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Additional functionality for animated point lights (i.e. approach light

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rabbits, REIL, VASI/PAPI, etc.)

This allows the calling layer (i.e. FlightGear) better control over the use
of OpenGL point drawing extensions.
This commit is contained in:
curt
2006-07-21 15:45:01 +00:00
parent 40ad2b155a
commit 5127990a43
2 changed files with 84 additions and 2 deletions
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79
simgear/scene/tgdb/pt_lights.cxx
View File

@@ -25,18 +25,78 @@
#endif
#include <plib/sg.h>
#include <plib/ssg.h>
#include <simgear/scene/material/mat.hxx>
#include <simgear/screen/extensions.hxx>
#include "vasi.hxx"
#include "pt_lights.hxx"
// static variables for use in ssg callbacks
static bool extensions_checked = false;
static bool glPointParameterIsSupported = false;
static glPointParameterfProc glPointParameterfPtr;
static glPointParameterfvProc glPointParameterfvPtr;
static bool SGPointLightsUseSprites = false;
static bool SGPointLightsEnhancedLighting = false;
static bool SGPointLightsDistanceAttenuation = false;
// Specify the way we want to draw directional point lights (assuming the
// appropriate extensions are available.)
void sgConfigureDirectionalLights( bool use_point_sprites,
bool enhanced_lighting,
bool distance_attenuation ) {
SGPointLightsUseSprites = use_point_sprites;
SGPointLightsEnhancedLighting = enhanced_lighting;
SGPointLightsDistanceAttenuation = distance_attenuation;
}
// runtime check for the availability of various opengl extensions.
static void check_for_extensions() {
// get the address of our OpenGL extensions
if (SGIsOpenGLExtensionSupported("GL_EXT_point_parameters") ) {
glPointParameterIsSupported = true;
glPointParameterfPtr = (glPointParameterfProc)
SGLookupFunction("glPointParameterfEXT");
glPointParameterfvPtr = (glPointParameterfvProc)
SGLookupFunction("glPointParameterfvEXT");
} else if ( SGIsOpenGLExtensionSupported("GL_ARB_point_parameters") ) {
glPointParameterIsSupported = true;
glPointParameterfPtr = (glPointParameterfProc)
SGLookupFunction("glPointParameterfARB");
glPointParameterfvPtr = (glPointParameterfvProc)
SGLookupFunction("glPointParameterfvARB");
} else {
glPointParameterIsSupported = false;
}
}
// strobe pre-draw (we want a larger point size)
static int StrobePreDraw( ssgEntity *e ) {
// check for the availability of point parameter extension, but
// just once.
if ( !extensions_checked ) {
check_for_extensions();
extensions_checked = true;
}
glPushAttrib( GL_POINT_BIT );
glPointSize(4.0);
if ( glPointParameterIsSupported && SGPointLightsEnhancedLighting ) {
if ( SGPointLightsUseSprites ) {
glPointSize(10.0);
} else {
glPointSize(8.0);
}
} else {
glPointSize(4.0);
}
glEnable(GL_POINT_SMOOTH);
return true;
@@ -52,8 +112,23 @@ static int StrobePostDraw( ssgEntity *e ) {
// vasi pre-draw (we want a larger point size)
static int VASIPreDraw( ssgEntity *e ) {
// check for the availability of point parameter extension, but
// just once.
if ( !extensions_checked ) {
check_for_extensions();
extensions_checked = true;
}
glPushAttrib( GL_POINT_BIT );
glPointSize(2.0);
if ( glPointParameterIsSupported && SGPointLightsEnhancedLighting ) {
if ( SGPointLightsUseSprites ) {
glPointSize(10.0);
} else {
glPointSize(8.0);
}
} else {
glPointSize(4.0);
}
glEnable(GL_POINT_SMOOTH);
return true;

7
simgear/scene/tgdb/pt_lights.hxx
View File

@@ -90,5 +90,12 @@ ssgBranch *sgMakeDirectionalLights( const point_list &nodes,
const string &material,
sgdVec3 dup );
// Specify the way we want to draw directional point lights (assuming the
// appropriate extensions are available.)
void sgConfigureDirectionalLights( bool use_point_sprites,
bool enhanced_lighting,
bool distance_attenuation );
#endif // _SG_PT_LIGHTS_HXX