#include <GL/glew.h>
#include <GL/glut.h>
-static GLint BaseLevel = 0, MaxLevel = 8;
+#include "readtex.h"
+
+#define TEXTURE_FILE "../images/girl.rgb"
+
+static GLint BaseLevel = 0, MaxLevel = 9;
static GLfloat MinLod = -1, MaxLod = 9;
static GLfloat LodBias = 0.0;
static GLboolean NearestFilter = GL_TRUE;
+static GLuint texImage, texColor, texCurrent;
static void
InitValues(void)
{
BaseLevel = 0;
- MaxLevel = 8;
+ MaxLevel = 9;
MinLod = -1;
MaxLod = 9;
LodBias = 0.0;
static void MakeImage(int level, int width, int height, const GLubyte color[4])
{
const int makeStripes = 0;
- GLubyte img[256*256*3];
+ GLubyte img[512*512*3];
int i, j;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
}
-static void makeImages(void)
+static void makeImages(int image)
{
- static const GLubyte colors[8][3] = {
- {128, 128, 128 },
- { 0, 255, 255 },
- { 255, 255, 0 },
- { 255, 0, 255 },
- { 255, 0, 0 },
- { 0, 255, 0 },
- { 0, 0, 255 },
- { 255, 255, 255 }
- };
- int i, sz = 128;
-
- for (i = 0; i < 8; i++) {
- MakeImage(i, sz, sz, colors[i]);
- sz /= 2;
+#define WIDTH 512
+#define HEIGHT 512
+ if (glutExtensionSupported("GL_SGIS_generate_mipmap") && image) {
+ /* 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 */
+ if (width != WIDTH || height != HEIGHT) {
+ GLubyte *newImage = malloc(WIDTH * HEIGHT * 4);
+ gluScaleImage(format, width, height, GL_UNSIGNED_BYTE, image,
+ WIDTH, HEIGHT, 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, WIDTH, HEIGHT, 0,
+ format, GL_UNSIGNED_BYTE, image);
+ glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_FALSE);
+ free(image);
+
+ /* make sure mipmap was really generated correctly */
+ width = WIDTH; height = HEIGHT;
+ for (i = 0; i < 10; 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);
+ width /= 2;
+ height /= 2;
+ }
+ } else {
+ static const GLubyte colors[10][3] = {
+ {128, 128, 128 },
+ { 0, 255, 255 },
+ { 255, 255, 0 },
+ { 255, 0, 255 },
+ { 255, 0, 0 },
+ { 0, 255, 0 },
+ { 0, 0, 255 },
+ { 0, 255, 255 },
+ { 255, 255, 0 },
+ { 255, 255, 255 }
+ };
+ int i, sz = 512;
+
+ for (i = 0; i < 10; i++) {
+ MakeImage(i, sz, sz, colors[i]);
+ printf("Level %d size: %d x %d\n", i, sz, sz);
+ sz /= 2;
+ }
}
}
static void myinit(void)
{
- InitValues();
+ InitValues();
+
+ glEnable(GL_DEPTH_TEST);
+ glDepthFunc(GL_LESS);
+ glShadeModel(GL_FLAT);
- glEnable(GL_DEPTH_TEST);
- glDepthFunc(GL_LESS);
- glShadeModel(GL_FLAT);
+ glTranslatef(0.0, 0.0, -3.6);
- glTranslatef(0.0, 0.0, -3.6);
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+ glGenTextures(1, &texImage);
+ glBindTexture(GL_TEXTURE_2D, texImage);
+ makeImages(1);
+ glGenTextures(1, &texColor);
+ glBindTexture(GL_TEXTURE_2D, texColor);
+ makeImages(0);
- glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
- makeImages();
- glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
- glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
- glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
- glEnable(GL_TEXTURE_2D);
+ texCurrent = texImage;
+
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+ glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
+ glEnable(GL_TEXTURE_2D);
}
static void display(void)
{
- GLfloat tcm = 4.0;
- printf("BASE_LEVEL=%d MAX_LEVEL=%d MIN_LOD=%.2g MAX_LOD=%.2g Bias=%.2g Filter=%s\n",
- BaseLevel, MaxLevel, MinLod, MaxLod, LodBias,
- NearestFilter ? "NEAREST" : "LINEAR");
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, BaseLevel);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, MaxLevel);
-
- glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_LOD, MinLod);
- glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_LOD, MaxLod);
-
- if (NearestFilter) {
- glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
- glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
- GL_NEAREST_MIPMAP_NEAREST);
- }
- else {
- glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
- glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
- GL_LINEAR_MIPMAP_LINEAR);
- }
-
- glTexEnvf(GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, LodBias);
-
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
- glBegin(GL_QUADS);
- glTexCoord2f(0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0);
- glTexCoord2f(0.0, tcm); glVertex3f(-2.0, 1.0, 0.0);
- glTexCoord2f(tcm, tcm); glVertex3f(3000.0, 1.0, -6000.0);
- glTexCoord2f(tcm, 0.0); glVertex3f(3000.0, -1.0, -6000.0);
- glEnd();
- glFlush();
+ GLfloat tcm = 1.0;
+ glBindTexture(GL_TEXTURE_2D, texCurrent);
+
+ printf("BASE_LEVEL=%d MAX_LEVEL=%d MIN_LOD=%.2g MAX_LOD=%.2g Bias=%.2g Filter=%s\n",
+ BaseLevel, MaxLevel, MinLod, MaxLod, LodBias,
+ NearestFilter ? "NEAREST" : "LINEAR");
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, BaseLevel);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, MaxLevel);
+
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_LOD, MinLod);
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_LOD, MaxLod);
+
+ if (NearestFilter) {
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
+ GL_NEAREST_MIPMAP_NEAREST);
+ }
+ else {
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
+ GL_LINEAR_MIPMAP_LINEAR);
+ }
+
+ glTexEnvf(GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, LodBias);
+
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+ glBegin(GL_QUADS);
+ glTexCoord2f(0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0);
+ glTexCoord2f(0.0, tcm); glVertex3f(-2.0, 1.0, 0.0);
+ glTexCoord2f(tcm * 3000.0, tcm); glVertex3f(3000.0, 1.0, -6000.0);
+ glTexCoord2f(tcm * 3000.0, 0.0); glVertex3f(3000.0, -1.0, -6000.0);
+ glEnd();
+ glFlush();
}
static void myReshape(int w, int h)
{
- glViewport(0, 0, w, h);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- gluPerspective(60.0, 1.0*(GLfloat)w/(GLfloat)h, 1.0, 30000.0);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
+ glViewport(0, 0, w, h);
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ gluPerspective(60.0, 1.0*(GLfloat)w/(GLfloat)h, 1.0, 30000.0);
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
}
static void
case 'f':
NearestFilter = !NearestFilter;
break;
+ case 't':
+ if (texCurrent == texColor)
+ texCurrent = texImage;
+ else
+ texCurrent = texColor;
+ break;
case ' ':
InitValues();
break;
printf(" x/X decrease/increase GL_TEXTURE_MAX_LOD\n");
printf(" l/L decrease/increase GL_TEXTURE_LOD_BIAS\n");
printf(" f toggle nearest/linear filtering\n");
+ printf(" t toggle texture color/image\n");
printf(" SPACE reset values\n");
}
projects / mesa.git / commitdiff