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gl/utils: fixup matrix math again for column major

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e4bf9ed8f0 was not quite right and changed
the wrong thing. Intead we needed to change the multiplication order
and should have kept the previous to/from matrices as is done in this
patch.
This commit is contained in:
Matthew Waters 2018-07-10 20:03:12 +10:00
parent 173e2d8db3
commit 16cba63d43
3 changed files with 65 additions and 36 deletions
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24
ext/gl/gstglutils.c
View file

@ -115,17 +115,17 @@ static const gfloat identity_matrix[] = {
};
static const gfloat from_ndc_matrix[] = {
0.5, 0.0, 0.0, 0.5,
0.0, 0.5, 0.0, 0.5,
0.0, 0.0, 0.5, 0.5,
0.0, 0.0, 0.0, 1.0,
0.5, 0.0, 0.0, 0.0,
0.0, 0.5, 0.0, 0.0,
0.0, 0.0, 0.5, 0.0,
0.5, 0.5, 0.5, 1.0,
};
static const gfloat to_ndc_matrix[] = {
2.0, 0.0, 0.0, -1.0,
0.0, 2.0, 0.0, -1.0,
0.0, 0.0, 2.0, -1.0,
0.0, 0.0, 0.0, 1.0,
2.0, 0.0, 0.0, 0.0,
0.0, 2.0, 0.0, 0.0,
0.0, 0.0, 2.0, 0.0,
-1.0, -1.0, -1.0, 1.0,
};
void
@ -161,8 +161,8 @@ void gst_gl_get_affine_transformation_meta_as_ndc_ext
} else {
float tmp[16];
gst_gl_multiply_matrix4 (to_ndc_matrix, meta->matrix, tmp);
gst_gl_multiply_matrix4 (tmp, from_ndc_matrix, matrix);
gst_gl_multiply_matrix4 (from_ndc_matrix, meta->matrix, tmp);
gst_gl_multiply_matrix4 (tmp, to_ndc_matrix, matrix);
}
}
@ -173,6 +173,6 @@ void gst_gl_set_affine_transformation_meta_from_ndc_ext
g_return_if_fail (meta != NULL);
gst_gl_multiply_matrix4 (from_ndc_matrix, matrix, tmp);
gst_gl_multiply_matrix4 (tmp, to_ndc_matrix, meta->matrix);
gst_gl_multiply_matrix4 (to_ndc_matrix, matrix, tmp);
gst_gl_multiply_matrix4 (tmp, from_ndc_matrix, meta->matrix);
}

24
gst-libs/gst/gl/gstglutils.c
View file

@ -793,17 +793,17 @@ static const gfloat identity_matrix[] = {
};
static const gfloat from_ndc_matrix[] = {
0.5, 0.0, 0.0, 0.5,
0.0, 0.5, 0.0, 0.5,
0.0, 0.0, 0.5, 0.5,
0.0, 0.0, 0.0, 1.0,
0.5, 0.0, 0.0, 0.0,
0.0, 0.5, 0.0, 0.0,
0.0, 0.0, 0.5, 0.0,
0.5, 0.5, 0.5, 1.0,
};
static const gfloat to_ndc_matrix[] = {
2.0, 0.0, 0.0, -1.0,
0.0, 2.0, 0.0, -1.0,
0.0, 0.0, 2.0, -1.0,
0.0, 0.0, 0.0, 1.0,
2.0, 0.0, 0.0, 0.0,
0.0, 2.0, 0.0, 0.0,
0.0, 0.0, 2.0, 0.0,
-1.0, -1.0, -1.0, 1.0,
};
/* multiplies two 4x4 matrices, @a X @b, and stores the result in @result
@ -856,8 +856,8 @@ gst_gl_get_affine_transformation_meta_as_ndc (GstVideoAffineTransformationMeta *
float tmp[16];
/* change of basis multiplications */
gst_gl_multiply_matrix4 (to_ndc_matrix, meta->matrix, tmp);
gst_gl_multiply_matrix4 (tmp, from_ndc_matrix, matrix);
gst_gl_multiply_matrix4 (from_ndc_matrix, meta->matrix, tmp);
gst_gl_multiply_matrix4 (tmp, to_ndc_matrix, matrix);
}
}
@ -869,6 +869,6 @@ void gst_gl_set_affine_transformation_meta_from_ndc
g_return_if_fail (meta != NULL);
/* change of basis multiplications */
gst_gl_multiply_matrix4 (from_ndc_matrix, matrix, tmp);
gst_gl_multiply_matrix4 (tmp, to_ndc_matrix, meta->matrix);
gst_gl_multiply_matrix4 (to_ndc_matrix, matrix, tmp);
gst_gl_multiply_matrix4 (tmp, from_ndc_matrix, meta->matrix);
}

53
tests/check/libs/gstglmatrix.c
View file

@ -137,7 +137,7 @@ GST_START_TEST (test_matrix_ndc)
}
GST_END_TEST;
#if 0
static void
transpose_matrix4 (float *m, float *res)
{
@ -148,6 +148,8 @@ transpose_matrix4 (float *m, float *res)
int idx = i + (j * 4);
int swapped_idx = j + (i * 4);
GST_ERROR ("swapping %i %f into %i", idx, m[idx], swapped_idx);
if (i == j)
fail_unless (idx == swapped_idx);
@ -155,7 +157,7 @@ transpose_matrix4 (float *m, float *res)
}
}
}
#endif
static float
dot4 (float *v1, float *v2)
{
@ -174,21 +176,22 @@ _matrix_mult_vertex4 (float *m, float *v, float *res)
res[3] = dot4 (&m[12], v);
}
#if 0
/* v * m */
/* Not the prevailing multiplication convention and not really used in
* GStreamer. Kept around for extra testing */
/* Used because the default is for OpenGL to read matrices transposed on
* uploading */
static void
_vertex_mult_matrix4 (float *v, float *m, float *res)
_vertex_mult_matrix4 (float *m, float *v, float *res)
{
float tmp[16] = { 0., };
GST_TRACE ("original matrix");
debug_matrix (m);
transpose_matrix4 (m, tmp);
GST_TRACE ("transposed matrix");
debug_matrix (tmp);
_matrix_mult_vertex4 (tmp, v, res);
}
#endif
GST_START_TEST (test_matrix_vertex_identity)
{
float identity[] = {
@ -202,7 +205,7 @@ GST_START_TEST (test_matrix_vertex_identity)
float res[4] = { 0., };
int i;
_matrix_mult_vertex4 (identity, v, res);
_vertex_mult_matrix4 (identity, v, res);
GST_DEBUG ("vertex: %" VEC4_FORMAT, VEC4_ARGS (v));
GST_DEBUG ("result: %" VEC4_FORMAT, VEC4_ARGS (res));
@ -228,7 +231,7 @@ GST_START_TEST (test_matrix_vertex_scale)
float res[4] = { 0., };
int i;
_matrix_mult_vertex4 (scale, v, res);
_vertex_mult_matrix4 (scale, v, res);
GST_DEBUG ("vertex: %" VEC4_FORMAT, VEC4_ARGS (v));
GST_DEBUG ("result: %" VEC4_FORMAT, VEC4_ARGS (res));
@ -241,6 +244,31 @@ GST_START_TEST (test_matrix_vertex_scale)
GST_END_TEST;
GST_START_TEST (test_matrix_vertex_translate)
{
float translate_1[] = {
1., 0., 0., 0.,
0., 1., 0., 0.,
0., 0., 1., 0.,
1., 2., 3., 1.,
};
float v[] = { 1., 1., 1., 1. };
float expected[] = { 2., 3., 4., 1. };
float res[4] = { 0., };
int i;
_vertex_mult_matrix4 (translate_1, v, res);
for (i = 0; i < 4; i++) {
fail_unless (FEQ (res[i], expected[i]),
"value %f at index %u does not match " "expected value %f", res[i], i,
expected[i]);
}
}
GST_END_TEST;
GST_START_TEST (test_matrix_vertex_y_invert)
{
GstBuffer *buffer = gst_buffer_new ();
@ -266,7 +294,7 @@ GST_START_TEST (test_matrix_vertex_y_invert)
GST_DEBUG ("y-invert");
debug_matrix (y_invert);
_matrix_mult_vertex4 (y_invert, v, res);
_vertex_mult_matrix4 (y_invert, v, res);
GST_DEBUG ("vertex: %" VEC4_FORMAT, VEC4_ARGS (v));
GST_DEBUG ("result: %" VEC4_FORMAT, VEC4_ARGS (res));
@ -283,7 +311,7 @@ GST_START_TEST (test_matrix_vertex_y_invert)
GST_DEBUG ("y-invert from ndc [-1,1]^3 to [0,1]^3");
debug_matrix (aff_meta->matrix);
_matrix_mult_vertex4 (aff_meta->matrix, v, res);
_vertex_mult_matrix4 (aff_meta->matrix, v, res);
GST_DEBUG ("vertex: %" VEC4_FORMAT, VEC4_ARGS (v));
GST_DEBUG ("result: %" VEC4_FORMAT, VEC4_ARGS (res));
@ -296,7 +324,7 @@ GST_START_TEST (test_matrix_vertex_y_invert)
/* test vec4(1,0,1,1) -> vec4(1,1,1,1) */
v[1] = 0.;
expected[1] = 1.;
_matrix_mult_vertex4 (aff_meta->matrix, v, res);
_vertex_mult_matrix4 (aff_meta->matrix, v, res);
GST_DEBUG ("vertex: %" VEC4_FORMAT, VEC4_ARGS (v));
GST_DEBUG ("result: %" VEC4_FORMAT, VEC4_ARGS (res));
@ -320,6 +348,7 @@ gst_gl_matrix_suite (void)
tcase_add_test (tc_chain, test_matrix_ndc);
tcase_add_test (tc_chain, test_matrix_vertex_identity);
tcase_add_test (tc_chain, test_matrix_vertex_scale);
tcase_add_test (tc_chain, test_matrix_vertex_translate);
tcase_add_test (tc_chain, test_matrix_vertex_y_invert);
return s;