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cogl/matrix: Apply orthographic with graphene

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This commit is contained in:
Georges Basile Stavracas Neto 2019-02-27 19:00:24 -03:00
parent 10f1d3118c
commit 7c909d184c
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GPG Key ID: 886C17EE170D1385
1 changed files with 10 additions and 43 deletions
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53
cogl/cogl/cogl-matrix.c
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@ -433,48 +433,6 @@ cogl_matrix_perspective (CoglMatrix *matrix,
_COGL_MATRIX_DEBUG_PRINT (matrix);
}
/*
* Apply an orthographic projection matrix.
*
* Creates the projection matrix and multiplies it with matrix, marking the
* MAT_FLAG_GENERAL_SCALE and MAT_FLAG_TRANSLATION flags.
*/
static void
_cogl_matrix_orthographic (CoglMatrix *matrix,
float x_1,
float y_1,
float x_2,
float y_2,
float nearval,
float farval)
{
float m[16];
#define M(row, col) m[col * 4 + row]
M (0,0) = 2.0f / (x_2 - x_1);
M (0,1) = 0.0f;
M (0,2) = 0.0f;
M (0,3) = -(x_2 + x_1) / (x_2 - x_1);
M (1,0) = 0.0f;
M (1,1) = 2.0f / (y_1 - y_2);
M (1,2) = 0.0f;
M (1,3) = -(y_1 + y_2) / (y_1 - y_2);
M (2,0) = 0.0f;
M (2,1) = 0.0f;
M (2,2) = -2.0f / (farval - nearval);
M (2,3) = -(farval + nearval) / (farval - nearval);
M (3,0) = 0.0f;
M (3,1) = 0.0f;
M (3,2) = 0.0f;
M (3,3) = 1.0f;
#undef M
matrix_multiply_array_with_flags (matrix, m);
}
void
cogl_matrix_orthographic (CoglMatrix *matrix,
float x_1,
@ -484,7 +442,16 @@ cogl_matrix_orthographic (CoglMatrix *matrix,
float near,
float far)
{
_cogl_matrix_orthographic (matrix, x_1, y_1, x_2, y_2, near, far);
graphene_matrix_t ortho, m;
graphene_matrix_init_ortho (&ortho, x_1, x_2, y_2, y_1, near, far);
cogl_matrix_to_graphene_matrix (matrix, &m);
graphene_matrix_transpose (&m, &m);
graphene_matrix_multiply (&m, &ortho, &m);
graphene_matrix_to_cogl_matrix (&m, matrix);
_COGL_MATRIX_DEBUG_PRINT (matrix);
}