141 lines
3.1 KiB
C
141 lines
3.1 KiB
C
/*
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* 'Texture leak' test
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*
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* Allocates and uses an additional texture of the maximum supported size for
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* each frame. This tests the system's ability to cope with using increasing
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* amounts of texture memory.
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*
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* Michel Dänzer July 2009 This program is in the public domain.
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*/
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <GL/glew.h>
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#include <GL/glut.h>
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GLint size;
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GLvoid *image;
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static GLuint numTexObj;
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static GLuint *texObj;
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static void Idle( void )
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{
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glutPostRedisplay();
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}
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static void DrawObject(void)
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{
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static const GLfloat tex_coords[] = { 0.0, 0.0, 1.0, 1.0, 0.0 };
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static const GLfloat vtx_coords[] = { -1.0, -1.0, 1.0, 1.0, -1.0 };
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GLint i, j;
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glEnable(GL_TEXTURE_2D);
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for (i = 0; i < numTexObj; i++) {
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glBindTexture(GL_TEXTURE_2D, texObj[i]);
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glBegin(GL_QUADS);
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for (j = 0; j < 4; j++ ) {
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glTexCoord2f(tex_coords[j], tex_coords[j+1]);
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glVertex2f( vtx_coords[j], vtx_coords[j+1] );
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}
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glEnd();
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}
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}
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static void Display( void )
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{
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struct timeval start, end;
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texObj = realloc(texObj, ++numTexObj * sizeof(*texObj));
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/* allocate a texture object */
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glGenTextures(1, texObj + (numTexObj - 1));
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glBindTexture(GL_TEXTURE_2D, texObj[numTexObj - 1]);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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memset(image, (16 * numTexObj) & 0xff, 4 * size * size);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, size, size, 0,
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GL_RGBA, GL_UNSIGNED_BYTE, image);
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gettimeofday(&start, NULL);
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glClear( GL_COLOR_BUFFER_BIT );
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glPushMatrix();
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glScalef(5.0, 5.0, 5.0);
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DrawObject();
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glPopMatrix();
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glutSwapBuffers();
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glFinish();
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gettimeofday(&end, NULL);
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printf("Rendering frame took %lu ms using %u MB of textures\n",
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end.tv_sec * 1000 + end.tv_usec / 1000 - start.tv_sec * 1000 -
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start.tv_usec / 1000, numTexObj * 4 * size / 1024 * size / 1024);
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sleep(1);
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}
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static void 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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glOrtho( -6.0, 6.0, -6.0, 6.0, 10.0, 100.0 );
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glMatrixMode( GL_MODELVIEW );
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glLoadIdentity();
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glTranslatef( 0.0, 0.0, -70.0 );
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}
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static void Init( int argc, char *argv[] )
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{
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glGetIntegerv(GL_MAX_TEXTURE_SIZE, &size);
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printf("%d x %d max texture size\n", size, size);
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image = malloc(4 * size * size);
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if (!image) {
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fprintf(stderr, "Failed to allocate %u bytes of memory\n", 4 * size * size);
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exit(1);
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}
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glShadeModel(GL_FLAT);
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glClearColor(0.3, 0.3, 0.4, 1.0);
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Idle();
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}
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int main( int argc, char *argv[] )
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{
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glutInit( &argc, argv );
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glutInitWindowSize( 300, 300 );
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glutInitWindowPosition( 0, 0 );
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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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Init( argc, argv );
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glutReshapeFunc( Reshape );
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glutDisplayFunc( Display );
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glutIdleFunc(Idle);
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glutMainLoop();
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return 0;
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}
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