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compositor: simplify the matrix inversion API

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The compositor will likely do an order of magnitude less matrix
inversions than point transformations with an inverse, hence we do not
really need the optimised path for single-shot invert-and-transform.

Expose only the computing of the explicit inverse matrix in the API.

However, the matrix inversion tests need access to the internal
functions. Designate a unit test build by #defining UNIT_TEST, and
export the internal functions in that case.

Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>
This commit is contained in:
Pekka Paalanen
2012-01-20 10:47:57 +02:00
parent 1ef94c8742
commit d1f0ab6343
6 changed files with 81 additions and 67 deletions
Download Patch File Download Diff File Expand all files Collapse all files
tests/Makefile.am
+1 -1
View File
@@ -6,7 +6,7 @@ endif
AM_CFLAGS = $(GCC_CFLAGS)
AM_CPPFLAGS = -I../src
AM_CPPFLAGS = -I../src -DUNIT_TEST
matrix_test_SOURCES = \
matrix-test.c \
tests/matrix-test.c
+24 -36
View File
@@ -30,6 +30,11 @@
#include "matrix.h"
struct inverse_matrix {
double LU[16]; /* column-major */
unsigned perm[4]; /* permutation */
};
static struct timespec begin_time;
static void
@@ -81,9 +86,9 @@ determinant(const struct weston_matrix *m)
}
static void
print_permutation_matrix(const struct weston_inverse_matrix *m)
print_permutation_matrix(const struct inverse_matrix *m)
{
const unsigned *p = m->p;
const unsigned *p = m->perm;
const char *row[4] = {
"1 0 0 0\n",
"0 1 0 0\n",
@@ -95,7 +100,7 @@ print_permutation_matrix(const struct weston_inverse_matrix *m)
}
static void
print_LU_decomposition(const struct weston_inverse_matrix *m)
print_LU_decomposition(const struct inverse_matrix *m)
{
unsigned r, c;
@@ -128,7 +133,7 @@ print_LU_decomposition(const struct weston_inverse_matrix *m)
}
static void
print_inverse_data_matrix(const struct weston_inverse_matrix *m)
print_inverse_data_matrix(const struct inverse_matrix *m)
{
unsigned r, c;
@@ -140,7 +145,7 @@ print_inverse_data_matrix(const struct weston_inverse_matrix *m)
printf("permutation: ");
for (r = 0; r < 4; ++r)
printf(" %u", m->p[r]);
printf(" %u", m->perm[r]);
printf("\n");
}
@@ -175,22 +180,6 @@ randomize_matrix(struct weston_matrix *m)
#endif
}
static void
invert_matrix(struct weston_matrix *m)
{
struct weston_inverse_matrix q;
unsigned i;
if (weston_matrix_invert(&q, m) != 0) {
m->d[0] = NAN;
return;
}
for (i = 0; i < 4; ++i)
weston_matrix_inverse_transform(&q,
(struct weston_vector *)&m->d[i * 4]);
}
/* Take a matrix, compute inverse, multiply together
* and subtract the identity matrix to get the error matrix.
* Return the largest absolute value from the error matrix.
@@ -199,15 +188,14 @@ static double
test_inverse(struct weston_matrix *m)
{
unsigned i;
struct weston_inverse_matrix q;
struct inverse_matrix q;
double errsup = 0.0;
if (weston_matrix_invert(&q, m) != 0)
if (matrix_invert(q.LU, q.perm, m) != 0)
return INFINITY;
for (i = 0; i < 4; ++i)
weston_matrix_inverse_transform(&q,
(struct weston_vector *)&m->d[i * 4]);
inverse_transform(q.LU, q.perm, &m->d[i * 4]);
m->d[0] -= 1.0f;
m->d[5] -= 1.0f;
@@ -309,21 +297,21 @@ static void __attribute__((noinline))
test_loop_speed_inversetransform(void)
{
struct weston_matrix m;
struct weston_inverse_matrix inv;
struct inverse_matrix inv;
struct weston_vector v = { { 0.5, 0.5, 0.5, 1.0 } };
unsigned long count = 0;
double t;
printf("\nRunning 3 s test on weston_matrix_inverse_transform()...\n");
printf("\nRunning 3 s test on inverse_transform()...\n");
weston_matrix_init(&m);
weston_matrix_invert(&inv, &m);
matrix_invert(inv.LU, inv.perm, &m);
running = 1;
alarm(3);
reset_timer();
while (running) {
weston_matrix_inverse_transform(&inv, &v);
inverse_transform(inv.LU, inv.perm, v.f);
count++;
}
t = read_timer();
@@ -336,11 +324,11 @@ static void __attribute__((noinline))
test_loop_speed_invert(void)
{
struct weston_matrix m;
struct weston_inverse_matrix inv;
struct inverse_matrix inv;
unsigned long count = 0;
double t;
printf("\nRunning 3 s test on weston_matrix_invert()...\n");
printf("\nRunning 3 s test on matrix_invert()...\n");
weston_matrix_init(&m);
@@ -348,7 +336,7 @@ test_loop_speed_invert(void)
alarm(3);
reset_timer();
while (running) {
weston_matrix_invert(&inv, &m);
matrix_invert(inv.LU, inv.perm, &m);
count++;
}
t = read_timer();
@@ -364,7 +352,7 @@ test_loop_speed_invert_explicit(void)
unsigned long count = 0;
double t;
printf("\nRunning 3 s test on computing the explicit inverse matrix...\n");
printf("\nRunning 3 s test on weston_matrix_invert()...\n");
weston_matrix_init(&m);
@@ -372,7 +360,7 @@ test_loop_speed_invert_explicit(void)
alarm(3);
reset_timer();
while (running) {
invert_matrix(&m);
weston_matrix_invert(&m, &m);
count++;
}
t = read_timer();
@@ -385,7 +373,7 @@ int main(void)
{
struct sigaction ding;
struct weston_matrix M;
struct weston_inverse_matrix Q;
struct inverse_matrix Q;
int ret;
double errsup;
double det;
@@ -402,7 +390,7 @@ int main(void)
M.d[2] = 6.0; M.d[6] = 18.0; M.d[10] = -12; M.d[14] = 0.0;
M.d[3] = 0.0; M.d[7] = 0.0; M.d[11] = 0.0; M.d[15] = 1.0;
ret = weston_matrix_invert(&Q, &M);
ret = matrix_invert(Q.LU, Q.perm, &M);
printf("ret = %d\n", ret);
printf("det = %g\n\n", determinant(&M));