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add fill_ratio

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This commit is contained in:
David Rose 2004-02-26 18:46:44 +00:00
parent fd8bc506d3
commit 9f57cfa1b2
2 changed files with 24 additions and 5 deletions
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24
panda/src/distort/projectionScreen.cxx
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@ -163,10 +163,22 @@ set_projector(const NodePath &projector) {
// and vertical dimension of the projector,
// respectively; distance represents the approximate
// distance of the screen from the lens center.
//
// The fill_ratio parameter specifies the fraction of
// the image to cover. If it is 1.0, the entire image
// is shown full-size; if it is 0.9, 10% of the image
// around the edges is not part of the grid (and the
// grid is drawn smaller by the same 10%). This is
// intended to work around graphics drivers that tend to
// show dark edges or other unsatisfactory artifacts
// around the edges of textures: render the texture
// larger than necessary by a certain fraction, and make
// the screen smaller by the inverse fraction.
////////////////////////////////////////////////////////////////////
PT(GeomNode) ProjectionScreen::
generate_screen(const NodePath &projector, const string &screen_name,
int num_x_verts, int num_y_verts, float distance) {
int num_x_verts, int num_y_verts, float distance,
float fill_ratio) {
nassertr(!projector.is_empty() &&
projector.node()->is_of_type(LensNode::get_class_type()),
NULL);
@ -188,10 +200,15 @@ generate_screen(const NodePath &projector, const string &screen_name,
coords.reserve(num_verts);
float x_scale = 2.0f / (num_x_verts - 1);
float y_scale = 2.0f / (num_y_verts - 1);
for (int yi = 0; yi < num_y_verts; yi++) {
for (int xi = 0; xi < num_x_verts; xi++) {
LPoint2f film = LPoint2f((float)xi * x_scale - 1.0f,
(float)yi * y_scale - 1.0f);
// Reduce the image by the fill ratio.
film *= fill_ratio;
LPoint3f near_point, far_point;
lens->extrude(film, near_point, far_point);
@ -264,14 +281,15 @@ generate_screen(const NodePath &projector, const string &screen_name,
////////////////////////////////////////////////////////////////////
void ProjectionScreen::
regenerate_screen(const NodePath &projector, const string &screen_name,
int num_x_verts, int num_y_verts, float distance) {
int num_x_verts, int num_y_verts, float distance,
float fill_ratio) {
// First, remove all existing children.
remove_all_children();
// And attach a new child.
PT(GeomNode) geom_node =
generate_screen(projector, screen_name, num_x_verts, num_y_verts,
distance);
distance, fill_ratio);
add_child(geom_node);
}

5
panda/src/distort/projectionScreen.h
View File

@ -67,9 +67,10 @@ PUBLISHED:
PT(GeomNode) generate_screen(const NodePath &projector,
const string &screen_name,
int num_x_verts, int num_y_verts,
float distance);
float distance, float fill_ratio);
void regenerate_screen(const NodePath &projector, const string &screen_name,
int num_x_verts, int num_y_verts, float distance);
int num_x_verts, int num_y_verts, float distance,
float fill_ratio);
PT(PandaNode) make_flat_mesh(const NodePath &camera);
INLINE void set_invert_uvs(bool invert_uvs);