+++ /dev/null
-/*
- * Simple test of multiple textures
- */
-
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-#include <GL/glew.h>
-#include <GL/glut.h>
-#include "readtex.h"
-
-#define TEST_CLAMP 0
-#define TEST_MIPMAPS 0
-#define TEST_GEN_COMPRESSED_MIPMAPS 0
-
-#define MAX_TEXTURES 8
-
-
-static int Win;
-static GLfloat Xrot = 0, Yrot = 0, Zrot = 0;
-static GLboolean Anim = GL_TRUE;
-static GLboolean Blend = GL_FALSE;
-static GLuint Filter = 0;
-static GLboolean Clamp = GL_FALSE;
-
-static GLuint NumTextures;
-static GLuint Textures[MAX_TEXTURES];
-static float TexRot[MAX_TEXTURES][3];
-static float TexPos[MAX_TEXTURES][3];
-static float TexAspect[MAX_TEXTURES];
-
-static const char *DefaultFiles[] = {
- "../images/arch.rgb",
- "../images/reflect.rgb",
- "../images/tree2.rgba",
- "../images/tile.rgb"
-};
-
-
-#define NUM_FILTERS 5
-static
-struct filter {
- GLenum min, mag;
- const char *name;
-} FilterModes[NUM_FILTERS] = {
- { GL_NEAREST, GL_NEAREST, "Nearest,Nearest" },
- { GL_LINEAR, GL_LINEAR, "Linear,Linear" },
- { GL_NEAREST_MIPMAP_NEAREST, GL_NEAREST, "NearestMipmapNearest,Nearest" },
- { GL_LINEAR_MIPMAP_NEAREST, GL_LINEAR, "LinearMipmapNearest,Linear" },
- { GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR, "LinearMipmapLinear,Linear" }
-};
-
-
-
-
-static void
-Idle(void)
-{
- Xrot = glutGet(GLUT_ELAPSED_TIME) * 0.02;
- Yrot = glutGet(GLUT_ELAPSED_TIME) * 0.04;
- /* Zrot += 2.0; */
- glutPostRedisplay();
-}
-
-
-static void
-DrawTextures(void)
-{
- GLuint i;
-
- for (i = 0; i < NumTextures; i++) {
- GLfloat ar = TexAspect[i];
-
- glPushMatrix();
- glTranslatef(TexPos[i][0], TexPos[i][1], TexPos[i][2]);
- glRotatef(TexRot[i][0], 1, 0, 0);
- glRotatef(TexRot[i][1], 0, 1, 0);
- glRotatef(TexRot[i][2], 0, 0, 1);
-
- glBindTexture(GL_TEXTURE_2D, Textures[i]);
- glBegin(GL_POLYGON);
-#if TEST_CLAMP
- glTexCoord2f( -0.5, -0.5 ); glVertex2f( -ar, -1.0 );
- glTexCoord2f( 1.5, -0.5 ); glVertex2f( ar, -1.0 );
- glTexCoord2f( 1.5, 1.5 ); glVertex2f( ar, 1.0 );
- glTexCoord2f( -0.5, 1.5 ); glVertex2f( -ar, 1.0 );
-#else
- glTexCoord2f( 0.0, 0.0 ); glVertex2f( -ar, -1.0 );
- glTexCoord2f( 1.0, 0.0 ); glVertex2f( ar, -1.0 );
- glTexCoord2f( 1.0, 1.0 ); glVertex2f( ar, 1.0 );
- glTexCoord2f( 0.0, 1.0 ); glVertex2f( -ar, 1.0 );
-#endif
- glEnd();
-
- glPopMatrix();
- }
-}
-
-static void
-Draw(void)
-{
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-
- if (Blend) {
- glEnable(GL_BLEND);
- glDisable(GL_DEPTH_TEST);
- }
- else {
- glDisable(GL_BLEND);
- glEnable(GL_DEPTH_TEST);
- }
-
- glPushMatrix();
- glRotatef(Xrot, 1, 0, 0);
- glRotatef(Yrot, 0, 1, 0);
- glRotatef(Zrot, 0, 0, 1);
-
- DrawTextures();
-
- glPopMatrix();
-
- glutSwapBuffers();
-}
-
-
-static void
-Reshape(int width, int height)
-{
- glViewport(0, 0, width, height);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 50.0);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
- glTranslatef(0.0, 0.0, -10.0);
-}
-
-
-static GLfloat
-RandFloat(float min, float max)
-{
- float x = (float) (rand() % 1000) * 0.001;
- x = x * (max - min) + min;
- return x;
-}
-
-
-static void
-Randomize(void)
-{
- GLfloat k = 1.0;
- GLuint i;
-
- srand(glutGet(GLUT_ELAPSED_TIME));
-
- for (i = 0; i < NumTextures; i++) {
- TexRot[i][0] = RandFloat(0.0, 360);
- TexRot[i][1] = RandFloat(0.0, 360);
- TexRot[i][2] = RandFloat(0.0, 360);
- TexPos[i][0] = RandFloat(-k, k);
- TexPos[i][1] = RandFloat(-k, k);
- TexPos[i][2] = RandFloat(-k, k);
- }
-}
-
-
-static void
-SetTexParams(void)
-{
- GLuint i;
- for (i = 0; i < NumTextures; i++) {
- glBindTexture(GL_TEXTURE_2D, Textures[i]);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
- FilterModes[Filter].min);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
- FilterModes[Filter].mag);
-
- if (Clamp) {
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
- }
- else {
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
- }
- }
-}
-
-
-static void
-Key(unsigned char key, int x, int y)
-{
- const GLfloat step = 3.0;
- (void) x;
- (void) y;
- switch (key) {
- case 'a':
- case ' ':
- Anim = !Anim;
- if (Anim)
- glutIdleFunc(Idle);
- else
- glutIdleFunc(NULL);
- break;
- case 'b':
- Blend = !Blend;
- break;
- case 'f':
- Filter = (Filter + 1) % NUM_FILTERS;
- SetTexParams();
- break;
- case 'r':
- Randomize();
- break;
-#if TEST_CLAMP
- case 'c':
- Clamp = !Clamp;
- SetTexParams();
- break;
-#endif
- case 'z':
- Zrot -= step;
- break;
- case 'Z':
- Zrot += step;
- break;
- case 27:
- glutDestroyWindow(Win);
- exit(0);
- break;
- }
-
- printf("Blend=%s Filter=%s\n",
- Blend ? "Y" : "n",
- FilterModes[Filter].name);
-
- glutPostRedisplay();
-}
-
-
-static void
-SpecialKey(int key, int x, int y)
-{
- const GLfloat step = 3.0;
- (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();
-}
-
-
-static void
-LoadTextures(GLuint n, const char *files[])
-{
- GLuint i;
-
- NumTextures = n < MAX_TEXTURES ? n : MAX_TEXTURES;
-
- glGenTextures(n, Textures);
-
- SetTexParams();
-
- for (i = 0; i < n; i++) {
- GLint w, h;
- glBindTexture(GL_TEXTURE_2D, Textures[i]);
-#if TEST_MIPMAPS
- {
- static const GLubyte color[9][4] = {
- {255, 0, 0},
- {0, 255, 0},
- {0, 0, 255},
- {0, 255, 255},
- {255, 0, 255},
- {255, 255, 0},
- {255, 128, 255},
- {128, 128, 128},
- {64, 64, 64}
- };
-
- GLubyte image[256*256*4];
- int i, level;
- w = h = 256;
- for (level = 0; level <= 8; level++) {
- for (i = 0; i < w * h; i++) {
- image[i*4+0] = color[level][0];
- image[i*4+1] = color[level][1];
- image[i*4+2] = color[level][2];
- image[i*4+3] = color[level][3];
- }
- printf("Load level %d: %d x %d\n", level, w>>level, h>>level);
- glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, w>>level, h>>level, 0,
- GL_RGBA, GL_UNSIGNED_BYTE, image);
- }
- }
-#elif TEST_GEN_COMPRESSED_MIPMAPS
- {
- GLenum intFormat = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
- int f;
- GLenum format;
- GLubyte *img = LoadRGBImage(files[i], &w, &h, &format);
- GLboolean write_compressed = GL_FALSE;
- GLboolean read_compressed = GL_FALSE;
-
- glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
- glTexImage2D(GL_TEXTURE_2D, 0, intFormat, w, h, 0,
- format, GL_UNSIGNED_BYTE, img);
- glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_FALSE);
- free(img);
-
- glGetTexLevelParameteriv(GL_TEXTURE_2D, i,
- GL_TEXTURE_INTERNAL_FORMAT, &f);
- printf("actual internal format 0x%x\n", f);
-
- if (write_compressed) {
- GLint i, sz, w, h;
- int num_levels = 8;
- for (i = 0; i < num_levels; i++) {
- char name[20], *buf;
- FILE *f;
- glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_WIDTH, &w);
- glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_HEIGHT, &h);
- glGetTexLevelParameteriv(GL_TEXTURE_2D, i,
- GL_TEXTURE_COMPRESSED_IMAGE_SIZE, &sz);
- printf("Writing level %d: %d x %d bytes: %d\n", i, w, h, sz);
- buf = malloc(sz);
- glGetCompressedTexImageARB(GL_TEXTURE_2D, i, buf);
- sprintf(name, "comp%d", i);
- f = fopen(name, "w");
- fwrite(buf, 1, sz, f);
- fclose(f);
- free(buf);
- }
- }
-
- if (read_compressed) {
- GLint i, sz, w, h;
- int num_levels = 8;
- for (i = 01; i < num_levels; i++) {
- char name[20], *buf;
- FILE *f;
- glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_WIDTH, &w);
- glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_HEIGHT, &h);
- glGetTexLevelParameteriv(GL_TEXTURE_2D, i,
- GL_TEXTURE_COMPRESSED_IMAGE_SIZE, &sz);
- buf = malloc(sz);
- sprintf(name, "comp%d", i);
- printf("Reading level %d: %d x %d bytes: %d from %s\n",
- i, w, h, sz, name);
- f = fopen(name, "r");
- fread(buf, 1, sz, f);
- fclose(f);
- glCompressedTexImage2DARB(GL_TEXTURE_2D, i, intFormat,
- w, h, 0, sz, buf);
- free(buf);
- }
- }
- }
-#else
- if (!LoadRGBMipmaps2(files[i], GL_TEXTURE_2D, GL_RGB, &w, &h)) {
- printf("Error: couldn't load %s\n", files[i]);
- exit(1);
- }
-#endif
- TexAspect[i] = (float) w / (float) h;
- printf("Loaded %s\n", files[i]);
- }
-}
-
-
-static void
-Init(int argc, const char *argv[])
-{
- if (argc == 1)
- LoadTextures(4, DefaultFiles);
- else
- LoadTextures(argc - 1, argv + 1);
-
- Randomize();
-
- glEnable(GL_TEXTURE_2D);
-
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- glColor4f(1, 1, 1, 0.5);
-
-#if 0
- /* setup lighting, etc */
- glEnable(GL_LIGHTING);
- glEnable(GL_LIGHT0);
-#endif
-}
-
-
-static void
-Usage(void)
-{
- printf("Usage:\n");
- printf(" textures [file.rgb] ...\n");
- printf("Keys:\n");
- printf(" a - toggle animation\n");
- printf(" b - toggle blending\n");
- printf(" f - change texture filter mode\n");
- printf(" r - randomize\n");
- printf(" ESC - exit\n");
-}
-
-
-int
-main(int argc, char *argv[])
-{
- glutInitWindowSize(700, 700);
- glutInit(&argc, argv);
- glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
- Win = glutCreateWindow(argv[0]);
- glewInit();
- glutReshapeFunc(Reshape);
- glutKeyboardFunc(Key);
- glutSpecialFunc(SpecialKey);
- glutDisplayFunc(Draw);
- if (Anim)
- glutIdleFunc(Idle);
- Init(argc, (const char **) argv);
- Usage();
- glutMainLoop();
- return 0;
-}
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