From 21e8b8ad389dda55d92af4af1fd22aac657074b4 Mon Sep 17 00:00:00 2001 From: sanine Date: Sun, 27 Nov 2022 13:41:14 -0600 Subject: add matrix multiplication --- src/transform.c | 35 +++++++++++++++++++++++++ src/transform.h | 6 +++++ src/transform.test.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 114 insertions(+) (limited to 'src') diff --git a/src/transform.c b/src/transform.c index 465841d..b0f6dc9 100644 --- a/src/transform.c +++ b/src/transform.c @@ -10,6 +10,41 @@ #define TWO_PI 6.2831853071796f +int kai_identity(ka_matrix_t *m) +{ + memset(*m, 0, sizeof(ka_matrix_t)); + (*m)[0] = 1.0f; + (*m)[5] = 1.0f; + (*m)[10] = 1.0f; + (*m)[15] = 1.0f; + + return 0; +} + + +int kai_multiply(ka_matrix_t *dest, ka_matrix_t A, ka_matrix_t B) +{ + ka_matrix_t C; + memset(C, 0, sizeof(ka_matrix_t)); + + int i, j, k; + int a_ind, b_ind, c_ind; + for (i=0; i<4; i++) { + for (j=0; j<4; j++) { + c_ind = (4*i) + j; + for (k=0; k<4; k++) { + a_ind = (4*i) + k; + b_ind = (4*k) + j; + C[c_ind] += A[a_ind] * B[b_ind]; + } + } + } + + memcpy(*dest, C, sizeof(ka_matrix_t)); + return 0; +} + + int kai_parse_matrix(ka_matrix_t *m, ezxml_t tag) { if (strcmp("matrix", ezxml_name(tag)) != 0) diff --git a/src/transform.h b/src/transform.h index f8dc2ad..db582ac 100644 --- a/src/transform.h +++ b/src/transform.h @@ -5,6 +5,12 @@ #include +/* fill a ka_matrix_t with the identity matrix */ +int kai_identity(ka_matrix_t *m); + +/* multiply two matrices together */ +int kai_multiply(ka_matrix_t *dest, ka_matrix_t A, ka_matrix_t B); + /* parse a tag into a ka_matrix_t */ int kai_parse_matrix(ka_matrix_t *m, ezxml_t tag); diff --git a/src/transform.test.c b/src/transform.test.c index ba663bb..4b1e329 100644 --- a/src/transform.test.c +++ b/src/transform.test.c @@ -3,6 +3,8 @@ #include "test/test.h" #include "transform.h" +void create_identity(); +void multiply(); void parse_matrix_fail_nonmatrix(); void parse_identity(); @@ -19,6 +21,8 @@ void parse_translate(); void suite_transform() { + lily_run_test(create_identity); + lily_run_test(multiply); lily_run_test(parse_matrix_fail_nonmatrix); lily_run_test(parse_identity); lily_run_test(parse_rotate_fail); @@ -32,6 +36,75 @@ void suite_transform() /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ +/* ======== basic ======== */ + +void create_identity() +{ + ka_matrix_t mat; + mat[0] = 100; + int rc = kai_identity(&mat); + lily_assert_true(rc == 0); + + lily_assert_float_equal(mat[0], 1.0f, 1e-3); + lily_assert_float_equal(mat[1], 0.0f, 1e-3); + lily_assert_float_equal(mat[2], 0.0f, 1e-3); + lily_assert_float_equal(mat[3], 0.0f, 1e-3); + lily_assert_float_equal(mat[4], 0.0f, 1e-3); + lily_assert_float_equal(mat[5], 1.0f, 1e-3); + lily_assert_float_equal(mat[6], 0.0f, 1e-3); + lily_assert_float_equal(mat[7], 0.0f, 1e-3); + lily_assert_float_equal(mat[8], 0.0f, 1e-3); + lily_assert_float_equal(mat[9], 0.0f, 1e-3); + lily_assert_float_equal(mat[10], 1.0f, 1e-3); + lily_assert_float_equal(mat[11], 0.0f, 1e-3); + lily_assert_float_equal(mat[12], 0.0f, 1e-3); + lily_assert_float_equal(mat[13], 0.0f, 1e-3); + lily_assert_float_equal(mat[14], 0.0f, 1e-3); + lily_assert_float_equal(mat[15], 1.0f, 1e-3); +} + + +void multiply() +{ + ka_matrix_t A = { + 2.0f, 0.0f, 1.0f, 0.0f, + 0.0f, 3.0f, 0.0f, 0.0f, + 0.0f, 0.0f, 1.0f, 0.0f, + 0.0f, 0.0f, 0.0f, 1.0f, + }; + + ka_matrix_t B = { + 0.0f, 3.0f, 0.0f, 0.0f, + 1.0f, 0.0f, 1.0f, 0.0f, + 0.0f, 2.0f, 2.0f, 0.0f, + 0.0f, 0.0f, 0.0f, 1.0f, + }; + + int rc = kai_multiply(&A, A, B); + lily_assert_true(rc == 0); + + lily_assert_float_equal(A[0], 0.0f, 1e-3); + lily_assert_float_equal(A[1], 8.0f, 1e-3); + lily_assert_float_equal(A[2], 2.0f, 1e-3); + lily_assert_float_equal(A[3], 0.0f, 1e-3); + + lily_assert_float_equal(A[4], 3.0f, 1e-3); + lily_assert_float_equal(A[5], 0.0f, 1e-3); + lily_assert_float_equal(A[6], 3.0f, 1e-3); + lily_assert_float_equal(A[7], 0.0f, 1e-3); + + lily_assert_float_equal(A[8], 0.0f, 1e-3); + lily_assert_float_equal(A[9], 2.0f, 1e-3); + lily_assert_float_equal(A[10], 2.0f, 1e-3); + lily_assert_float_equal(A[11], 0.0f, 1e-3); + + lily_assert_float_equal(A[12], 0.0f, 1e-3); + lily_assert_float_equal(A[13], 0.0f, 1e-3); + lily_assert_float_equal(A[14], 0.0f, 1e-3); + lily_assert_float_equal(A[15], 1.0f, 1e-3); +} + + /* ======== matrix ======== */ void parse_matrix_fail_nonmatrix() { -- cgit v1.2.1