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Removes need for casting (const float *) to (GLfloat *) in _cogl_set_clip_planes

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This removes cogl.c:apply_matrix(), and makes cogl.c:project_vertex() use
cogl_matrix_transform_point instead.
This commit is contained in:
Robert Bragg 2009-03-06 02:39:24 +00:00
parent 08932584b5
commit 20a2f76e1f
1 changed files with 12 additions and 31 deletions
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43
clutter/cogl/gl/cogl.c
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@ -326,29 +326,20 @@ cogl_set_source_color (const CoglColor *color)
}
static void
apply_matrix (const float *matrix, float *vertex)
{
int x, y;
float vertex_out[4] = { 0 };
for (y = 0; y < 4; y++)
for (x = 0; x < 4; x++)
vertex_out[y] += vertex[x] * matrix[y + x * 4];
memcpy (vertex, vertex_out, sizeof (vertex_out));
}
static void
project_vertex (float *modelview,
float *project,
project_vertex (const CoglMatrix *modelview_matrix,
const CoglMatrix *projection_matrix,
float *vertex)
{
int i;
/* Apply the modelview matrix */
apply_matrix (modelview, vertex);
cogl_matrix_transform_point (modelview_matrix,
&vertex[0], &vertex[1],
&vertex[2], &vertex[3]);
/* Apply the projection matrix */
apply_matrix (project, vertex);
cogl_matrix_transform_point (projection_matrix,
&vertex[0], &vertex[1],
&vertex[2], &vertex[3]);
/* Convert from homogenized coordinates */
for (i = 0; i < 4; i++)
vertex[i] /= vertex[3];
@ -409,8 +400,6 @@ _cogl_set_clip_planes (float x_offset,
{
CoglMatrix modelview_matrix;
CoglMatrix projection_matrix;
GLfloat *modelview;
GLfloat *projection;
float vertex_tl[4] = { x_offset, y_offset, 0, 1.0 };
float vertex_tr[4] = { x_offset + width, y_offset, 0, 1.0 };
@ -418,23 +407,15 @@ _cogl_set_clip_planes (float x_offset,
float vertex_br[4] = { x_offset + width, y_offset + height,
0, 1.0 };
/* hack alert: there's no way to get *and modify*
* CoglMatrix as a float array. So we just
* use a cast instead of cogl_matrix_get_array(),
* and know that we will not call any more CoglMatrix
* methods after we write to it directly.
*/
_cogl_get_matrix (COGL_MATRIX_PROJECTION,
&projection_matrix);
projection = (GLfloat*) &projection_matrix;
_cogl_get_matrix (COGL_MATRIX_MODELVIEW,
&modelview_matrix);
modelview = (GLfloat*) &modelview_matrix;
project_vertex (modelview, projection, vertex_tl);
project_vertex (modelview, projection, vertex_tr);
project_vertex (modelview, projection, vertex_bl);
project_vertex (modelview, projection, vertex_br);
project_vertex (&modelview_matrix, &projection_matrix, vertex_tl);
project_vertex (&modelview_matrix, &projection_matrix, vertex_tr);
project_vertex (&modelview_matrix, &projection_matrix, vertex_bl);
project_vertex (&modelview_matrix, &projection_matrix, vertex_br);
/* If the order of the top and bottom lines is different from the
order of the left and right lines then the clip rect must have