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Provide user with transformation matrix

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This commit is contained in:
Scott Anderson 2017-06-07 16:43:57 +12:00
parent 6f5c70ac69
commit 53dd622263
3 changed files with 77 additions and 48 deletions
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67
types/wlr_output.c
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@ -1,9 +1,70 @@
#include <stdlib.h>
#include <string.h>
#include <tgmath.h>
#include <wayland-server.h>
#include <wlr/types.h>
#include <wlr/common/list.h>
#include "types.h"
static const float transforms[][4] = {
[WL_OUTPUT_TRANSFORM_NORMAL] = {
1.0f, 0.0f,
0.0f, 1.0f,
},
[WL_OUTPUT_TRANSFORM_90] = {
0.0f, -1.0f,
1.0f, 0.0f,
},
[WL_OUTPUT_TRANSFORM_180] = {
-1.0f, 0.0f,
0.0f, -1.0f,
},
[WL_OUTPUT_TRANSFORM_270] = {
0.0f, 1.0f,
-1.0f, 0.0f,
},
[WL_OUTPUT_TRANSFORM_FLIPPED] = {
-1.0f, 0.0f,
0.0f, 1.0f,
},
[WL_OUTPUT_TRANSFORM_FLIPPED_90] = {
0.0f, 1.0f,
1.0f, 0.0f,
},
[WL_OUTPUT_TRANSFORM_FLIPPED_180] = {
1.0f, 0.0f,
0.0f, -1.0f,
},
[WL_OUTPUT_TRANSFORM_FLIPPED_270] = {
0.0f, -1.0f,
-1.0f, 0.0f,
},
};
// Equivilent to glOrtho(0, width, 0, height, 1, -1) with the transform applied
static void set_matrix(float mat[static 16], int32_t width, int32_t height,
enum wl_output_transform transform) {
memset(mat, 0, sizeof(*mat) * 16);
const float *t = transforms[transform];
float x = 2.0f / width;
float y = 2.0f / height;
// Rotation + relection
mat[0] = x * t[0];
mat[1] = x * t[1];
mat[4] = y * t[2];
mat[5] = y * t[3];
// Translation
mat[3] = -copysign(1.0f, mat[0] + mat[1]);
mat[7] = -copysign(1.0f, mat[4] + mat[5]);
// Identity
mat[10] = 1.0f;
mat[15] = 1.0f;
}
struct wlr_output *wlr_output_create(struct wlr_output_impl *impl,
struct wlr_output_state *state) {
struct wlr_output *output = calloc(1, sizeof(struct wlr_output));
@ -20,19 +81,21 @@ void wlr_output_enable(struct wlr_output *output, bool enable) {
}
bool wlr_output_set_mode(struct wlr_output *output, struct wlr_output_mode *mode) {
set_matrix(output->transform_matrix, mode->width, mode->height, output->transform);
return output->impl->set_mode(output->state, mode);
}
void wlr_output_transform(struct wlr_output *output,
enum wl_output_transform transform) {
set_matrix(output->transform_matrix, output->width, output->height, transform);
output->impl->transform(output->state, transform);
}
void wlr_output_destroy(struct wlr_output *output) {
if (!output) return;
output->impl->destroy(output->state);
if (output->make) free(output->make);
if (output->model) free(output->model);
free(output->make);
free(output->model);
for (size_t i = 0; output->modes && i < output->modes->length; ++i) {
free(output->modes->items[i]);
}