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Use a different way to call OpenGL extensions and move over to our own extension checking function instead of the one provided by glut

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This commit is contained in:
ehofman 2003-06-18 09:19:41 +00:00
parent 654037b83b
commit 6b2b6edb2d
1 changed files with 11 additions and 33 deletions
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40
src/Main/main.cxx
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@ -143,23 +143,8 @@ SG_USING_STD(endl);
#include "fg_commands.hxx"
#ifdef WIN32
typedef void (APIENTRY * PFNGLPOINTPARAMETERFEXTPROC)(GLenum pname,
GLfloat param);
typedef void (APIENTRY * PFNGLPOINTPARAMETERFVEXTPROC)(GLenum pname,
const GLfloat *params);
PFNGLPOINTPARAMETERFEXTPROC glPointParameterfEXT = 0;
PFNGLPOINTPARAMETERFVEXTPROC glPointParameterfvEXT = 0;
#elif linux
#include <GL/glx.h>
typedef void (* OpenGLFuncExt)(GLenum pname, GLfloat param);
typedef void (* OpenGLFuncExtv)(GLenum pname, const GLfloat *params);
OpenGLFuncExt glPointParameterfEXT = 0;
OpenGLFuncExtv glPointParameterfvEXT = 0;
#endif
glPointParameterfProc glPointParameterfPtr;
glPointParameterfvProc glPointParameterfvPtr;
float default_attenuation[3] = {1.0, 0.0, 0.0};
//Required for using GL_extensions
@ -783,15 +768,15 @@ void fgRenderFrame() {
glEnable(GL_POINT_SMOOTH);
if ( fgGetBool("/sim/rendering/distance-attenuation")
&& glutExtensionSupported("GL_EXT_point_parameters") )
&& SGIsOpenGLExtensionSupported("GL_EXT_point_parameters") )
{
// Enable states for drawing points with GL_extension
glEnable(GL_POINT_SMOOTH);
float quadratic[3] = {1.0, 0.001, 0.0000001};
// makes the points fade as they move away
glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT, quadratic);
glPointParameterfEXT(GL_POINT_SIZE_MIN_EXT, 1.0);
glPointParameterfvPtr(GL_DISTANCE_ATTENUATION_EXT, quadratic);
glPointParameterfPtr(GL_POINT_SIZE_MIN_EXT, 1.0);
}
glPointSize(4.0);
@ -837,9 +822,9 @@ void fgRenderFrame() {
if (fgGetBool("/sim/rendering/enhanced-lighting")) {
if ( fgGetBool("/sim/rendering/distance-attenuation")
&& glutExtensionSupported("GL_EXT_point_parameters") )
&& SGIsOpenGLExtensionSupported("GL_EXT_point_parameters") )
{
glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT,
glPointParameterfvPtr(GL_DISTANCE_ATTENUATION_EXT,
default_attenuation);
}
@ -1669,17 +1654,10 @@ static bool fgMainInit( int argc, char **argv ) {
// get the address of our OpenGL extensions
if ( fgGetBool("/sim/rendering/distance-attenuation") )
{
#ifdef WIN32
glPointParameterfEXT = (PFNGLPOINTPARAMETERFEXTPROC)
glPointParameterfPtr = (glPointParameterfProc)
SGLookupFunction("glPointParameterfEXT");
glPointParameterfvEXT = (PFNGLPOINTPARAMETERFVEXTPROC)
glPointParameterfvPtr = (glPointParameterfvProc)
SGLookupFunction("glPointParameterfvEXT");
#elif linux
glPointParameterfEXT = (OpenGLFuncExt)
SGLookupFunction("glPointParameterfEXT");
glPointParameterfvEXT = (OpenGLFuncExtv)
SGLookupFunction("glPointParameterfvEXT");
#endif
}
// based on the requested presets, calculate the true starting