+++ /dev/null
-/*
- * GL_ARB_texture_cube_map demo
- *
- * Brian Paul
- * May 2000
- *
- *
- * Copyright (C) 2000 Brian Paul All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-
-/*
- * This is a pretty minimalistic demo for now. Eventually, use some
- * interesting cube map textures and 3D objects.
- * For now, we use 6 checkerboard "walls" and a sphere (good for
- * verification purposes).
- */
-
-
-#include <assert.h>
-#include <math.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <GL/glew.h>
-#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;
-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 GLboolean supportFBO = GL_FALSE;
-static GLboolean supportSeamless = GL_FALSE;
-static GLboolean seamless = GL_FALSE;
-static GLuint TexObj = 0;
-static GLint T0 = 0;
-static GLint Frames = 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]))
-
-
-
-/* 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[] = {
- /* +X side */
- 1.0, -eps1, -eps1,
- 1.0, -eps1, eps1,
- 1.0, eps1, eps1,
- 1.0, eps1, -eps1,
-
- /* -X side */
- -1.0, eps1, -eps1,
- -1.0, eps1, eps1,
- -1.0, -eps1, eps1,
- -1.0, -eps1, -eps1,
-
- /* +Y side */
- -eps1, 1.0, -eps1,
- -eps1, 1.0, eps1,
- eps1, 1.0, eps1,
- eps1, 1.0, -eps1,
-
- /* -Y side */
- -eps1, -1.0, -eps1,
- -eps1, -1.0, eps1,
- eps1, -1.0, eps1,
- eps1, -1.0, -eps1,
-
- /* +Z side */
- eps1, -eps1, 1.0,
- -eps1, -eps1, 1.0,
- -eps1, eps1, 1.0,
- eps1, eps1, 1.0,
-
- /* -Z side */
- eps1, eps1, -1.0,
- -eps1, eps1, -1.0,
- -eps1, -eps1, -1.0,
- eps1, -eps1, -1.0,
-};
-
-static const GLfloat vtx_coords[] = {
- /* +X side */
- br, -br, -br,
- br, -br, br,
- br, br, br,
- br, br, -br,
-
- /* -X side */
- -br, br, -br,
- -br, br, br,
- -br, -br, br,
- -br, -br, -br,
-
- /* +Y side */
- -br, br, -br,
- -br, br, br,
- br, br, br,
- br, br, -br,
-
- /* -Y side */
- -br, -br, -br,
- -br, -br, br,
- br, -br, br,
- br, -br, -br,
-
- /* +Z side */
- br, -br, br,
- -br, -br, br,
- -br, br, br,
- br, br, br,
-
- /* -Z side */
- br, br, -br,
- -br, br, -br,
- -br, -br, -br,
- br, -br, -br,
-};
-
-static void draw_skybox( void )
-{
- if ( use_vertex_arrays ) {
- glTexCoordPointer( 3, GL_FLOAT, 0, tex_coords );
- glVertexPointer( 3, GL_FLOAT, 0, vtx_coords );
-
- glEnableClientState( GL_TEXTURE_COORD_ARRAY );
- glEnableClientState( GL_VERTEX_ARRAY );
-
- glDrawArrays( GL_QUADS, 0, 24 );
-
- glDisableClientState( GL_TEXTURE_COORD_ARRAY );
- glDisableClientState( GL_VERTEX_ARRAY );
- }
- else {
- unsigned i;
-
- glBegin(GL_QUADS);
- for ( i = 0 ; i < 24 ; i++ ) {
- glTexCoord3fv( & tex_coords[ i * 3 ] );
- glVertex3fv ( & vtx_coords[ i * 3 ] );
- }
- glEnd();
- }
-}
-
-
-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
- * every frame.
- * We can simply skip clearing of the color buffer in this case.
- * For the depth buffer, we alternately use a different subrange of
- * the depth buffer for each frame. For the odd frame use the range
- * [0, 0.5] with GL_LESS. For the even frames, use the range [1, 0.5]
- * with GL_GREATER.
- */
- FrameParity = 1 - FrameParity;
- if (FrameParity) {
- glDepthRange(0.0, 0.5);
- glDepthFunc(GL_LESS);
- }
- else {
- glDepthRange(1.0, 0.5);
- glDepthFunc(GL_GREATER);
- }
- }
- else {
- /* ordinary clearing */
- 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);
-
- 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);
- glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_R, wrap);
-
- glPushMatrix(); /*MODELVIEW*/
- glTranslatef( 0.0, 0.0, -EyeDist );
-
- /* skybox */
- glDisable(GL_TEXTURE_GEN_S);
- glDisable(GL_TEXTURE_GEN_T);
- glDisable(GL_TEXTURE_GEN_R);
-
- glMatrixMode(GL_MODELVIEW);
- glPushMatrix();
- glRotatef(Xrot, 1, 0, 0);
- glRotatef(Yrot, 0, 1, 0);
- draw_skybox();
- glPopMatrix();
-
- /* sphere */
- glMatrixMode(GL_TEXTURE);
- glLoadIdentity();
- glRotatef(-Yrot, 0, 1, 0);
- glRotatef(-Xrot, 1, 0, 0);
-
- glEnable(GL_TEXTURE_GEN_S);
- glEnable(GL_TEXTURE_GEN_T);
- glEnable(GL_TEXTURE_GEN_R);
- glutSolidSphere(2.0, 20, 20);
-
- glLoadIdentity(); /* texture */
-
- glMatrixMode(GL_MODELVIEW);
- glPopMatrix();
-
- glutSwapBuffers();
-
- Frames++;
-
- {
- GLint t = glutGet(GLUT_ELAPSED_TIME);
- if (t - T0 >= 5000) {
- GLfloat seconds = (t - T0) / 1000.0;
- GLfloat fps = Frames / seconds;
- printf("%d frames in %6.3f seconds = %6.3f FPS\n", Frames, seconds, fps);
- fflush(stdout);
- T0 = t;
- Frames = 0;
- }
- }
-}
-
-
-static void idle(void)
-{
- GLfloat t = 0.05 * glutGet(GLUT_ELAPSED_TIME);
- Yrot = t;
- glutPostRedisplay();
-}
-
-
-static void set_mode(GLuint mode)
-{
- if (mode == 0) {
- glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_REFLECTION_MAP_ARB);
- glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_REFLECTION_MAP_ARB);
- glTexGeni(GL_R, GL_TEXTURE_GEN_MODE, GL_REFLECTION_MAP_ARB);
- printf("GL_REFLECTION_MAP_ARB mode\n");
- }
- else if (mode == 1) {
- glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_NORMAL_MAP_ARB);
- glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_NORMAL_MAP_ARB);
- glTexGeni(GL_R, GL_TEXTURE_GEN_MODE, GL_NORMAL_MAP_ARB);
- printf("GL_NORMAL_MAP_ARB mode\n");
- }
-}
-
-
-static void key(unsigned char k, int x, int y)
-{
- static GLuint mode = 0;
- (void) x;
- (void) y;
- switch (k) {
- case ' ':
- anim = !anim;
- if (anim)
- glutIdleFunc(idle);
- 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);
- 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",
- (use_vertex_arrays) ? "en" : "dis" );
- break;
- case 'z':
- EyeDist -= 0.5;
- if (EyeDist < 6.0)
- EyeDist = 6.0;
- break;
- case 'Z':
- EyeDist += 0.5;
- if (EyeDist > 90.0)
- EyeDist = 90;
- break;
- case 27:
- exit(0);
- }
- glutPostRedisplay();
-}
-
-
-static void specialkey(int key, int x, int y)
-{
- GLfloat step = 5;
- (void) x;
- (void) y;
- switch (key) {
- case GLUT_KEY_UP:
- Xrot += step;
- break;
- case GLUT_KEY_DOWN:
- Xrot -= step;
- break;
- case GLUT_KEY_LEFT:
- Yrot -= step;
- break;
- case GLUT_KEY_RIGHT:
- Yrot += step;
- break;
- }
- glutPostRedisplay();
-}
-
-
-/* new window size or exposure */
-static void reshape(int width, int height)
-{
- GLfloat ar = (float) width / (float) height;
- glViewport(0, 0, (GLint)width, (GLint)height);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- glFrustum( -2.0*ar, 2.0*ar, -2.0, 2.0, 4.0, 100.0 );
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
-}
-
-
-static void init_checkers( void )
-{
-#define CUBE_TEX_SIZE 64
- 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 */
- { 0, 255, 0 }, /* face 2 - green */
- { 255, 0, 255 }, /* face 3 - purple */
- { 0, 0, 255 }, /* face 4 - blue */
- { 255, 255, 0 } /* face 5 - yellow */
- };
- static const GLenum targets[6] = {
- GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB,
- GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB,
- GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB,
- GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB,
- GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB,
- GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB
- };
-
- GLint i, j, f;
-
- glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-
- if (!supportFBO)
- glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
-
-
- /* make colored checkerboard cube faces */
- for (f = 0; f < 6; f++) {
- 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][2];
- image[i][j][1] = colors[f][1];
- 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_RGBA8, CUBE_TEX_SIZE, CUBE_TEX_SIZE, 0,
- GL_BGRA, GL_UNSIGNED_BYTE, image);
- }
-
- if (supportFBO)
- glGenerateMipmapEXT(GL_TEXTURE_CUBE_MAP_ARB);
-}
-
-
-static void load(GLenum target, const char *filename,
- GLboolean flipTB, GLboolean flipLR)
-{
- GLint w, h;
- GLenum format;
- GLubyte *img = LoadRGBImage( filename, &w, &h, &format );
- if (!img) {
- printf("Error: couldn't load texture image %s\n", filename);
- exit(1);
- }
- assert(format == GL_RGB);
-
- /* <sigh> the way the texture cube mapping works, we have to flip
- * images to make things look right.
- */
- if (flipTB) {
- const int stride = 3 * w;
- GLubyte temp[3*1024];
- int i;
- for (i = 0; i < h / 2; i++) {
- memcpy(temp, img + i * stride, stride);
- memcpy(img + i * stride, img + (h - i - 1) * stride, stride);
- memcpy(img + (h - i - 1) * stride, temp, stride);
- }
- }
- if (flipLR) {
- const int stride = 3 * w;
- GLubyte temp[3];
- GLubyte *row;
- int i, j;
- for (i = 0; i < h; i++) {
- row = img + i * stride;
- for (j = 0; j < w / 2; j++) {
- int k = w - j - 1;
- temp[0] = row[j*3+0];
- temp[1] = row[j*3+1];
- temp[2] = row[j*3+2];
- row[j*3+0] = row[k*3+0];
- row[j*3+1] = row[k*3+1];
- row[j*3+2] = row[k*3+2];
- row[k*3+0] = temp[0];
- row[k*3+1] = temp[1];
- row[k*3+2] = temp[2];
- }
- }
- }
-
- gluBuild2DMipmaps(target, GL_RGB, w, h, format, GL_UNSIGNED_BYTE, img);
- free(img);
-}
-
-
-static void load_envmaps(void)
-{
- load(GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB, "right.rgb", GL_TRUE, GL_FALSE);
- load(GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB, "left.rgb", GL_TRUE, GL_FALSE);
- load(GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB, "top.rgb", GL_FALSE, GL_TRUE);
- load(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB, "bottom.rgb", GL_FALSE, GL_TRUE);
- load(GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB, "front.rgb", GL_TRUE, GL_FALSE);
- load(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB, "back.rgb", GL_TRUE, GL_FALSE);
-}
-
-
-static void init( GLboolean useImageFiles )
-{
- /* check for extensions */
- 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));
-
-
- glGenTextures(1, &TexObj);
- glBindTexture(GL_TEXTURE_CUBE_MAP_ARB, TexObj);
-
- if (useImageFiles) {
- load_envmaps();
- }
- else {
- init_checkers();
- }
-
- glEnable(GL_TEXTURE_CUBE_MAP_ARB);
- glEnable(GL_DEPTH_TEST);
-
- glClearColor(.3, .3, .3, 0);
- glColor3f( 1.0, 1.0, 1.0 );
-
- set_mode(0);
-}
-
-
-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");
-}
-
-
-static void parse_args(int argc, char *argv[])
-{
- int initFlag = 0;
- int i;
-
- for (i = 1; i < argc; i++) {
- if (strcmp(argv[i], "-i") == 0)
- initFlag = 1;
- else if (strcmp(argv[i], "--noclear") == 0)
- NoClear = GL_TRUE;
- else {
- fprintf(stderr, "Bad option: %s\n", argv[i]);
- exit(1);
- }
- }
- init (initFlag);
-}
-
-int main( int argc, char *argv[] )
-{
- glutInitWindowSize(600, 500);
- glutInit(&argc, argv);
- glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
- glutCreateWindow("Texture Cube Mapping");
- glewInit();
- glutReshapeFunc( reshape );
- glutKeyboardFunc( key );
- glutSpecialFunc( specialkey );
- glutDisplayFunc( draw );
- if (anim)
- glutIdleFunc(idle);
- parse_args(argc, argv);
- usage();
- glutMainLoop();
- return 0;
-}
projects / mesa.git / blobdiff