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util/matrix: Rotate around (.5, .5) with wlr_matrix_transform

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Before we would rotate around 0,0 which means that the content needed
to be scaled to -1, 1 to be transformed properly when we're usually
working in the 0, 1 range. Switch it around.

These matrices were precomputed by simply adding a -.5 -.5 translate
and back again with old transform in between.
This commit is contained in:
Alexander Orzechowski 2025-01-27 13:43:51 -05:00
parent c9d6339b60
commit 3a4bc44688
2 changed files with 8 additions and 12 deletions
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2
render/gles2/pass.c
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@ -139,7 +139,6 @@ static void set_tex_matrix(GLint loc, enum wl_output_transform trans,
wlr_matrix_identity(tex_matrix);
wlr_matrix_translate(tex_matrix, box->x, box->y);
wlr_matrix_scale(tex_matrix, box->width, box->height);
wlr_matrix_translate(tex_matrix, .5, .5);
// since textures have a different origin point we have to transform
// differently if we are rotating
@ -148,7 +147,6 @@ static void set_tex_matrix(GLint loc, enum wl_output_transform trans,
} else {
wlr_matrix_transform(tex_matrix, trans);
}
wlr_matrix_translate(tex_matrix, -.5, -.5);
glUniformMatrix3fv(loc, 1, GL_FALSE, tex_matrix);
}