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cogl/matrix: Multiply using Graphene

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Georges Basile Stavracas Neto 2019-02-27 16:45:43 -03:00
parent c938b25d6a
commit a055e443aa
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GPG Key ID: 886C17EE170D1385
1 changed files with 17 additions and 96 deletions
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113
cogl/cogl/cogl-matrix.c
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@ -191,21 +191,6 @@ do { \
MAT_DIRTY_FLAGS | \
MAT_DIRTY_INVERSE)
/*
* Test geometry related matrix flags.
*
* @mat a pointer to a CoglMatrix structure.
* @a flags mask.
*
* Returns: non-zero if all geometry related matrix flags are contained within
* the mask, or zero otherwise.
*/
#define TEST_MAT_FLAGS(mat, a) \
((MAT_FLAGS_GEOMETRY & (~(a)) & ((mat)->flags) ) == 0)
/*
* Names of the corresponding CoglMatrixType values.
*/
@ -230,62 +215,6 @@ static float identity[16] = {
0.0, 0.0, 0.0, 1.0
};
#define A(row,col) a[(col<<2)+row]
#define B(row,col) b[(col<<2)+row]
#define R(row,col) result[(col<<2)+row]
/*
* Perform a full 4x4 matrix multiplication.
*
* <note>It's assumed that @result != @b. @product == @a is allowed.</note>
*
* <note>KW: 4*16 = 64 multiplications</note>
*/
static void
matrix_multiply4x4 (float *result, const float *a, const float *b)
{
int i;
for (i = 0; i < 4; i++)
{
const float ai0 = A(i,0), ai1=A(i,1), ai2=A(i,2), ai3=A(i,3);
R(i,0) = ai0 * B(0,0) + ai1 * B(1,0) + ai2 * B(2,0) + ai3 * B(3,0);
R(i,1) = ai0 * B(0,1) + ai1 * B(1,1) + ai2 * B(2,1) + ai3 * B(3,1);
R(i,2) = ai0 * B(0,2) + ai1 * B(1,2) + ai2 * B(2,2) + ai3 * B(3,2);
R(i,3) = ai0 * B(0,3) + ai1 * B(1,3) + ai2 * B(2,3) + ai3 * B(3,3);
}
}
/*
* Multiply two matrices known to occupy only the top three rows, such
* as typical model matrices, and orthogonal matrices.
*
* @a matrix.
* @b matrix.
* @product will receive the product of \p a and \p b.
*/
static void
matrix_multiply3x4 (float *result, const float *a, const float *b)
{
int i;
for (i = 0; i < 3; i++)
{
const float ai0 = A(i,0), ai1 = A(i,1), ai2 = A(i,2), ai3 = A(i,3);
R(i,0) = ai0 * B(0,0) + ai1 * B(1,0) + ai2 * B(2,0);
R(i,1) = ai0 * B(0,1) + ai1 * B(1,1) + ai2 * B(2,1);
R(i,2) = ai0 * B(0,2) + ai1 * B(1,2) + ai2 * B(2,2);
R(i,3) = ai0 * B(0,3) + ai1 * B(1,3) + ai2 * B(2,3) + ai3;
}
R(3,0) = 0;
R(3,1) = 0;
R(3,2) = 0;
R(3,3) = 1;
}
#undef A
#undef B
#undef R
/*
* Multiply a matrix by an array of floats with known properties.
*
@ -303,40 +232,32 @@ matrix_multiply_array_with_flags (CoglMatrix *result,
const float *array,
unsigned int flags)
{
result->flags |= (flags | MAT_DIRTY_TYPE | MAT_DIRTY_INVERSE);
graphene_matrix_t m1, m2, res;
if (TEST_MAT_FLAGS (result, MAT_FLAGS_3D))
matrix_multiply3x4 ((float *)result, (float *)result, array);
else
matrix_multiply4x4 ((float *)result, (float *)result, array);
cogl_matrix_to_graphene_matrix (result, &m1);
graphene_matrix_init_from_float (&m2, array);
graphene_matrix_multiply (&m2, &m1, &res);
graphene_matrix_to_cogl_matrix (&res, result);
}
/* Joins both flags and marks the type and inverse as dirty. Calls
* matrix_multiply3x4() if both matrices are 3D, or matrix_multiply4x4()
* otherwise.
*/
static void
_cogl_matrix_multiply (CoglMatrix *result,
const CoglMatrix *a,
const CoglMatrix *b)
{
result->flags = (a->flags |
b->flags |
MAT_DIRTY_TYPE |
MAT_DIRTY_INVERSE);
if (TEST_MAT_FLAGS(result, MAT_FLAGS_3D))
matrix_multiply3x4 ((float *)result, (float *)a, (float *)b);
else
matrix_multiply4x4 ((float *)result, (float *)a, (float *)b);
}
void
cogl_matrix_multiply (CoglMatrix *result,
const CoglMatrix *a,
const CoglMatrix *b)
{
_cogl_matrix_multiply (result, a, b);
graphene_matrix_t m1, m2, res;
cogl_matrix_to_graphene_matrix (a, &m1);
cogl_matrix_to_graphene_matrix (b, &m2);
/* AxB on a column-major matrix (CoglMatrix) is equal
* to BxA on a row-major matrix (graphene_matrix_t)
*/
graphene_matrix_multiply (&m2, &m1, &res);
graphene_matrix_to_cogl_matrix (&res, result);
_COGL_MATRIX_DEBUG_PRINT (result);
}