diff options
Diffstat (limited to 'progs/demos')
| -rw-r--r-- | progs/demos/Makefile | 1 | ||||
| -rw-r--r-- | progs/demos/textures.c | 304 |
2 files changed, 305 insertions, 0 deletions
diff --git a/progs/demos/Makefile b/progs/demos/Makefile index 123d1e59e9..467dbc5cdf 100644 --- a/progs/demos/Makefile +++ b/progs/demos/Makefile @@ -66,6 +66,7 @@ PROGS = \ texdown \ texenv \ texobj \ + textures \ trispd \ tunnel \ tunnel2 \ diff --git a/progs/demos/textures.c b/progs/demos/textures.c new file mode 100644 index 0000000000..9f11604635 --- /dev/null +++ b/progs/demos/textures.c @@ -0,0 +1,304 @@ +/* + * Simple test of multiple textures + */ + + +#include <stdio.h> +#include <stdlib.h> +#include <math.h> +#include <GL/glut.h> +#include "readtex.h" + +#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 GLboolean MipMap = 1+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" +}; + + +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); + 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 ); + 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 +SetTexFilters(void) +{ + GLuint i; + for (i = 0; i < NumTextures; i++) { + glBindTexture(GL_TEXTURE_2D, Textures[i]); + if (MipMap) { + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, + GL_LINEAR_MIPMAP_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + } + else { + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + } + } +} + + +static void +Key(unsigned char key, int x, int y) +{ + const GLfloat step = 3.0; + (void) x; + (void) y; + switch (key) { + case 'a': + Anim = !Anim; + if (Anim) + glutIdleFunc(Idle); + else + glutIdleFunc(NULL); + break; + case 'b': + Blend = !Blend; + break; + case 'm': + MipMap = !MipMap; + SetTexFilters(); + break; + case 'r': + Randomize(); + case 'z': + Zrot -= step; + break; + case 'Z': + Zrot += step; + break; + case 27: + glutDestroyWindow(Win); + exit(0); + break; + } + + printf("Blend=%s MipMap=%s\n", + Blend ? "Y" : "n", + MipMap ? "Y" : "n"); + + 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); + + for (i = 0; i < n; i++) { + GLint w, h; + glBindTexture(GL_TEXTURE_2D, Textures[i]); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + if (!LoadRGBMipmaps2(files[i], GL_TEXTURE_2D, GL_RGB, &w, &h)) { + printf("Error: couldn't load %s\n", files[i]); + exit(1); + } + 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(" m - toggle mipmapping\n"); + printf(" r - randomize\n"); + printf(" ESC - exit\n"); +} + + +int +main(int argc, char *argv[]) +{ + glutInit(&argc, argv); + glutInitWindowPosition(0, 0); + glutInitWindowSize(400, 400); + glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); + Win = glutCreateWindow(argv[0]); + glutReshapeFunc(Reshape); + glutKeyboardFunc(Key); + glutSpecialFunc(SpecialKey); + glutDisplayFunc(Draw); + if (Anim) + glutIdleFunc(Idle); + Init(argc, (const char **) argv); + Usage(); + glutMainLoop(); + return 0; +} |