mesa: simple multiple textures test

diff --git a/progs/demos/Makefile b/progs/demos/Makefile
index 123d1e59e976f8aebd1a94d8418473805b0a92ed..467dbc5cdf9d9cd6fac0692470ec043880f5099b 100644 (file)
--- 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 (file)
index 0000000..9f11604
--- /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;
+}