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vo_opengl: fix precision loss of fruit dithering matrix 

With default setting, the matrix for fruit dithering requires 12 bits
precision (values from 0/4096 to 4095/4096). But 16-bit float
provides only 10 bits. In addition, when `dither-size-fruit=8` is
set, 16 bits are required from the texture format.

Fix this by attempting to use 16 bit integer texture first. This is
still not precise, but should be better than using a half float.
This commit is contained in:
Bin Jin 2015-12-08 22:22:08 +00:00 committed by wm4
parent 45ae0716be
commit 6d36c432ab
1 changed files with 9 additions and 2 deletions
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11
video/out/opengl/video.c
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@ -1736,9 +1736,16 @@ static void pass_dither(struct gl_video *p)
p->last_dither_matrix_size = size;
}
const struct fmt_entry *fmt = find_tex_format(gl, 2, 1);
tex_size = size;
tex_iformat = gl_float16_formats[0].internal_format;
tex_format = gl_float16_formats[0].format;
// Prefer R16 texture since they provide higher precision.
if (fmt->internal_format) {
tex_iformat = fmt->internal_format;
tex_format = fmt->format;
} else {
tex_iformat = gl_float16_formats[0].internal_format;
tex_format = gl_float16_formats[0].format;
}
tex_type = GL_FLOAT;
tex_data = p->last_dither_matrix;
} else {