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49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
#ifndef UTIL_MATRIX_H
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#define UTIL_MATRIX_H
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#include <wayland-server-protocol.h>
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struct wlr_box;
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/** Writes the identity matrix into mat */
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void wlr_matrix_identity(float mat[static 9]);
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/** mat ← a × b */
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void wlr_matrix_multiply(float mat[static 9], const float a[static 9],
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const float b[static 9]);
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/** Writes a 2D translation matrix to mat of magnitude (x, y) */
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void wlr_matrix_translate(float mat[static 9], float x, float y);
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/** Writes a 2D scale matrix to mat of magnitude (x, y) */
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void wlr_matrix_scale(float mat[static 9], float x, float y);
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/** Writes a transformation matrix which applies the specified
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* wl_output_transform to mat */
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void wlr_matrix_transform(float mat[static 9],
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enum wl_output_transform transform);
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/** Shortcut for the various matrix operations involved in projecting the
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* specified wlr_box onto a given orthographic projection with a given
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* rotation. The result is written to mat, which can be applied to each
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* coordinate of the box to get a new coordinate from [-1,1]. */
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void wlr_matrix_project_box(float mat[static 9], const struct wlr_box *box,
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enum wl_output_transform transform, const float projection[static 9]);
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/**
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* Writes a 2D orthographic projection matrix to mat of (width, height) with a
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* specified wl_output_transform.
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*
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* Equivalent to glOrtho(0, width, 0, height, 1, -1) with the transform applied.
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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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/**
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* Compute the inverse of a matrix.
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*
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* The matrix needs to be inversible.
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*/
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void matrix_invert(float out[static 9], float m[static 9]);
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#endif
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