diff options
Diffstat (limited to 'progs/demos/cubemap.c')
| -rw-r--r-- | progs/demos/cubemap.c | 95 |
1 files changed, 80 insertions, 15 deletions
diff --git a/progs/demos/cubemap.c b/progs/demos/cubemap.c index b3bdd64f68d..26db42aed5e 100644 --- a/progs/demos/cubemap.c +++ b/progs/demos/cubemap.c @@ -39,6 +39,7 @@ #include <stdio.h> #include <stdlib.h> #include <string.h> +#include <GL/glew.h> #include "GL/glut.h" #include "readtex.h" @@ -49,6 +50,45 @@ static GLboolean use_vertex_arrays = GL_FALSE; static GLboolean anim = GL_TRUE; static GLboolean NoClear = GL_FALSE; static GLint FrameParity = 0; +static GLenum FilterIndex = 0; +static GLint ClampIndex = 0; + + +static struct { + GLenum mode; + const char *name; +} ClampModes[] = { + { GL_CLAMP_TO_EDGE, "GL_CLAMP_TO_EDGE" }, + { GL_CLAMP_TO_BORDER, "GL_CLAMP_TO_BORDER" }, + { GL_CLAMP, "GL_CLAMP" }, + { GL_REPEAT, "GL_REPEAT" } +}; + +#define NUM_CLAMP_MODES (sizeof(ClampModes) / sizeof(ClampModes[0])) + + +static struct { + GLenum mag_mode, min_mode; + const char *name; +} FilterModes[] = { + { GL_NEAREST, GL_NEAREST, "GL_NEAREST, GL_NEAREST" }, + { GL_NEAREST, GL_LINEAR, "GL_NEAREST, GL_LINEAR" }, + { GL_NEAREST, GL_NEAREST_MIPMAP_NEAREST, "GL_NEAREST, GL_NEAREST_MIPMAP_NEAREST" }, + { GL_NEAREST, GL_NEAREST_MIPMAP_LINEAR, "GL_NEAREST, GL_NEAREST_MIPMAP_LINEAR" }, + { GL_NEAREST, GL_LINEAR_MIPMAP_NEAREST, "GL_NEAREST, GL_LINEAR_MIPMAP_NEAREST" }, + { GL_NEAREST, GL_LINEAR_MIPMAP_LINEAR, "GL_NEAREST, GL_LINEAR_MIPMAP_LINEAR" }, + + { GL_LINEAR, GL_NEAREST, "GL_LINEAR, GL_NEAREST" }, + { GL_LINEAR, GL_LINEAR, "GL_LINEAR, GL_LINEAR" }, + { GL_LINEAR, GL_NEAREST_MIPMAP_NEAREST, "GL_LINEAR, GL_NEAREST_MIPMAP_NEAREST" }, + { GL_LINEAR, GL_NEAREST_MIPMAP_LINEAR, "GL_LINEAR, GL_NEAREST_MIPMAP_LINEAR" }, + { GL_LINEAR, GL_LINEAR_MIPMAP_NEAREST, "GL_LINEAR, GL_LINEAR_MIPMAP_NEAREST" }, + { GL_LINEAR, GL_LINEAR_MIPMAP_LINEAR, "GL_LINEAR, GL_LINEAR_MIPMAP_LINEAR" } +}; + +#define NUM_FILTER_MODES (sizeof(FilterModes) / sizeof(FilterModes[0])) + + #define eps1 0.99 #define br 20.0 /* box radius */ @@ -158,6 +198,8 @@ static void draw_skybox( void ) static void draw( void ) { + GLenum wrap; + if (NoClear) { /* This demonstrates how we can avoid calling glClear. * This method only works if every pixel in the window is painted for @@ -183,6 +225,16 @@ static void draw( void ) glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); } + glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MIN_FILTER, + FilterModes[FilterIndex].min_mode); + glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MAG_FILTER, + FilterModes[FilterIndex].mag_mode); + + 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); + glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_R, wrap); + glPushMatrix(); /*MODELVIEW*/ glTranslatef( 0.0, 0.0, -EyeDist ); @@ -256,6 +308,14 @@ static void key(unsigned char k, int x, int y) else glutIdleFunc(NULL); break; + case 'f': + FilterIndex = (FilterIndex + 1) % NUM_FILTER_MODES; + printf("Tex filter: %s\n", FilterModes[FilterIndex].name); + break; + case 'c': + ClampIndex = (ClampIndex + 1) % NUM_CLAMP_MODES; + printf("Tex wrap mode: %s\n", ClampModes[ClampIndex].name); + break; case 'm': mode = !mode; set_mode(mode); @@ -321,7 +381,7 @@ static void reshape(int width, int height) static void init_checkers( void ) { #define CUBE_TEX_SIZE 64 - GLubyte image[CUBE_TEX_SIZE][CUBE_TEX_SIZE][3]; + GLubyte image[CUBE_TEX_SIZE][CUBE_TEX_SIZE][4]; static const GLubyte colors[6][3] = { { 255, 0, 0 }, /* face 0 - red */ { 0, 255, 255 }, /* face 1 - cyan */ @@ -348,21 +408,25 @@ static void init_checkers( void ) for (i = 0; i < CUBE_TEX_SIZE; i++) { for (j = 0; j < CUBE_TEX_SIZE; j++) { if ((i/4 + j/4) & 1) { - image[i][j][0] = colors[f][0]; + image[i][j][0] = colors[f][2]; image[i][j][1] = colors[f][1]; - image[i][j][2] = colors[f][2]; + image[i][j][2] = colors[f][0]; + image[i][j][3] = 255; } else { image[i][j][0] = 255; image[i][j][1] = 255; image[i][j][2] = 255; + image[i][j][3] = 255; } } } - glTexImage2D(targets[f], 0, GL_RGB, CUBE_TEX_SIZE, CUBE_TEX_SIZE, 0, - GL_RGB, GL_UNSIGNED_BYTE, image); + glTexImage2D(targets[f], 0, GL_RGBA8, CUBE_TEX_SIZE, CUBE_TEX_SIZE, 0, + GL_BGRA, GL_UNSIGNED_BYTE, image); } + + glGenerateMipmapEXT(GL_TEXTURE_CUBE_MAP_ARB); } @@ -431,32 +495,30 @@ static void load_envmaps(void) static void init( GLboolean useImageFiles ) { - GLenum filter; - - /* check for extension */ + /* 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 + */ + if (!strstr(exten, "GL_EXT_framebuffer_object")) { + printf("Sorry, this demo requires GL_EXT_framebuffer_object\n"); + exit(0); + } } printf("GL_RENDERER: %s\n", (char *) glGetString(GL_RENDERER)); if (useImageFiles) { load_envmaps(); - filter = GL_LINEAR; } else { init_checkers(); - filter = GL_NEAREST; } - glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MIN_FILTER, filter); - glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MAG_FILTER, filter); - glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); - glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); - glEnable(GL_TEXTURE_CUBE_MAP_ARB); glEnable(GL_DEPTH_TEST); @@ -472,6 +534,8 @@ static void usage(void) printf("keys:\n"); printf(" SPACE - toggle animation\n"); printf(" CURSOR KEYS - rotation\n"); + printf(" c - toggle texture clamp/wrap mode\n"); + printf(" f - toggle texture filter mode\n"); printf(" m - toggle texgen reflection mode\n"); printf(" z/Z - change viewing distance\n"); } @@ -502,6 +566,7 @@ int main( int argc, char *argv[] ) glutInitWindowSize(600, 500); glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE ); glutCreateWindow("Texture Cube Mapping"); + glewInit(); glutReshapeFunc( reshape ); glutKeyboardFunc( key ); glutSpecialFunc( specialkey ); 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