void
_mai_node_draw_recursive (MaiNode *self, CoglMatrix *acc_mtx)
{
CoglPrimitive *to_draw;
to_draw = nx_cogl_primitive_new (self->mesh_verts, self->mesh_indices, self->mesh_uvs);
CoglMatrix cur_mtx;
cogl_matrix_init_identity (&cur_mtx);
cogl_matrix_multiply (&cur_mtx, &cur_mtx, acc_mtx);
cogl_matrix_multiply (&cur_mtx, &cur_mtx, self->transformation);
cogl_set_modelview_matrix (&cur_mtx);
nx_cogl_primitive_draw (to_draw);
cogl_object_unref (to_draw);
int tmp1;
for (tmp1=0; tmp1<self->children->len; ++tmp1)
{
MaiNode *child;
child = g_mai_node_ptr_array_index (self->children, tmp1);
_mai_node_draw_recursive (child, &cur_mtx);
}
}
void
rig_camera_update_view (RigEngine *engine, RutEntity *camera, CoglBool shadow_pass)
{
RutCamera *camera_component =
rut_entity_get_component (camera, RUT_COMPONENT_TYPE_CAMERA);
CoglMatrix transform;
CoglMatrix inverse_transform;
CoglMatrix view;
/* translate to z_2d and scale */
if (!shadow_pass)
view = engine->main_view;
else
view = engine->identity;
/* apply the camera viewing transform */
rut_graphable_get_transform (camera, &transform);
cogl_matrix_get_inverse (&transform, &inverse_transform);
cogl_matrix_multiply (&view, &view, &inverse_transform);
if (shadow_pass)
{
CoglMatrix flipped_view;
cogl_matrix_init_identity (&flipped_view);
cogl_matrix_scale (&flipped_view, 1, -1, 1);
cogl_matrix_multiply (&flipped_view, &flipped_view, &view);
rut_camera_set_view_transform (camera_component, &flipped_view);
}
else
rut_camera_set_view_transform (camera_component, &view);
}
static void
get_light_modelviewprojection (const CoglMatrix *model_transform,
RutEntity *light,
const CoglMatrix *light_projection,
CoglMatrix *light_mvp)
{
const CoglMatrix *light_transform;
CoglMatrix light_view;
/* TODO: cache the bias * light_projection * light_view matrix! */
/* Move the unit engine from [-1,1] to [0,1], column major order */
float bias[16] = {
.5f, .0f, .0f, .0f,
.0f, .5f, .0f, .0f,
.0f, .0f, .5f, .0f,
.5f, .5f, .5f, 1.f
};
light_transform = rut_entity_get_transform (light);
cogl_matrix_get_inverse (light_transform, &light_view);
cogl_matrix_init_from_array (light_mvp, bias);
cogl_matrix_multiply (light_mvp, light_mvp, light_projection);
cogl_matrix_multiply (light_mvp, light_mvp, &light_view);
cogl_matrix_multiply (light_mvp, light_mvp, model_transform);
}
void
_cogl_matrix_stack_prepare_for_flush (CoglMatrixStack *stack,
CoglMatrixMode mode,
CoglMatrixStackFlushFunc callback,
void *user_data)
{
CoglMatrixState *state;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
state = _cogl_matrix_stack_top (stack);
/* Because Cogl defines texture coordinates to have a top left origin and
* because offscreen framebuffers may be used for rendering to textures we
* always render upside down to offscreen buffers.
*/
if (mode == COGL_MATRIX_PROJECTION &&
cogl_is_offscreen (_cogl_get_draw_buffer ()))
{
CoglMatrix flipped_projection;
CoglMatrix *projection =
state->is_identity ? &ctx->identity_matrix : &state->matrix;
cogl_matrix_multiply (&flipped_projection,
&ctx->y_flip_matrix, projection);
callback (FALSE, &flipped_projection, user_data);
}
else
callback (state->is_identity,
state->is_identity ? &ctx->identity_matrix : &state->matrix,
user_data);
}
static void
frame_cb (ClutterTimeline *timeline,
gint frame_no,
gpointer data)
{
TestMultiLayerMaterialState *state = data;
cogl_matrix_multiply (&state->tex_matrix0,
&state->tex_matrix0,
&state->rot_matrix0);
cogl_material_set_layer_matrix (state->material0, 2, &state->tex_matrix0);
cogl_matrix_multiply (&state->tex_matrix1,
&state->tex_matrix1,
&state->rot_matrix1);
cogl_material_set_layer_matrix (state->material1, 2, &state->tex_matrix1);
}
void
rut_transform_quaternion_rotate (RutTransform *transform,
const CoglQuaternion *quaternion)
{
CoglMatrix rotation;
cogl_matrix_init_from_quaternion (&rotation, quaternion);
cogl_matrix_multiply (&transform->matrix, &transform->matrix, &rotation);
}
static void
set_clip_planes (CoglFramebuffer *framebuffer,
CoglMatrixEntry *modelview_entry,
float x_1,
float y_1,
float x_2,
float y_2)
{
CoglMatrix modelview_matrix;
CoglMatrixStack *projection_stack =
_cogl_framebuffer_get_projection_stack (framebuffer);
CoglMatrix projection_matrix;
CoglMatrix modelview_projection;
float signed_area;
float vertex_tl[4] = { x_1, y_1, 0, 1.0 };
float vertex_tr[4] = { x_2, y_1, 0, 1.0 };
float vertex_bl[4] = { x_1, y_2, 0, 1.0 };
float vertex_br[4] = { x_2, y_2, 0, 1.0 };
cogl_matrix_stack_get (projection_stack, &projection_matrix);
cogl_matrix_entry_get (modelview_entry, &modelview_matrix);
cogl_matrix_multiply (&modelview_projection,
&projection_matrix,
&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);
/* Calculate the signed area of the polygon formed by the four
vertices so that we can know its orientation */
signed_area = (vertex_tl[0] * (vertex_tr[1] - vertex_bl[1])
+ vertex_tr[0] * (vertex_br[1] - vertex_tl[1])
+ vertex_br[0] * (vertex_bl[1] - vertex_tr[1])
+ vertex_bl[0] * (vertex_tl[1] - vertex_br[1]));
/* Set the clip planes to form lines between all of the vertices
using the same orientation as we calculated */
if (signed_area > 0.0f)
{
/* counter-clockwise */
set_clip_plane (framebuffer, GL_CLIP_PLANE0, vertex_tl, vertex_bl);
set_clip_plane (framebuffer, GL_CLIP_PLANE1, vertex_bl, vertex_br);
set_clip_plane (framebuffer, GL_CLIP_PLANE2, vertex_br, vertex_tr);
set_clip_plane (framebuffer, GL_CLIP_PLANE3, vertex_tr, vertex_tl);
}
else
{
/* clockwise */
set_clip_plane (framebuffer, GL_CLIP_PLANE0, vertex_tl, vertex_tr);
set_clip_plane (framebuffer, GL_CLIP_PLANE1, vertex_tr, vertex_br);
set_clip_plane (framebuffer, GL_CLIP_PLANE2, vertex_br, vertex_bl);
set_clip_plane (framebuffer, GL_CLIP_PLANE3, vertex_bl, vertex_tl);
}
}
void
_clutter_util_fully_transform_vertices (const CoglMatrix *modelview,
const CoglMatrix *projection,
const float *viewport,
const ClutterVertex *vertices_in,
ClutterVertex *vertices_out,
int n_vertices)
{
CoglMatrix modelview_projection;
ClutterVertex4 *vertices_tmp;
int i;
vertices_tmp = g_alloca (sizeof (ClutterVertex4) * n_vertices);
if (n_vertices >= 4)
{
/* XXX: we should find a way to cache this per actor */
cogl_matrix_multiply (&modelview_projection,
projection,
modelview);
cogl_matrix_project_points (&modelview_projection,
3,
sizeof (ClutterVertex),
vertices_in,
sizeof (ClutterVertex4),
vertices_tmp,
n_vertices);
}
else
{
cogl_matrix_transform_points (modelview,
3,
sizeof (ClutterVertex),
vertices_in,
sizeof (ClutterVertex4),
vertices_tmp,
n_vertices);
cogl_matrix_project_points (projection,
3,
sizeof (ClutterVertex4),
vertices_tmp,
sizeof (ClutterVertex4),
vertices_tmp,
n_vertices);
}
for (i = 0; i < n_vertices; i++)
{
ClutterVertex4 vertex_tmp = vertices_tmp[i];
ClutterVertex *vertex_out = &vertices_out[i];
/* Finally translate from OpenGL coords to window coords */
vertex_out->x = MTX_GL_SCALE_X (vertex_tmp.x, vertex_tmp.w,
viewport[2], viewport[0]);
vertex_out->y = MTX_GL_SCALE_Y (vertex_tmp.y, vertex_tmp.w,
viewport[3], viewport[1]);
}
}
void
_cogl_matrix_stack_multiply (CoglMatrixStack *stack,
const CoglMatrix *matrix)
{
CoglMatrixState *state;
state = _cogl_matrix_stack_top_mutable (stack, TRUE);
cogl_matrix_multiply (&state->matrix, &state->matrix, matrix);
state->is_identity = FALSE;
stack->age++;
}
static void
get_modelview_matrix (RutEntity *camera,
RutEntity *entity,
CoglMatrix *modelview)
{
RutCamera *camera_component =
rut_entity_get_component (camera, RUT_COMPONENT_TYPE_CAMERA);
*modelview = *rut_camera_get_view_transform (camera_component);
cogl_matrix_multiply (modelview,
modelview,
rut_entity_get_transform (entity));
}
/* Check if we're painting the MetaWindowGroup "untransformed". This can
* differ from the result of actor_is_untransformed(window_group) if we're
* inside a clone paint. The integer translation, if any, is returned.
*/
static gboolean
painting_untransformed (MetaWindowGroup *window_group,
int *x_origin,
int *y_origin)
{
CoglMatrix modelview, projection, modelview_projection;
ClutterVertex vertices[4];
int width, height;
float viewport[4];
int i;
cogl_get_modelview_matrix (&modelview);
cogl_get_projection_matrix (&projection);
cogl_matrix_multiply (&modelview_projection,
&projection,
&modelview);
meta_screen_get_size (window_group->screen, &width, &height);
vertices[0].x = 0;
vertices[0].y = 0;
vertices[0].z = 0;
vertices[1].x = width;
vertices[1].y = 0;
vertices[1].z = 0;
vertices[2].x = 0;
vertices[2].y = height;
vertices[2].z = 0;
vertices[3].x = width;
vertices[3].y = height;
vertices[3].z = 0;
cogl_get_viewport (viewport);
for (i = 0; i < 4; i++)
{
float w = 1;
cogl_matrix_transform_point (&modelview_projection, &vertices[i].x, &vertices[i].y, &vertices[i].z, &w);
vertices[i].x = MTX_GL_SCALE_X (vertices[i].x, w,
viewport[2], viewport[0]);
vertices[i].y = MTX_GL_SCALE_Y (vertices[i].y, w,
viewport[3], viewport[1]);
}
return meta_actor_vertices_are_untransformed (vertices, width, height, x_origin, y_origin);
}
void
cogl_matrix_frustum (CoglMatrix *matrix,
float left,
float right,
float bottom,
float top,
float z_near,
float z_far)
{
#ifndef USE_MESA_MATRIX_API
float x, y, a, b, c, d;
CoglMatrix frustum;
x = (2.0f * z_near) / (right - left);
y = (2.0f * z_near) / (top - bottom);
a = (right + left) / (right - left);
b = (top + bottom) / (top - bottom);
c = -(z_far + z_near) / ( z_far - z_near);
d = -(2.0f * z_far* z_near) / (z_far - z_near);
frustum.xx = x;
frustum.yx = 0.0f;
frustum.zx = 0.0f;
frustum.wx = 0.0f;
frustum.xy = 0.0f;
frustum.yy = y;
frustum.zy = 0.0f;
frustum.wy = 0.0f;
frustum.xz = a;
frustum.yz = b;
frustum.zz = c;
frustum.wz = -1.0f;
frustum.xw = 0.0f;
frustum.yw = 0.0f;
frustum.zw = d;
frustum.ww = 0.0f;
cogl_matrix_multiply (matrix, matrix, &frustum);
#else
_math_matrix_frustum (matrix, left, right, bottom, top, z_near, z_far);
#endif
_COGL_MATRIX_DEBUG_PRINT (matrix);
}
void
cogl_matrix_rotate (CoglMatrix *matrix,
float angle,
float x,
float y,
float z)
{
#ifndef USE_MESA_MATRIX_API
CoglMatrix rotation;
CoglMatrix result;
float c, s;
angle *= G_PI / 180.0f;
c = cosf (angle);
s = sinf (angle);
rotation.xx = x * x * (1.0f - c) + c;
rotation.yx = y * x * (1.0f - c) + z * s;
rotation.zx = x * z * (1.0f - c) - y * s;
rotation.wx = 0.0f;
rotation.xy = x * y * (1.0f - c) - z * s;
rotation.yy = y * y * (1.0f - c) + c;
rotation.zy = y * z * (1.0f - c) + x * s;
rotation.wy = 0.0f;
rotation.xz = x * z * (1.0f - c) + y * s;
rotation.yz = y * z * (1.0f - c) - x * s;
rotation.zz = z * z * (1.0f - c) + c;
rotation.wz = 0.0f;
rotation.xw = 0.0f;
rotation.yw = 0.0f;
rotation.zw = 0.0f;
rotation.ww = 1.0f;
cogl_matrix_multiply (&result, matrix, &rotation);
*matrix = result;
#else
_math_matrix_rotate (matrix, angle, x, y, z);
#endif
_COGL_MATRIX_DEBUG_PRINT (matrix);
}
void
cogl_matrix_ortho (CoglMatrix *matrix,
float left,
float right,
float bottom,
float top,
float near_val,
float far_val)
{
#ifndef USE_MESA_MATRIX_API
CoglMatrix ortho;
/* column 0 */
ortho.xx = 2.0 / (right - left);
ortho.yx = 0.0;
ortho.zx = 0.0;
ortho.wx = 0.0;
/* column 1 */
ortho.xy = 0.0;
ortho.yy = 2.0 / (top - bottom);
ortho.zy = 0.0;
ortho.wy = 0.0;
/* column 2 */
ortho.xz = 0.0;
ortho.yz = 0.0;
ortho.zz = -2.0 / (far_val - near_val);
ortho.wz = 0.0;
/* column 3 */
ortho.xw = -(right + left) / (right - left);
ortho.yw = -(top + bottom) / (top - bottom);
ortho.zw = -(far_val + near_val) / (far_val - near_val);
ortho.ww = 1.0;
cogl_matrix_multiply (matrix, matrix, &ortho);
#else
_math_matrix_ortho (matrix, left, right, bottom, top, near_val, far_val);
#endif
_COGL_MATRIX_DEBUG_PRINT (matrix);
}
void
cogl_matrix_frustum (CoglMatrix *matrix,
float left,
float right,
float bottom,
float top,
float z_near,
float z_far)
{
float x, y, a, b, c, d;
CoglMatrix frustum;
x = (2.0f * z_near) / (right - left);
y = (2.0f * z_near) / (top - bottom);
a = (right + left) / (right - left);
b = (top + bottom) / (top - bottom);
c = -(z_far + z_near) / ( z_far - z_near);
d = -(2.0f * z_far* z_near) / (z_far - z_near);
frustum.xx = x;
frustum.yx = 0.0f;
frustum.zx = 0.0f;
frustum.wx = 0.0f;
frustum.xy = 0.0f;
frustum.yy = y;
frustum.zy = 0.0f;
frustum.wy = 0.0f;
frustum.xz = a;
frustum.yz = b;
frustum.zz = c;
frustum.wz = -1.0f;
frustum.xw = 0.0f;
frustum.yw = 0.0f;
frustum.zw = d;
frustum.ww = 0.0f;
cogl_matrix_multiply (matrix, matrix, &frustum);
}
/**
* mash_light_get_modelview_matrix:
* @light: A #MashLight
* @matrix: The return location for the matrix
*
* Gets the modelview matrix for the light including all of the
* transformations for its parent actors. This should be used for
* updating uniforms that depend on the actor's transformation or
* position.
*/
void
mash_light_get_modelview_matrix (MashLight *light,
CoglMatrix *matrix)
{
MashLightPrivate *priv = light->priv;
if (priv->modelview_matrix_dirty)
{
ClutterActor *actor;
GSList *parents = NULL, *l;
cogl_matrix_init_identity (&priv->modelview_matrix);
/* Get the complete modelview matrix for light by applying all of
its parent transformations as well as its own in reverse */
for (actor = CLUTTER_ACTOR (light);
actor;
actor = clutter_actor_get_parent (actor))
parents = g_slist_prepend (parents, actor);
for (l = parents; l; l = l->next)
{
CoglMatrix actor_matrix;
cogl_matrix_init_identity (&actor_matrix);
clutter_actor_get_transformation_matrix (CLUTTER_ACTOR (l->data),
&actor_matrix);
cogl_matrix_multiply (&priv->modelview_matrix,
&priv->modelview_matrix,
&actor_matrix);
}
g_slist_free (parents);
priv->modelview_matrix_dirty = FALSE;
}
*matrix = priv->modelview_matrix;
}
void
rut_graphable_apply_transform (RutObject *graphable,
CoglMatrix *transform_matrix)
{
int depth = 0;
RutObject **transform_nodes;
RutObject *node = graphable;
int i;
do {
RutGraphableProps *graphable_priv =
rut_object_get_properties (node, RUT_INTERFACE_ID_GRAPHABLE);
depth++;
node = graphable_priv->parent;
} while (node);
transform_nodes = g_alloca (sizeof (RutObject *) * depth);
node = graphable;
i = 0;
do {
RutGraphableProps *graphable_priv;
if (rut_object_is (node, RUT_INTERFACE_ID_TRANSFORMABLE))
transform_nodes[i++] = node;
graphable_priv =
rut_object_get_properties (node, RUT_INTERFACE_ID_GRAPHABLE);
node = graphable_priv->parent;
} while (node);
for (i--; i >= 0; i--)
{
const CoglMatrix *matrix = rut_transformable_get_matrix (transform_nodes[i]);
cogl_matrix_multiply (transform_matrix, transform_matrix, matrix);
}
}
void
cogl_matrix_rotate (CoglMatrix *matrix,
float angle,
float x,
float y,
float z)
{
CoglMatrix rotation;
CoglMatrix result;
float c, s;
angle *= G_PI / 180.0f;
c = cosf (angle);
s = sinf (angle);
rotation.xx = x * x * (1.0f - c) + c;
rotation.yx = y * x * (1.0f - c) + z * s;
rotation.zx = x * z * (1.0f - c) - y * s;
rotation.wx = 0.0f;
rotation.xy = x * y * (1.0f - c) - z * s;
rotation.yy = y * y * (1.0f - c) + c;
rotation.zy = y * z * (1.0f - c) + x * s;
rotation.wy = 0.0f;
rotation.xz = x * z * (1.0f - c) + y * s;
rotation.yz = y * z * (1.0f - c) - x * s;
rotation.zz = z * z * (1.0f - c) + c;
rotation.wz = 0.0f;
rotation.xw = 0.0f;
rotation.yw = 0.0f;
rotation.zw = 0.0f;
rotation.ww = 1.0f;
cogl_matrix_multiply (&result, matrix, &rotation);
*matrix = result;
}
void
cogl_matrix_ortho (CoglMatrix *matrix,
float left,
float right,
float bottom,
float top,
float near_val,
float far_val)
{
CoglMatrix ortho;
/* column 0 */
ortho.xx = 2.0 / (right - left);
ortho.yx = 0.0;
ortho.zx = 0.0;
ortho.wx = 0.0;
/* column 1 */
ortho.xy = 0.0;
ortho.yy = 2.0 / (top - bottom);
ortho.zy = 0.0;
ortho.wy = 0.0;
/* column 2 */
ortho.xz = 0.0;
ortho.yz = 0.0;
ortho.zz = -2.0 / (far_val - near_val);
ortho.wz = 0.0;
/* column 3 */
ortho.xw = -(right + left) / (right - left);
ortho.yw = -(top + bottom) / (top - bottom);
ortho.zw = -(far_val + near_val) / (far_val - near_val);
ortho.ww = 1.0;
cogl_matrix_multiply (matrix, matrix, &ortho);
}
void
_clutter_util_fully_transform_vertices (const CoglMatrix *modelview,
const CoglMatrix *projection,
const int *viewport,
const ClutterVertex *vertices_in,
ClutterVertex *vertices_out,
int n_vertices)
{
CoglMatrix modelview_projection;
int i;
/* XXX: we should find a way to cache this per actor */
cogl_matrix_multiply (&modelview_projection,
projection,
modelview);
for (i = 0; i < n_vertices; i++)
{
const ClutterVertex *vertex_in = &vertices_in[i];
ClutterVertex *vertex_out = &vertices_out[i];
gfloat x, y, z, w;
x = vertex_in->x;
y = vertex_in->y;
z = vertex_in->z;
w = 1.0;
/* Transform the point using the modelview matrix */
cogl_matrix_transform_point (&modelview_projection, &x, &y, &z, &w);
/* Finally translate from OpenGL coords to window coords */
vertex_out->x = MTX_GL_SCALE_X (x, w, viewport[2], viewport[0]);
vertex_out->y = MTX_GL_SCALE_Y (y, w, viewport[3], viewport[1]);
vertex_out->z = MTX_GL_SCALE_Z (z, w, viewport[2], viewport[0]);
}
}
/* In addition to writing the stack matrix into the give @matrix
* argument this function *may* sometimes also return a pointer
* to a matrix too so if we are querying the inverse matrix we
* should query from the return matrix so that the result can
* be cached within the stack. */
CoglMatrix *
cogl_matrix_entry_get (CoglMatrixEntry *entry,
CoglMatrix *matrix)
{
int depth;
CoglMatrixEntry *current;
CoglMatrixEntry **children;
int i;
for (depth = 0, current = entry;
current;
current = current->parent, depth++)
{
switch (current->op)
{
case COGL_MATRIX_OP_LOAD_IDENTITY:
cogl_matrix_init_identity (matrix);
goto initialized;
case COGL_MATRIX_OP_LOAD:
{
CoglMatrixEntryLoad *load = (CoglMatrixEntryLoad *)current;
*matrix = *load->matrix;
goto initialized;
}
case COGL_MATRIX_OP_SAVE:
{
CoglMatrixEntrySave *save = (CoglMatrixEntrySave *)current;
if (!save->cache_valid)
{
CoglMagazine *matrices_magazine =
cogl_matrix_stack_matrices_magazine;
save->cache = _cogl_magazine_chunk_alloc (matrices_magazine);
cogl_matrix_entry_get (current->parent, save->cache);
save->cache_valid = TRUE;
}
*matrix = *save->cache;
goto initialized;
}
default:
continue;
}
}
initialized:
if (depth == 0)
{
switch (entry->op)
{
case COGL_MATRIX_OP_LOAD_IDENTITY:
case COGL_MATRIX_OP_TRANSLATE:
case COGL_MATRIX_OP_ROTATE:
case COGL_MATRIX_OP_ROTATE_QUATERNION:
case COGL_MATRIX_OP_ROTATE_EULER:
case COGL_MATRIX_OP_SCALE:
case COGL_MATRIX_OP_MULTIPLY:
return NULL;
case COGL_MATRIX_OP_LOAD:
{
CoglMatrixEntryLoad *load = (CoglMatrixEntryLoad *)entry;
return load->matrix;
}
case COGL_MATRIX_OP_SAVE:
{
CoglMatrixEntrySave *save = (CoglMatrixEntrySave *)entry;
return save->cache;
}
}
g_warn_if_reached ();
return NULL;
}
#ifdef COGL_ENABLE_DEBUG
if (!current)
{
g_warning ("Inconsistent matrix stack");
return NULL;
}
entry->composite_gets++;
#endif
children = g_alloca (sizeof (CoglMatrixEntry) * depth);
/* We need walk the list of entries from the init/load/save entry
* back towards the leaf node but the nodes don't link to their
* children so we need to re-walk them here to add to a separate
* array. */
for (i = depth - 1, current = entry;
i >= 0 && current;
i--, current = current->parent)
{
children[i] = current;
}
#ifdef COGL_ENABLE_DEBUG
if (COGL_DEBUG_ENABLED (COGL_DEBUG_PERFORMANCE) &&
entry->composite_gets >= 2)
{
COGL_NOTE (PERFORMANCE,
"Re-composing a matrix stack entry multiple times");
}
#endif
for (i = 0; i < depth; i++)
{
switch (children[i]->op)
{
case COGL_MATRIX_OP_TRANSLATE:
{
CoglMatrixEntryTranslate *translate =
(CoglMatrixEntryTranslate *)children[i];
cogl_matrix_translate (matrix,
translate->x,
translate->y,
translate->z);
continue;
}
case COGL_MATRIX_OP_ROTATE:
{
CoglMatrixEntryRotate *rotate=
(CoglMatrixEntryRotate *)children[i];
cogl_matrix_rotate (matrix,
rotate->angle,
rotate->x,
rotate->y,
rotate->z);
continue;
}
case COGL_MATRIX_OP_ROTATE_EULER:
{
CoglMatrixEntryRotateEuler *rotate =
(CoglMatrixEntryRotateEuler *)children[i];
CoglEuler euler;
cogl_euler_init (&euler,
rotate->heading,
rotate->pitch,
rotate->roll);
cogl_matrix_rotate_euler (matrix,
&euler);
continue;
}
case COGL_MATRIX_OP_ROTATE_QUATERNION:
{
CoglMatrixEntryRotateQuaternion *rotate =
(CoglMatrixEntryRotateQuaternion *)children[i];
CoglQuaternion quaternion;
cogl_quaternion_init_from_array (&quaternion, rotate->values);
cogl_matrix_rotate_quaternion (matrix, &quaternion);
continue;
}
case COGL_MATRIX_OP_SCALE:
{
CoglMatrixEntryScale *scale =
(CoglMatrixEntryScale *)children[i];
cogl_matrix_scale (matrix,
scale->x,
scale->y,
scale->z);
continue;
}
case COGL_MATRIX_OP_MULTIPLY:
{
CoglMatrixEntryMultiply *multiply =
(CoglMatrixEntryMultiply *)children[i];
cogl_matrix_multiply (matrix, matrix, multiply->matrix);
continue;
}
case COGL_MATRIX_OP_LOAD_IDENTITY:
case COGL_MATRIX_OP_LOAD:
case COGL_MATRIX_OP_SAVE:
g_warn_if_reached ();
continue;
}
}
return NULL;
}
void
_cogl_matrix_stack_flush_to_gl_builtins (CoglContext *ctx,
CoglMatrixStack *stack,
CoglMatrixMode mode,
gboolean disable_flip)
{
g_assert (ctx->driver == COGL_DRIVER_GL ||
ctx->driver == COGL_DRIVER_GLES1);
#if defined (HAVE_COGL_GL) || defined (HAVE_COGL_GLES)
{
gboolean needs_flip;
CoglMatrixState *state;
CoglMatrixStackCache *cache;
state = _cogl_matrix_stack_top (stack);
if (mode == COGL_MATRIX_PROJECTION)
{
/* Because Cogl defines texture coordinates to have a top left
* origin and because offscreen framebuffers may be used for
* rendering to textures we always render upside down to
* offscreen buffers. Also for some backends we need to render
* onscreen buffers upside-down too.
*/
if (disable_flip)
needs_flip = FALSE;
else
needs_flip = cogl_is_offscreen (cogl_get_draw_framebuffer ());
cache = &ctx->builtin_flushed_projection;
}
else
{
needs_flip = FALSE;
if (mode == COGL_MATRIX_MODELVIEW)
cache = &ctx->builtin_flushed_modelview;
else
cache = NULL;
}
/* We don't need to do anything if the state is the same */
if (!cache ||
_cogl_matrix_stack_check_and_update_cache (stack, cache, needs_flip))
{
gboolean is_identity = state->is_identity && !needs_flip;
if (needs_flip)
{
CoglMatrix flipped_matrix;
cogl_matrix_multiply (&flipped_matrix,
&ctx->y_flip_matrix,
state->is_identity ?
&ctx->identity_matrix :
&state->matrix);
_cogl_matrix_stack_flush_matrix_to_gl_builtin (ctx,
/* not identity */
FALSE,
&flipped_matrix,
mode);
}
else
_cogl_matrix_stack_flush_matrix_to_gl_builtin (ctx,
is_identity,
&state->matrix,
mode);
}
}
#endif
}
CoglClipStack *
_cogl_clip_stack_push_rectangle (CoglClipStack *stack,
float x_1,
float y_1,
float x_2,
float y_2,
CoglMatrixEntry *modelview_entry,
CoglMatrixEntry *projection_entry,
const float *viewport)
{
CoglClipStackRect *entry;
CoglMatrix modelview;
CoglMatrix projection;
CoglMatrix modelview_projection;
/* Corners of the given rectangle in an clockwise order:
* (0, 1) (2, 3)
*
*
*
* (6, 7) (4, 5)
*/
float rect[] = {
x_1, y_1,
x_2, y_1,
x_2, y_2,
x_1, y_2
};
/* Make a new entry */
entry = _cogl_clip_stack_push_entry (stack,
sizeof (CoglClipStackRect),
COGL_CLIP_STACK_RECT);
entry->x0 = x_1;
entry->y0 = y_1;
entry->x1 = x_2;
entry->y1 = y_2;
entry->matrix_entry = cogl_matrix_entry_ref (modelview_entry);
cogl_matrix_entry_get (modelview_entry, &modelview);
cogl_matrix_entry_get (projection_entry, &projection);
cogl_matrix_multiply (&modelview_projection,
&projection,
&modelview);
/* Technically we could avoid the viewport transform at this point
* if we want to make this a bit faster. */
_cogl_transform_point (&modelview, &projection, viewport, &rect[0], &rect[1]);
_cogl_transform_point (&modelview, &projection, viewport, &rect[2], &rect[3]);
_cogl_transform_point (&modelview, &projection, viewport, &rect[4], &rect[5]);
_cogl_transform_point (&modelview, &projection, viewport, &rect[6], &rect[7]);
/* If the fully transformed rectangle isn't still axis aligned we
* can't handle it using a scissor.
*
* We don't use an epsilon here since we only really aim to catch
* simple cases where the transform doesn't leave the rectangle screen
* aligned and don't mind some false positives.
*/
if (rect[0] != rect[6] ||
rect[1] != rect[3] ||
rect[2] != rect[4] ||
rect[7] != rect[5])
{
entry->can_be_scissor = FALSE;
_cogl_clip_stack_entry_set_bounds ((CoglClipStack *) entry,
rect);
}
else
{
CoglClipStack *base_entry = (CoglClipStack *) entry;
x_1 = rect[0];
y_1 = rect[1];
x_2 = rect[4];
y_2 = rect[5];
/* Consider that the modelview matrix may flip the rectangle
* along the x or y axis... */
#define SWAP(A,B) do { float tmp = B; B = A; A = tmp; } while (0)
if (x_1 > x_2)
SWAP (x_1, x_2);
if (y_1 > y_2)
SWAP (y_1, y_2);
#undef SWAP
base_entry->bounds_x0 = COGL_UTIL_NEARBYINT (x_1);
base_entry->bounds_y0 = COGL_UTIL_NEARBYINT (y_1);
base_entry->bounds_x1 = COGL_UTIL_NEARBYINT (x_2);
base_entry->bounds_y1 = COGL_UTIL_NEARBYINT (y_2);
entry->can_be_scissor = TRUE;
}
return (CoglClipStack *) entry;
}
void
_cogl_matrix_entry_flush_to_gl_builtins (CoglContext *ctx,
CoglMatrixEntry *entry,
CoglMatrixMode mode,
CoglFramebuffer *framebuffer,
CoglBool disable_flip)
{
g_assert (_cogl_has_private_feature (ctx, COGL_PRIVATE_FEATURE_GL_FIXED));
#if defined (HAVE_COGL_GL) || defined (HAVE_COGL_GLES)
{
CoglBool needs_flip;
CoglMatrixEntryCache *cache;
if (mode == COGL_MATRIX_PROJECTION)
{
/* Because Cogl defines texture coordinates to have a top left
* origin and because offscreen framebuffers may be used for
* rendering to textures we always render upside down to
* offscreen buffers. Also for some backends we need to render
* onscreen buffers upside-down too.
*/
if (disable_flip)
needs_flip = FALSE;
else
needs_flip = cogl_is_offscreen (framebuffer);
cache = &ctx->builtin_flushed_projection;
}
else
{
needs_flip = FALSE;
if (mode == COGL_MATRIX_MODELVIEW)
cache = &ctx->builtin_flushed_modelview;
else
cache = NULL;
}
/* We don't need to do anything if the state is the same */
if (!cache ||
_cogl_matrix_entry_cache_maybe_update (cache, entry, needs_flip))
{
CoglBool is_identity;
CoglMatrix matrix;
if (entry->op == COGL_MATRIX_OP_LOAD_IDENTITY)
is_identity = TRUE;
else
{
is_identity = FALSE;
cogl_matrix_entry_get (entry, &matrix);
}
if (needs_flip)
{
CoglMatrix flipped_matrix;
cogl_matrix_multiply (&flipped_matrix,
&ctx->y_flip_matrix,
is_identity ?
&ctx->identity_matrix :
&matrix);
_cogl_matrix_flush_to_gl_builtin (ctx,
/* not identity */
FALSE,
&flipped_matrix,
mode);
}
else
{
_cogl_matrix_flush_to_gl_builtin (ctx,
is_identity,
&matrix,
mode);
}
}
}
#endif
}
/* This determines the appropriate level of detail to use when drawing the
* texture, in a way that corresponds to what the GL specification does
* when mip-mapping. This is probably fancier and slower than what we need,
* but we do the computation only once each time we paint a window, and
* its easier to just use the equations from the specification than to
* come up with something simpler.
*
* If window is being painted at an angle from the viewer, then we have to
* pick a point in the texture; we use the middle of the texture (which is
* why the width/height are passed in.) This is not the normal case for
* Meta.
*/
static int
get_paint_level (int width, int height)
{
CoglMatrix projection, modelview, pm;
float v[4];
double viewport_width, viewport_height;
double u0, v0;
double xc, yc, wc;
double dxdu_, dxdv_, dydu_, dydv_;
double det_, det_sq;
double rho_sq;
double lambda;
/* See
* http://www.opengl.org/registry/doc/glspec32.core.20090803.pdf
* Section 3.8.9, p. 1.6.2. Here we have
*
* u(x,y) = x_o;
* v(x,y) = y_o;
*
* Since we are mapping 1:1 from object coordinates into pixel
* texture coordinates, the clip coordinates are:
*
* (x_c) (x_o) (u)
* (y_c) = (M_projection)(M_modelview) (y_o) = (PM) (v)
* (z_c) (z_o) (0)
* (w_c) (w_o) (1)
*/
cogl_get_projection_matrix (&projection);
cogl_get_modelview_matrix (&modelview);
cogl_matrix_multiply (&pm, &projection, &modelview);
cogl_get_viewport (v);
viewport_width = v[2];
viewport_height = v[3];
u0 = width / 2.;
v0 = height / 2.;
xc = pm.xx * u0 + pm.xy * v0 + pm.xw;
yc = pm.yx * u0 + pm.yy * v0 + pm.yw;
wc = pm.wx * u0 + pm.wy * v0 + pm.ww;
/* We'll simplify the equations below for a bit of micro-optimization.
* The commented out code is the unsimplified version.
// Partial derivates of window coordinates:
//
// x_w = 0.5 * viewport_width * x_c / w_c + viewport_center_x
// y_w = 0.5 * viewport_height * y_c / w_c + viewport_center_y
//
// with respect to u, v, using
// d(a/b)/dx = da/dx * (1/b) - a * db/dx / (b^2)
dxdu = 0.5 * viewport_width * (pm.xx - pm.wx * (xc/wc)) / wc;
dxdv = 0.5 * viewport_width * (pm.xy - pm.wy * (xc/wc)) / wc;
dydu = 0.5 * viewport_height * (pm.yx - pm.wx * (yc/wc)) / wc;
dydv = 0.5 * viewport_height * (pm.yy - pm.wy * (yc/wc)) / wc;
// Compute the inverse partials as the matrix inverse
det = dxdu * dydv - dxdv * dydu;
dudx = dydv / det;
dudy = - dxdv / det;
dvdx = - dydu / det;
dvdy = dvdu / det;
// Scale factor; maximum of the distance in texels for a change of 1 pixel
// in the X direction or 1 pixel in the Y direction
rho = MAX (sqrt (dudx * dudx + dvdx * dvdx), sqrt(dudy * dudy + dvdy * dvdy));
// Level of detail
lambda = log2 (rho) + LOD_BIAS;
*/
/* dxdu * wc, etc */
dxdu_ = 0.5 * viewport_width * (pm.xx - pm.wx * (xc/wc));
dxdv_ = 0.5 * viewport_width * (pm.xy - pm.wy * (xc/wc));
dydu_ = 0.5 * viewport_height * (pm.yx - pm.wx * (yc/wc));
dydv_ = 0.5 * viewport_height * (pm.yy - pm.wy * (yc/wc));
/* det * wc^2 */
det_ = dxdu_ * dydv_ - dxdv_ * dydu_;
det_sq = det_ * det_;
if (det_sq == 0.0)
return -1;
/* (rho * det * wc)^2 */
rho_sq = MAX (dydv_ * dydv_ + dydu_ * dydu_, dxdv_ * dxdv_ + dxdu_ * dxdu_);
lambda = 0.5 * M_LOG2E * log (rho_sq * wc * wc / det_sq) + LOD_BIAS;
#if 0
g_print ("%g %g %g\n", 0.5 * viewport_width * pm.xx / pm.ww, 0.5 * viewport_height * pm.yy / pm.ww, lambda);
#endif
if (lambda <= 0.)
return 0;
else
return (int)(0.5 + lambda);
}
