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[cogl] Removes the cogl-current-matrix abstraction

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The indirection through this API isn't necessary since we no longer
arbitrate between the OpenGL matrix API and Cogl's client side API.  Also it
doesn't help to maintain an OpenGL style matrix mode API for internal use
since it's awkward to keep restoring the MODELVIEW mode and easy enough to
directly work with the matrix stacks of interest.

This replaces use of the _cogl_current_matrix API with direct use of the
_cogl_matrix_stack API.  All the unused cogl_current_matrix API is removed
and the matrix utility code left in cogl-current-matrix.c was moved to
cogl.c.
This commit is contained in:
Robert Bragg
2009-10-13 23:09:42 +01:00
parent 01887460f6
commit eed2479556
15 changed files with 270 additions and 227 deletions
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228
cogl/cogl.c
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@ -334,20 +334,22 @@ set_clip_plane (GLint plane_num,
angle = atan2f (vertex_b[1] - vertex_a[1],
vertex_b[0] - vertex_a[0]) * (180.0/G_PI);
_cogl_current_matrix_push ();
_cogl_matrix_stack_push (ctx->modelview_stack);
/* Load the identity matrix and multiply by the reverse of the
projection matrix so we can specify the plane in screen
coordinates */
_cogl_current_matrix_identity ();
_cogl_matrix_stack_load_identity (ctx->modelview_stack);
cogl_matrix_init_from_array (&inverse_projection,
ctx->inverse_projection);
_cogl_current_matrix_multiply (&inverse_projection);
_cogl_matrix_stack_multiply (ctx->modelview_stack, &inverse_projection);
/* Rotate about point a */
_cogl_current_matrix_translate (vertex_a[0], vertex_a[1], vertex_a[2]);
_cogl_matrix_stack_translate (ctx->modelview_stack,
vertex_a[0], vertex_a[1], vertex_a[2]);
/* Rotate the plane by the calculated angle so that it will connect
the two points */
_cogl_current_matrix_rotate (angle, 0.0f, 0.0f, 1.0f);
_cogl_current_matrix_translate (-vertex_a[0], -vertex_a[1], -vertex_a[2]);
_cogl_matrix_stack_rotate (ctx->modelview_stack, angle, 0.0f, 0.0f, 1.0f);
_cogl_matrix_stack_translate (ctx->modelview_stack,
-vertex_a[0], -vertex_a[1], -vertex_a[2]);
_cogl_flush_matrix_stacks ();
@ -361,7 +363,7 @@ set_clip_plane (GLint plane_num,
GE( glClipPlane (plane_num, plane) );
#endif
_cogl_current_matrix_pop ();
_cogl_matrix_stack_pop (ctx->modelview_stack);
}
void
@ -373,16 +375,16 @@ _cogl_set_clip_planes (float x_offset,
CoglMatrix modelview_matrix;
CoglMatrix projection_matrix;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
float vertex_tl[4] = { x_offset, y_offset, 0, 1.0 };
float vertex_tr[4] = { x_offset + width, y_offset, 0, 1.0 };
float vertex_bl[4] = { x_offset, y_offset + height, 0, 1.0 };
float vertex_br[4] = { x_offset + width, y_offset + height,
0, 1.0 };
_cogl_get_matrix (COGL_MATRIX_PROJECTION,
&projection_matrix);
_cogl_get_matrix (COGL_MATRIX_MODELVIEW,
&modelview_matrix);
_cogl_matrix_stack_get (ctx->projection_stack, &projection_matrix);
_cogl_matrix_stack_get (ctx->modelview_stack, &modelview_matrix);
project_vertex (&modelview_matrix, &projection_matrix, vertex_tl);
project_vertex (&modelview_matrix, &projection_matrix, vertex_tr);
@ -423,6 +425,8 @@ _cogl_add_stencil_clip (float x_offset,
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* We don't log changes to the stencil buffer so need to flush any
* batched geometry before we start... */
_cogl_journal_flush ();
/* temporarily swap in our special stenciling material */
@ -453,31 +457,25 @@ _cogl_add_stencil_clip (float x_offset,
cogl_rectangle (x_offset, y_offset,
x_offset + width, y_offset + height);
/* make sure our rectangle hits the stencil buffer before we
* change the stencil operation */
_cogl_journal_flush ();
/* Subtract one from all pixels in the stencil buffer so that
only pixels where both the original stencil buffer and the
rectangle are set will be valid */
GE( glStencilOp (GL_DECR, GL_DECR, GL_DECR) );
_cogl_set_current_matrix (COGL_MATRIX_PROJECTION);
_cogl_current_matrix_push ();
_cogl_current_matrix_identity ();
_cogl_matrix_stack_push (ctx->projection_stack);
_cogl_matrix_stack_load_identity (ctx->projection_stack);
/* Cogl generally assumes the modelview matrix is current, so since
* cogl_rectangle will be flushing GL state and emitting geometry
* to OpenGL it will be confused if we leave the projection matrix
* active... */
_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
_cogl_current_matrix_push ();
_cogl_current_matrix_identity ();
_cogl_matrix_stack_push (ctx->modelview_stack);
_cogl_matrix_stack_load_identity (ctx->modelview_stack);
cogl_rectangle (-1.0, -1.0, 1.0, 1.0);
_cogl_current_matrix_pop ();
_cogl_set_current_matrix (COGL_MATRIX_PROJECTION);
_cogl_current_matrix_pop ();
_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
_cogl_matrix_stack_pop (ctx->modelview_stack);
_cogl_matrix_stack_pop (ctx->projection_stack);
}
/* make sure our rectangles hit the stencil buffer before we restore
@ -543,10 +541,12 @@ _cogl_setup_viewport (guint width,
float z_camera;
CoglMatrix projection_matrix;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
cogl_viewport (width, height);
/* For Ortho projection.
* _cogl_current_matrix_ortho (0, width, 0, height, -1, 1);
* _cogl_matrix_stack_ortho (projection_stack, 0, width, 0, height, -1, 1);
*/
cogl_perspective (fovy, aspect, z_near, z_far);
@ -593,11 +593,12 @@ _cogl_setup_viewport (guint width,
cogl_get_projection_matrix (&projection_matrix);
z_camera = 0.5 * projection_matrix.xx;
_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
_cogl_current_matrix_identity ();
_cogl_current_matrix_translate (-0.5f, -0.5f, -z_camera);
_cogl_current_matrix_scale (1.0f / width, -1.0f / height, 1.0f / width);
_cogl_current_matrix_translate (0.0f, -1.0 * height, 0.0f);
_cogl_matrix_stack_load_identity (ctx->modelview_stack);
_cogl_matrix_stack_translate (ctx->modelview_stack, -0.5f, -0.5f, -z_camera);
_cogl_matrix_stack_scale (ctx->modelview_stack,
1.0f / width, -1.0f / height, 1.0f / width);
_cogl_matrix_stack_translate (ctx->modelview_stack,
0.0f, -1.0 * height, 0.0f);
}
CoglFeatureFlags
@ -936,3 +937,164 @@ _cogl_destroy_texture_units (void)
g_list_free (ctx->texture_units);
}
void
cogl_push_matrix (void)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_matrix_stack_push (ctx->modelview_stack);
}
void
cogl_pop_matrix (void)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_matrix_stack_pop (ctx->modelview_stack);
}
void
cogl_scale (float x, float y, float z)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_matrix_stack_scale (ctx->modelview_stack, x, y, z);
}
void
cogl_translate (float x, float y, float z)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_matrix_stack_translate (ctx->modelview_stack, x, y, z);
}
void
cogl_rotate (float angle, float x, float y, float z)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_matrix_stack_rotate (ctx->modelview_stack, angle, x, y, z);
}
void
cogl_perspective (float fov_y,
float aspect,
float z_near,
float z_far)
{
float ymax = z_near * tanf (fov_y * G_PI / 360.0);
cogl_frustum (-ymax * aspect, /* left */
ymax * aspect, /* right */
-ymax, /* bottom */
ymax, /* top */
z_near,
z_far);
}
void
cogl_frustum (float left,
float right,
float bottom,
float top,
float z_near,
float z_far)
{
float c, d;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_matrix_stack_load_identity (ctx->projection_stack);
_cogl_matrix_stack_frustum (ctx->projection_stack,
left,
right,
bottom,
top,
z_near,
z_far);
/* Calculate and store the inverse of the matrix */
memset (ctx->inverse_projection, 0, sizeof (float) * 16);
c = - (z_far + z_near) / (z_far - z_near);
d = - (2 * (z_far * z_near)) / (z_far - z_near);
#define M(row,col) ctx->inverse_projection[col*4+row]
M(0,0) = (right - left) / (2 * z_near);
M(0,3) = (right + left) / (2 * z_near);
M(1,1) = (top - bottom) / (2 * z_near);
M(1,3) = (top + bottom) / (2 * z_near);
M(2,3) = -1.0;
M(3,2) = 1.0 / d;
M(3,3) = c / d;
#undef M
}
void
cogl_ortho (float left,
float right,
float bottom,
float top,
float z_near,
float z_far)
{
CoglMatrix ortho;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
cogl_matrix_init_identity (&ortho);
cogl_matrix_ortho (&ortho, left, right, bottom, top, z_near, z_far);
_cogl_matrix_stack_set (ctx->projection_stack, &ortho);
/* Calculate and store the inverse of the matrix */
memset (ctx->inverse_projection, 0, sizeof (float) * 16);
#define M(row,col) ctx->inverse_projection[col*4+row]
M(0,0) = 1.0 / ortho.xx;
M(0,3) = -ortho.xw;
M(1,1) = 1.0 / ortho.yy;
M(1,3) = -ortho.yw;
M(2,2) = 1.0 / ortho.zz;
M(2,3) = -ortho.zw;
M(3,3) = 1.0;
#undef M
}
void
cogl_get_modelview_matrix (CoglMatrix *matrix)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_matrix_stack_get (ctx->modelview_stack, matrix);
}
void
cogl_set_modelview_matrix (CoglMatrix *matrix)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_matrix_stack_set (ctx->modelview_stack, matrix);
}
void
cogl_get_projection_matrix (CoglMatrix *matrix)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_matrix_stack_get (ctx->projection_stack, matrix);
}
void
cogl_set_projection_matrix (CoglMatrix *matrix)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_matrix_stack_set (ctx->projection_stack, matrix);
/* FIXME: Update the inverse projection matrix!! Presumably use
* of clip planes must currently be broken if this API is used. */
}
void
_cogl_flush_matrix_stacks (void)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_matrix_stack_flush_to_gl (ctx->projection_stack,
COGL_MATRIX_PROJECTION);
_cogl_matrix_stack_flush_to_gl (ctx->modelview_stack,
COGL_MATRIX_MODELVIEW);
}