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demos/cubemap: Add support for GL_ARB_seamless_cube_map

This commit is contained in:
Ian Romanick 2009-08-14 16:26:59 -07:00
parent 06ae1db4a9
commit 8b0b33530c
1 changed files with 39 additions and 17 deletions
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56
progs/demos/cubemap.c
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@ -43,6 +43,9 @@
#include "GL/glut.h"
#include "readtex.h"
#ifndef GL_TEXTURE_CUBE_MAP_SEAMLESS
#define GL_TEXTURE_CUBE_MAP_SEAMLESS 0x884F
#endif
static GLfloat Xrot = 0, Yrot = 0;
static GLfloat EyeDist = 10;
@ -53,6 +56,8 @@ static GLint FrameParity = 0;
static GLenum FilterIndex = 0;
static GLint ClampIndex = 0;
static GLboolean supportFBO = GL_FALSE;
static GLboolean supportSeamless = GL_FALSE;
static GLboolean seamless = GL_FALSE;
static struct {
@ -91,7 +96,9 @@ static struct {
#define eps1 0.99
/* The effects of GL_ARB_seamless_cube_map don't show up unless eps1 is 1.0.
*/
#define eps1 1.0 /*0.99*/
#define br 20.0 /* box radius */
static const GLfloat tex_coords[] = {
@ -231,6 +238,13 @@ static void draw( void )
glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MAG_FILTER,
FilterModes[FilterIndex].mag_mode);
if (supportSeamless) {
if (seamless) {
glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
} else {
glDisable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
}
}
wrap = ClampModes[ClampIndex].mode;
glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_S, wrap);
glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_T, wrap);
@ -321,6 +335,11 @@ static void key(unsigned char k, int x, int y)
mode = !mode;
set_mode(mode);
break;
case 's':
seamless = ! seamless;
printf("Seamless cube map filtering is %sabled\n",
(seamless) ? "en" : "dis" );
break;
case 'v':
use_vertex_arrays = ! use_vertex_arrays;
printf( "Vertex arrays are %sabled\n",
@ -502,23 +521,26 @@ static void load_envmaps(void)
static void init( GLboolean useImageFiles )
{
/* check for extensions */
{
char *exten = (char *) glGetString(GL_EXTENSIONS);
if (!strstr(exten, "GL_ARB_texture_cube_map")) {
printf("Sorry, this demo requires GL_ARB_texture_cube_map\n");
exit(0);
}
/* Needed for glGenerateMipmapEXT / auto mipmapping
*/
if (strstr(exten, "GL_EXT_framebuffer_object")) {
supportFBO = GL_TRUE;
}
else if (!strstr(exten, "GL_SGIS_generate_mipmap")) {
printf("Sorry, this demo requires GL_EXT_framebuffer_object or GL_SGIS_generate_mipmap\n");
exit(0);
}
if (!GLEW_ARB_texture_cube_map) {
printf("Sorry, this demo requires GL_ARB_texture_cube_map\n");
exit(0);
}
/* Needed for glGenerateMipmapEXT / auto mipmapping
*/
supportFBO = GLEW_EXT_framebuffer_object;
if (!supportFBO && !GLEW_SGIS_generate_mipmap) {
printf("Sorry, this demo requires GL_EXT_framebuffer_object or "
"GL_SGIS_generate_mipmap\n");
exit(0);
}
/* GLEW doesn't know about this extension yet, so use the old GLUT function
* to check for availability.
*/
supportSeamless = glutExtensionSupported("GL_ARB_seamless_cube_map");
printf("GL_RENDERER: %s\n", (char *) glGetString(GL_RENDERER));
if (useImageFiles) {