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backend: gl: fix shadow from mask

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The intermediate texture used for shadow from mask calculation did not
properly set the min/mag filter to linear, which is required by the blur
methods. Because they use texture interpolation to accelerate
the convolution calculation.

Fixes #916

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
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Yuxuan Shui 2022-11-11 15:51:11 +00:00
parent abea823f5d
commit 7d0d693ca7
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1 changed files with 2 additions and 0 deletions
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src/backend/gl/gl_common.c
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@ -1213,6 +1213,8 @@ void *gl_shadow_from_mask(backend_t *base, void *mask,
auto source_texture = gl_new_texture(GL_TEXTURE_2D);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, source_texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, new_inner->width, new_inner->height, 0,
GL_RED, GL_UNSIGNED_BYTE, NULL);
glBindTexture(GL_TEXTURE_2D, 0);