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  1. PO
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    <p>I think the following code snippet is what you're talking about. However, without the hack in <code>reshape()</code> it shimmers pretty badly with <code>GL_NEAREST</code> and non-even viewport sizes. Any insight would be appreciated. </p> <p>It uses texture coordinate generation though, so I'm not sure what to tell you on the OpenGL ES 1.1 front. A PowerVR rep <a href="http://www.khronos.org/message_boards/viewtopic.php?f=4&amp;t=1219" rel="nofollow noreferrer" title="OpenGL ES 1.1 texture coordinate generation hint">hinted</a> at a solution, but wasn't very explicit.</p> <pre><code>#include &lt;GL/glut.h&gt; #include &lt;cstdlib&gt; #include &lt;cmath&gt; static GLuint texName; void init(void) { glClearColor(0,0,0,0); // create random texture const int texWidth = 8; const int texHeight = 8; GLubyte tex[texHeight][texWidth][4]; for(int i = 0; i &lt; texHeight; i++) { for(int j = 0; j &lt; texWidth; j++) { tex[i][j][0] = (GLubyte) rand()%255; tex[i][j][1] = (GLubyte) rand()%255; tex[i][j][2] = (GLubyte) rand()%255; tex[i][j][3] = (GLubyte) 255; } } glPixelStorei(GL_UNPACK_ALIGNMENT, 1); glGenTextures(1, &amp;texName); glBindTexture(GL_TEXTURE_2D, texName); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texWidth, texHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, tex); // planes for texture coordinate generation GLfloat xp[] = {1,0,0,0}; GLfloat yp[] = {0,1,0,0}; GLfloat zp[] = {0,0,1,0}; GLfloat wp[] = {0,0,0,1}; glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR); glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR); glTexGeni(GL_R, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR); glTexGeni(GL_Q, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR); glTexGenfv(GL_S, GL_EYE_PLANE, xp); glTexGenfv(GL_T, GL_EYE_PLANE, yp); glTexGenfv(GL_R, GL_EYE_PLANE, zp); glTexGenfv(GL_Q, GL_EYE_PLANE, wp); glEnable(GL_TEXTURE_GEN_S); glEnable(GL_TEXTURE_GEN_T); glEnable(GL_TEXTURE_GEN_R); glEnable(GL_TEXTURE_GEN_Q); glEnable(GL_DEPTH_TEST); glShadeModel(GL_SMOOTH); glEnable(GL_TEXTURE_2D); glEnable(GL_CULL_FACE); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); } void display(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // projection glMatrixMode(GL_PROJECTION); glLoadIdentity(); int viewport[4]; glGetIntegerv(GL_VIEWPORT, viewport); gluPerspective(60.0, (GLdouble)viewport[2]/(GLdouble)viewport[3], 1.0, 100.0 ); // texture matrix trickery int tw,th; glMatrixMode(GL_TEXTURE); glLoadIdentity(); glBindTexture(GL_TEXTURE_2D, texName); glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &amp;tw); glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &amp;th); glScaled( (viewport[2]/2)/(GLdouble)tw, (viewport[3]/2)/(GLdouble)th, 0 ); GLdouble proj[16]; glGetDoublev(GL_PROJECTION_MATRIX, proj); // grab projection matrix glMultMatrixd(proj); // view transform glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef(0,0,-2.5); // render textured teapot glPushMatrix(); const float ANGLE_SPEED = 60; // degrees/sec float angle = ANGLE_SPEED * (glutGet(GLUT_ELAPSED_TIME) / 1000.0f); glRotatef(angle*0.5f, 1, 0, 0); glRotatef(angle, 0, 1, 0); glRotatef(angle*0.7f, 0, 0, 1); glScalef(-1,-1,-1); // teapot is wound backwards (GL_CW), so flip it glutSolidTeapot(1); glPopMatrix(); glutSwapBuffers(); } void reshape(int w, int h) { // make width/height evenly divisible by 2 w -= (w%2); h -= (h%2); glViewport(0, 0, (GLsizei) w, (GLsizei) h); } void keyboard (unsigned char key, int x, int y) { switch (key) { case 27: exit(0); break; default: break; } } void idle() { glutPostRedisplay(); } int main(int argc, char** argv) { glutInit(&amp;argc, argv); glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH); glutInitWindowSize(640, 480); glutInitWindowPosition(100, 100); glutCreateWindow (argv[0]); glutDisplayFunc(display); glutReshapeFunc(reshape); glutKeyboardFunc(keyboard); glutIdleFunc(idle); init(); glutMainLoop(); return 0; } </code></pre> <p>EDIT: Got the texture matrix only method figured out (should be OpenGL ES 1.1-able):</p> <pre><code>#include &lt;GL/glut.h&gt; #include &lt;cstdlib&gt; #include &lt;cmath&gt; void glutTexturedCube(GLdouble size) { GLfloat texc[] = { 1,1, 0,1, 0,0, 1,0, 0,1, 0,0, 1,0, 1,1, 1,0, 1,1, 0,1, 0,0, 1,1, 0,1, 0,0, 1,0, 0,0, 1,0, 1,1, 0,1, 0,0, 1,0, 1,1, 0,1, }; GLfloat norm[] = { 0,0,1, 0,0,1, 0,0,1, 0,0,1, 1,0,0, 1,0,0, 1,0,0, 1,0,0, 0,1,0, 0,1,0, 0,1,0, 0,1,0, -1,0,0, -1,0,0, -1,0,0, -1,0,0, 0,-1,0, 0,-1,0, 0,-1,0, 0,-1,0, 0,0,-1, 0,0,-1, 0,0,-1, 0,0,-1, }; GLfloat vert[] = { 1,1,1, -1,1,1, -1,-1,1, 1,-1,1, 1,1,1, 1,-1,1, 1,-1,-1, 1,1,-1, 1,1,1, 1,1,-1, -1,1,-1, -1,1,1, -1,1,1, -1,1,-1, -1,-1,-1, -1,-1,1, -1,-1,-1, 1,-1,-1, 1,-1,1, -1,-1,1, 1,-1,-1, -1,-1,-1, -1,1,-1, 1,1,-1, }; GLuint idxs[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, }; glEnableClientState(GL_TEXTURE_COORD_ARRAY); glEnableClientState(GL_NORMAL_ARRAY); glEnableClientState(GL_VERTEX_ARRAY); // feed vertices in as texture coordinates glTexCoordPointer(3, GL_FLOAT, 0, vert); glNormalPointer(GL_FLOAT, 0, norm); glVertexPointer(3, GL_FLOAT, 0, vert); glPushMatrix(); glColor4f(1, 1, 1, 1); glScaled(size, size, size); glDrawElements(GL_QUADS, sizeof(idxs)/sizeof(idxs[0]), GL_UNSIGNED_INT, idxs); glPopMatrix(); glDisableClientState(GL_TEXTURE_COORD_ARRAY); glDisableClientState(GL_NORMAL_ARRAY); glDisableClientState(GL_VERTEX_ARRAY); } static GLuint texName; void init(void) { glClearColor(0,0,0,0); // create random texture const int texWidth = 8; const int texHeight = 8; GLubyte tex[texHeight][texWidth][4]; for(int i = 0; i &lt; texHeight; i++) { for(int j = 0; j &lt; texWidth; j++) { tex[i][j][0] = (GLubyte) rand()%255; tex[i][j][1] = (GLubyte) rand()%255; tex[i][j][2] = (GLubyte) rand()%255; tex[i][j][3] = (GLubyte) 255; } } glPixelStorei(GL_UNPACK_ALIGNMENT, 1); glGenTextures(1, &amp;texName); glBindTexture(GL_TEXTURE_2D, texName); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texWidth, texHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, tex); glEnable(GL_DEPTH_TEST); glShadeModel(GL_SMOOTH); glEnable(GL_TEXTURE_2D); glEnable(GL_CULL_FACE); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); } void display(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // projection glMatrixMode(GL_PROJECTION); glLoadIdentity(); int viewport[4]; glGetIntegerv(GL_VIEWPORT, viewport); gluPerspective(60.0, (GLdouble)viewport[2]/(GLdouble)viewport[3], 1.0, 100.0 ); // view transform glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef(0,0,-3); // render textured teapot glPushMatrix(); const float ANGLE_SPEED = 10; // degrees/sec float angle = ANGLE_SPEED * (glutGet(GLUT_ELAPSED_TIME) / 1000.0f); glRotatef(angle*0.5f, 1, 0, 0); glRotatef(angle, 0, 1, 0); glRotatef(angle*0.7f, 0, 0, 1); // texture matrix trickery int tw,th; glBindTexture(GL_TEXTURE_2D, texName); glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &amp;tw); glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &amp;th); GLint mmode = 0; glGetIntegerv(GL_MATRIX_MODE, &amp;mmode); glMatrixMode(GL_TEXTURE); glLoadIdentity(); glScaled( (viewport[2]/2)/(GLdouble)tw, (viewport[3]/2)/(GLdouble)th, 0 ); GLdouble mat[16]; glGetDoublev(GL_PROJECTION_MATRIX, mat); glMultMatrixd(mat); glGetDoublev(GL_MODELVIEW_MATRIX, mat); glMultMatrixd(mat); glMatrixMode(mmode); glutTexturedCube(1); glPopMatrix(); glutSwapBuffers(); } void reshape(int w, int h) { // make width/height evenly divisible by 2 w -= (w%2); h -= (h%2); glViewport(0, 0, (GLsizei) w, (GLsizei) h); } void keyboard (unsigned char key, int x, int y) { switch (key) { case 27: exit(0); break; default: break; } } void idle() { glutPostRedisplay(); } int main(int argc, char** argv) { glutInit(&amp;argc, argv); glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH); glutInitWindowSize(640, 480); glutInitWindowPosition(100, 100); glutCreateWindow (argv[0]); glutDisplayFunc(display); glutReshapeFunc(reshape); glutKeyboardFunc(keyboard); glutIdleFunc(idle); init(); glutMainLoop(); return 0; } </code></pre>
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    1. POopengl: how to avoid texture scaling
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    1. USgenpfault
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    1. COwow, that's a big snippet, thanks. What does it do exactly? I can't test it right now because the glut library is not on the iphone SDK.
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      1. USSteph Thirion
    2. COThe first just draws a glutTeapot with glTexGen() and friends, the second a cube using only the texture matrix. The core logic should be glut-independent. I built them using FreeGLUT on Windows XP, but if you get GLUT/FreeGLUT going on OSX they should work fine.
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