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Merge pull request #453 from emersion/surface-transform

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Add surface transforms support
This commit is contained in:
Drew DeVault 2017-12-14 14:43:04 -05:00 • committed by GitHub
commit 23fb663ea4
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11 changed files with 114 additions and 75 deletions
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39
render/matrix.c
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@ -86,38 +86,55 @@ void wlr_matrix_mul(const float (*x)[16], const float (*y)[16], float (*product)
static const float transforms[][4] = {
[WL_OUTPUT_TRANSFORM_NORMAL] = {
1.0f, 0.0f,
0.0f, -1.0f,
0.0f, 1.0f,
},
[WL_OUTPUT_TRANSFORM_90] = {
0.0f, -1.0f,
-1.0f, 0.0f,
1.0f, 0.0f,
},
[WL_OUTPUT_TRANSFORM_180] = {
-1.0f, 0.0f,
0.0f, 1.0f,
0.0f, -1.0f,
},
[WL_OUTPUT_TRANSFORM_270] = {
0.0f, 1.0f,
1.0f, 0.0f,
-1.0f, 0.0f,
},
[WL_OUTPUT_TRANSFORM_FLIPPED] = {
-1.0f, 0.0f,
0.0f, -1.0f,
0.0f, 1.0f,
},
[WL_OUTPUT_TRANSFORM_FLIPPED_90] = {
0.0f, 1.0f,
0.0f, -1.0f,
-1.0f, 0.0f,
},
[WL_OUTPUT_TRANSFORM_FLIPPED_180] = {
1.0f, 0.0f,
0.0f, 1.0f,
0.0f, -1.0f,
},
[WL_OUTPUT_TRANSFORM_FLIPPED_270] = {
0.0f, -1.0f,
0.0f, 1.0f,
1.0f, 0.0f,
},
};
void wlr_matrix_transform(float mat[static 16],
enum wl_output_transform transform) {
memset(mat, 0, sizeof(*mat) * 16);
const float *t = transforms[transform];
// Rotation + reflection
mat[0] = t[0];
mat[1] = t[1];
mat[4] = t[2];
mat[5] = t[3];
// Identity
mat[10] = 1.0f;
mat[15] = 1.0f;
}
// Equivilent to glOrtho(0, width, 0, height, 1, -1) with the transform applied
void wlr_matrix_texture(float mat[static 16], int32_t width, int32_t height,
enum wl_output_transform transform) {
@ -127,11 +144,11 @@ void wlr_matrix_texture(float mat[static 16], int32_t width, int32_t height,
float x = 2.0f / width;
float y = 2.0f / height;
// Rotation + relection
// Rotation + reflection
mat[0] = x * t[0];
mat[1] = x * t[1];
mat[4] = y * t[2];
mat[5] = y * t[3];
mat[4] = y * -t[2];
mat[5] = y * -t[3];
// Translation
mat[3] = -copysign(1.0f, mat[0] + mat[1]);