166 lines
3.6 KiB
C
166 lines
3.6 KiB
C
/*
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* Test texture compression.
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <GL/glew.h>
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#include <GL/glut.h>
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#include "texcomp_image.h"
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static int ImgWidth = 512;
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static int ImgHeight = 512;
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static GLenum CompFormat = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
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static GLfloat EyeDist = 5.0;
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static GLfloat Rot = 0.0;
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const GLenum Target = GL_TEXTURE_2D;
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static void
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CheckError(int line)
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{
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GLenum err = glGetError();
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if (err) {
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printf("GL Error %d at line %d\n", (int) err, line);
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}
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}
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static void
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LoadCompressedImage(void)
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{
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const GLenum filter = GL_LINEAR;
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glTexImage2D(Target, 0, CompFormat, ImgWidth, ImgHeight, 0,
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GL_RGB, GL_UNSIGNED_BYTE, NULL);
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/* bottom half */
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glCompressedTexSubImage2DARB(Target, 0,
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0, 0, /* pos */
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ImgWidth, ImgHeight / 2,
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CompFormat, ImgSize / 2, ImgData + ImgSize / 2);
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/* top half */
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glCompressedTexSubImage2DARB(Target, 0,
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0, ImgHeight / 2, /* pos */
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ImgWidth, ImgHeight / 2,
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CompFormat, ImgSize / 2, ImgData);
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glTexParameteri(Target, GL_TEXTURE_MIN_FILTER, filter);
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glTexParameteri(Target, GL_TEXTURE_MAG_FILTER, filter);
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}
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static void
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Init()
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{
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GLint numFormats, formats[100];
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GLint p;
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if (!glutExtensionSupported("GL_ARB_texture_compression")) {
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printf("Sorry, GL_ARB_texture_compression is required.\n");
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exit(1);
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}
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if (!glutExtensionSupported("GL_EXT_texture_compression_s3tc")) {
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printf("Sorry, GL_EXT_texture_compression_s3tc is required.\n");
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exit(1);
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}
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printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
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printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
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glGetIntegerv(GL_NUM_COMPRESSED_TEXTURE_FORMATS_ARB, &numFormats);
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glGetIntegerv(GL_COMPRESSED_TEXTURE_FORMATS_ARB, formats);
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printf("%d supported compression formats: ", numFormats);
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for (p = 0; p < numFormats; p++)
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printf("0x%x ", formats[p]);
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printf("\n");
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glEnable(GL_TEXTURE_2D);
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LoadCompressedImage();
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}
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static void
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Reshape( int width, int height )
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{
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glViewport( 0, 0, width, height );
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glMatrixMode( GL_PROJECTION );
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glLoadIdentity();
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glFrustum(-1, 1, -1, 1, 4, 100);
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glMatrixMode( GL_MODELVIEW );
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glLoadIdentity();
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}
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static void
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Key( unsigned char key, int x, int y )
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{
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(void) x;
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(void) y;
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switch (key) {
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case 'd':
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EyeDist -= 1.0;
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if (EyeDist < 4.0)
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EyeDist = 4.0;
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break;
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case 'D':
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EyeDist += 1.0;
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break;
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case 'z':
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Rot += 5.0;
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break;
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case 'Z':
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Rot -= 5.0;
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break;
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case 27:
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exit(0);
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break;
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}
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glutPostRedisplay();
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}
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static void
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Draw( void )
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{
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glClearColor(0.3, 0.3, .8, 0);
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glClear(GL_COLOR_BUFFER_BIT);
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CheckError(__LINE__);
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glPushMatrix();
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glTranslatef(0, 0, -(EyeDist+0.01));
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glRotatef(Rot, 0, 0, 1);
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glBegin(GL_POLYGON);
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glTexCoord2f(0, 0); glVertex2f(-1, -1);
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glTexCoord2f(1, 0); glVertex2f( 1, -1);
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glTexCoord2f(1, 1); glVertex2f( 1, 1);
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glTexCoord2f(0, 1); glVertex2f(-1, 1);
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glEnd();
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glPopMatrix();
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glutSwapBuffers();
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}
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int
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main( int argc, char *argv[] )
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{
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glutInit( &argc, argv );
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glutInitWindowSize( 600, 600 );
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glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE);
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glutCreateWindow(argv[0]);
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glewInit();
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glutReshapeFunc( Reshape );
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glutKeyboardFunc( Key );
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glutDisplayFunc( Draw );
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Init();
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glutMainLoop();
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return 0;
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}
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