--- /dev/null
+/*
+ * Copyright (C) 2000 Brian Paul All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * \file bug_3195.c
+ *
+ * Simple regression test for bug #3195. A bug in the i180 driver caused
+ * a segfault (inside the driver) when the LOD bias is adjusted and no texture
+ * is enabled. This test, which is based on progs/demos/lodbias.c, sets up
+ * all the texturing, disables all textures, adjusts the LOD bias, then
+ * re-enables \c GL_TEXTURE_2D.
+ *
+ * \author Brian Paul
+ * \author Ian Romanick <idr@us.ibm.com>
+ */
+
+#include <assert.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include <GL/glut.h>
+#include <GL/glext.h>
+
+#include "readtex.h"
+
+#define TEXTURE_FILE "../images/girl.rgb"
+
+static GLfloat Xrot = 0, Yrot = -30, Zrot = 0;
+static GLint Bias = 0, BiasStepSign = +1; /* ints avoid fp precision problem */
+static GLint BiasMin = -400, BiasMax = 400;
+
+
+
+static void
+PrintString(const char *s)
+{
+ while (*s) {
+ glutBitmapCharacter(GLUT_BITMAP_8_BY_13, (int) *s);
+ s++;
+ }
+}
+
+static void Idle( void )
+{
+ static int lastTime = 0;
+ int time = glutGet(GLUT_ELAPSED_TIME);
+ int step;
+
+ if (lastTime == 0)
+ lastTime = time;
+ else if (time - lastTime < 10)
+ return;
+
+ step = (time - lastTime) / 10 * BiasStepSign;
+ lastTime = time;
+
+ Bias += step;
+ if (Bias < BiasMin) {
+ exit(0);
+ }
+ else if (Bias > BiasMax) {
+ Bias = BiasMax;
+ BiasStepSign = -1;
+ }
+
+ glutPostRedisplay();
+}
+
+
+static void Display( void )
+{
+ char str[100];
+
+ glClear( GL_COLOR_BUFFER_BIT );
+
+ glMatrixMode( GL_PROJECTION );
+ glLoadIdentity();
+ glOrtho(-1, 1, -1, 1, -1, 1);
+ glMatrixMode( GL_MODELVIEW );
+ glLoadIdentity();
+
+ glDisable(GL_TEXTURE_2D);
+ glColor3f(1,1,1);
+ glRasterPos3f(-0.9, -0.9, 0.0);
+ sprintf(str, "Texture LOD Bias = %4.1f", Bias * 0.01);
+ PrintString(str);
+
+ glMatrixMode( GL_PROJECTION );
+ glLoadIdentity();
+ glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
+ glMatrixMode( GL_MODELVIEW );
+ glLoadIdentity();
+ glTranslatef( 0.0, 0.0, -8.0 );
+
+ glPushMatrix();
+ glRotatef(Xrot, 1, 0, 0);
+ glRotatef(Yrot, 0, 1, 0);
+ glRotatef(Zrot, 0, 0, 1);
+
+ glTexEnvf(GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, 0.01 * Bias);
+ glEnable(GL_TEXTURE_2D);
+
+ glBegin(GL_POLYGON);
+ glTexCoord2f(0, 0); glVertex2f(-1, -1);
+ glTexCoord2f(2, 0); glVertex2f( 1, -1);
+ glTexCoord2f(2, 2); glVertex2f( 1, 1);
+ glTexCoord2f(0, 2); glVertex2f(-1, 1);
+ glEnd();
+
+ glPopMatrix();
+
+ glutSwapBuffers();
+}
+
+
+static void Reshape( int width, int height )
+{
+ glViewport( 0, 0, width, height );
+}
+
+
+static void Key( unsigned char key, int x, int y )
+{
+ (void) x;
+ (void) y;
+ switch (key) {
+ case 27:
+ exit(0);
+ break;
+ }
+ 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 Init( void )
+{
+ GLfloat maxBias;
+ const char * const ver_string = (const char * const)
+ glGetString( GL_VERSION );
+
+ printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
+ printf("GL_VERSION = %s\n", ver_string);
+
+ printf("\nThis program should function nearly identically to Mesa's lodbias demo.\n"
+ "It should cycle through the complet LOD bias range once and exit. If bug\n"
+ "#3195 still exists, the demo should crash almost immediatly.\n");
+ printf("This is a regression test for bug #3101.\n");
+ printf("https://bugs.freedesktop.org/show_bug.cgi?id=3101\n");
+
+ if (!glutExtensionSupported("GL_EXT_texture_lod_bias")) {
+ printf("Sorry, GL_EXT_texture_lod_bias not supported by this renderer.\n");
+ exit(1);
+ }
+
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+ if (glutExtensionSupported("GL_SGIS_generate_mipmap")) {
+ /* test auto mipmap generation */
+ GLint width, height, i;
+ GLenum format;
+ GLubyte *image = LoadRGBImage(TEXTURE_FILE, &width, &height, &format);
+ if (!image) {
+ printf("Error: could not load texture image %s\n", TEXTURE_FILE);
+ exit(1);
+ }
+ /* resize to 256 x 256 */
+ if (width != 256 || height != 256) {
+ GLubyte *newImage = malloc(256 * 256 * 4);
+ gluScaleImage(format, width, height, GL_UNSIGNED_BYTE, image,
+ 256, 256, GL_UNSIGNED_BYTE, newImage);
+ free(image);
+ image = newImage;
+ }
+ printf("Using GL_SGIS_generate_mipmap\n");
+ glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
+ glTexImage2D(GL_TEXTURE_2D, 0, format, 256, 256, 0,
+ format, GL_UNSIGNED_BYTE, image);
+ free(image);
+
+ /* make sure mipmap was really generated correctly */
+ width = height = 256;
+ for (i = 0; i < 9; i++) {
+ GLint w, h;
+ glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_WIDTH, &w);
+ glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_HEIGHT, &h);
+ printf("Level %d size: %d x %d\n", i, w, h);
+ assert(w == width);
+ assert(h == height);
+ width /= 2;
+ height /= 2;
+ }
+
+ }
+ else if (!LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) {
+ printf("Error: could not load texture image %s\n", TEXTURE_FILE);
+ exit(1);
+ }
+
+ /* mipmapping required for this extension */
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+
+ glGetFloatv(GL_MAX_TEXTURE_LOD_BIAS_EXT, &maxBias);
+ printf("LOD bias range: [%g, %g]\n", -maxBias, maxBias);
+ BiasMin = -100 * maxBias;
+ BiasMax = 100 * maxBias;
+
+ /* Since we have (about) 8 mipmap levels, no need to bias beyond
+ * the range [-1, +8].
+ */
+ if (BiasMin < -100)
+ BiasMin = -100;
+ if (BiasMax > 800)
+ BiasMax = 800;
+}
+
+
+int main( int argc, char *argv[] )
+{
+ glutInit( &argc, argv );
+ glutInitWindowPosition( 0, 0 );
+ glutInitWindowSize( 350, 350 );
+ glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
+ glutCreateWindow( "Bug #3195 Test" );
+ glutReshapeFunc( Reshape );
+ glutKeyboardFunc( Key );
+ glutSpecialFunc( SpecialKey );
+ glutDisplayFunc( Display );
+ glutIdleFunc(Idle);
+ Init();
+ glutMainLoop();
+ return 0;
+}
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