
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mat[7] = 0.0f;
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mat[8] = 1.0f;
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}
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void matrix_project_box(float mat[static 9], const struct wlr_box *box) {
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struct wlr_fbox fbox = {
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.x = box->x,
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.y = box->y,
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.width = box->width,
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.height = box->height,
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};
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matrix_project_fbox(mat, &fbox);
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}
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