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* Copyright (C) 2000 Brian Paul All Rights Reserved.
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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* Simple regression test for bug #3195. A bug in the i180 driver caused
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* a segfault (inside the driver) when the LOD bias is adjusted and no texture
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* is enabled. This test, which is based on progs/demos/lodbias.c, sets up
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* all the texturing, disables all textures, adjusts the LOD bias, then
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* re-enables \c GL_TEXTURE_2D.
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* \author Ian Romanick <idr@us.ibm.com>
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#define TEXTURE_FILE "../images/girl.rgb"
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static GLfloat Xrot = 0, Yrot = -30, Zrot = 0;
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static GLint Bias = 0, BiasStepSign = +1; /* ints avoid fp precision problem */
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static GLint BiasMin = -400, BiasMax = 400;
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PrintString(const char *s)
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glutBitmapCharacter(GLUT_BITMAP_8_BY_13, (int) *s);
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static void Idle( void )
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static int lastTime = 0;
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int time = glutGet(GLUT_ELAPSED_TIME);
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else if (time - lastTime < 10)
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step = (time - lastTime) / 10 * BiasStepSign;
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else if (Bias > BiasMax) {
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static void Display( void )
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glClear( GL_COLOR_BUFFER_BIT );
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glMatrixMode( GL_PROJECTION );
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glOrtho(-1, 1, -1, 1, -1, 1);
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glMatrixMode( GL_MODELVIEW );
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glDisable(GL_TEXTURE_2D);
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glRasterPos3f(-0.9, -0.9, 0.0);
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sprintf(str, "Texture LOD Bias = %4.1f", Bias * 0.01);
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glMatrixMode( GL_PROJECTION );
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glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
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glMatrixMode( GL_MODELVIEW );
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glTranslatef( 0.0, 0.0, -8.0 );
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glRotatef(Xrot, 1, 0, 0);
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glRotatef(Yrot, 0, 1, 0);
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glRotatef(Zrot, 0, 0, 1);
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glTexEnvf(GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, 0.01 * Bias);
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glEnable(GL_TEXTURE_2D);
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glTexCoord2f(0, 0); glVertex2f(-1, -1);
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glTexCoord2f(2, 0); glVertex2f( 1, -1);
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glTexCoord2f(2, 2); glVertex2f( 1, 1);
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glTexCoord2f(0, 2); glVertex2f(-1, 1);
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static void Reshape( int width, int height )
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glViewport( 0, 0, width, height );
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static void Key( unsigned char key, int x, int y )
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static void SpecialKey( int key, int x, int y )
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const GLfloat step = 3.0;
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static void Init( void )
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const char * const ver_string = (const char *)
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glGetString( GL_VERSION );
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printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
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printf("GL_VERSION = %s\n", ver_string);
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printf("\nThis program should function nearly identically to Mesa's lodbias demo.\n"
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"It should cycle through the complet LOD bias range once and exit. If bug\n"
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"#3195 still exists, the demo should crash almost immediatly.\n");
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printf("This is a regression test for bug #3195.\n");
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printf("https://bugs.freedesktop.org/show_bug.cgi?id=3195\n");
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if (!glutExtensionSupported("GL_EXT_texture_lod_bias")) {
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printf("Sorry, GL_EXT_texture_lod_bias not supported by this renderer.\n");
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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if (glutExtensionSupported("GL_SGIS_generate_mipmap")) {
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/* test auto mipmap generation */
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GLint width, height, i;
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GLubyte *image = LoadRGBImage(TEXTURE_FILE, &width, &height, &format);
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printf("Error: could not load texture image %s\n", TEXTURE_FILE);
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/* resize to 256 x 256 */
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if (width != 256 || height != 256) {
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GLubyte *newImage = malloc(256 * 256 * 4);
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gluScaleImage(format, width, height, GL_UNSIGNED_BYTE, image,
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256, 256, GL_UNSIGNED_BYTE, newImage);
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printf("Using GL_SGIS_generate_mipmap\n");
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glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
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glTexImage2D(GL_TEXTURE_2D, 0, format, 256, 256, 0,
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format, GL_UNSIGNED_BYTE, image);
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/* make sure mipmap was really generated correctly */
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width = height = 256;
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for (i = 0; i < 9; i++) {
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glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_WIDTH, &w);
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glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_HEIGHT, &h);
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printf("Level %d size: %d x %d\n", i, w, h);
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else if (!LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) {
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printf("Error: could not load texture image %s\n", TEXTURE_FILE);
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/* mipmapping required for this extension */
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
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glGetFloatv(GL_MAX_TEXTURE_LOD_BIAS_EXT, &maxBias);
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printf("LOD bias range: [%g, %g]\n", -maxBias, maxBias);
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BiasMin = -100 * maxBias;
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BiasMax = 100 * maxBias;
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/* Since we have (about) 8 mipmap levels, no need to bias beyond
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* the range [-1, +8].
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int main( int argc, char *argv[] )
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glutInit( &argc, argv );
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glutInitWindowPosition( 0, 0 );
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glutInitWindowSize( 350, 350 );
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glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
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glutCreateWindow( "Bug #3195 Test" );
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glutReshapeFunc( Reshape );
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glutKeyboardFunc( Key );
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glutSpecialFunc( SpecialKey );
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glutDisplayFunc( Display );
added
removed
src/tests/bug_3195.c
