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simplify image setup code, added LOD Bias control (l/L keys)

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This commit is contained in:
Brian Paul
2006-05-11 01:15:48 +00:00
parent aecd02b391
commit fa489dd043
1 changed files with 61 additions and 75 deletions
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progs/tests/mipmap_limits.c
+61 -75
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@@ -53,66 +53,56 @@
#include <stdio.h>
#include <GL/glut.h>
GLubyte mipmapImage64[64][64][3];
GLubyte mipmapImage32[32][32][3];
GLubyte mipmapImage16[16][16][3];
GLubyte mipmapImage8[8][8][3];
GLubyte mipmapImage4[4][4][3];
GLubyte mipmapImage2[2][2][3];
GLubyte mipmapImage1[1][1][3];
static GLint BaseLevel = 0, MaxLevel = 8;
static GLfloat LodBias = 0.0;
static GLboolean NearestFilter = GL_TRUE;
static void MakeImage(int level, int width, int height, const GLubyte color[4])
{
const int makeStripes = 0;
GLubyte img[256*256*3];
int i, j;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
int k = (i * width + j) * 3;
int p = (i/8) & makeStripes;
if (p == 0) {
img[k + 0] = color[0];
img[k + 1] = color[1];
img[k + 2] = color[2];
}
else {
img[k + 0] = 0;
img[k + 1] = 0;
img[k + 2] = 0;
}
}
}
glTexImage2D(GL_TEXTURE_2D, level, GL_RGB, width, height, 0,
GL_RGB, GL_UNSIGNED_BYTE, img);
}
static void makeImages(void)
{
int i, j;
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 < 64; i++) {
for (j = 0; j < 64; j++) {
mipmapImage64[i][j][0] = 0;
mipmapImage64[i][j][1] = 255;
mipmapImage64[i][j][2] = 255;
}
}
for (i = 0; i < 32; i++) {
for (j = 0; j < 32; j++) {
mipmapImage32[i][j][0] = 255;
mipmapImage32[i][j][1] = 255;
mipmapImage32[i][j][2] = 0;
}
}
for (i = 0; i < 16; i++) {
for (j = 0; j < 16; j++) {
mipmapImage16[i][j][0] = 255;
mipmapImage16[i][j][1] = 0;
mipmapImage16[i][j][2] = 255;
}
}
for (i = 0; i < 8; i++) {
for (j = 0; j < 8; j++) {
mipmapImage8[i][j][0] = 255;
mipmapImage8[i][j][1] = 0;
mipmapImage8[i][j][2] = 0;
}
}
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) {
mipmapImage4[i][j][0] = 0;
mipmapImage4[i][j][1] = 255;
mipmapImage4[i][j][2] = 0;
}
}
for (i = 0; i < 2; i++) {
for (j = 0; j < 2; j++) {
mipmapImage2[i][j][0] = 0;
mipmapImage2[i][j][1] = 0;
mipmapImage2[i][j][2] = 255;
}
}
mipmapImage1[0][0][0] = 255;
mipmapImage1[0][0][1] = 255;
mipmapImage1[0][0][2] = 255;
for (i = 0; i < 8; i++) {
MakeImage(i, sz, sz, colors[i]);
sz /= 2;
}
}
static void myinit(void)
@@ -122,22 +112,9 @@ static void myinit(void)
glShadeModel(GL_FLAT);
glTranslatef(0.0, 0.0, -3.6);
makeImages();
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexImage2D(GL_TEXTURE_2D, 0, 3, 64, 64, 0,
GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage64[0][0][0]);
glTexImage2D(GL_TEXTURE_2D, 1, 3, 32, 32, 0,
GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage32[0][0][0]);
glTexImage2D(GL_TEXTURE_2D, 2, 3, 16, 16, 0,
GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage16[0][0][0]);
glTexImage2D(GL_TEXTURE_2D, 3, 3, 8, 8, 0,
GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage8[0][0][0]);
glTexImage2D(GL_TEXTURE_2D, 4, 3, 4, 4, 0,
GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage4[0][0][0]);
glTexImage2D(GL_TEXTURE_2D, 5, 3, 2, 2, 0,
GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage2[0][0][0]);
glTexImage2D(GL_TEXTURE_2D, 6, 3, 1, 1, 0,
GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage1[0][0][0]);
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);
@@ -146,8 +123,9 @@ static void myinit(void)
static void display(void)
{
printf("GL_TEXTURE_BASE_LEVEL = %d GL_TEXTURE_MAX_LEVEL = %d filter = %s\n",
BaseLevel, MaxLevel,
GLfloat tcm = 4.0;
printf("GL_TEXTURE_BASE_LEVEL = %d GL_TEXTURE_MAX_LEVEL = %d Bias = %.2g filter = %s\n",
BaseLevel, MaxLevel, LodBias,
NearestFilter ? "LINEAR" : "NEAREST");
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, BaseLevel);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, MaxLevel);
@@ -163,12 +141,14 @@ static void display(void)
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, 8.0); glVertex3f(-2.0, 1.0, 0.0);
glTexCoord2f(8.0, 8.0); glVertex3f(3000.0, 1.0, -6000.0);
glTexCoord2f(8.0, 0.0); glVertex3f(3000.0, -1.0, -6000.0);
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();
}
@@ -209,6 +189,12 @@ key(unsigned char k, int x, int y)
if (MaxLevel > 10)
MaxLevel = 10;
break;
case 'l':
LodBias -= 0.02;
break;
case 'L':
LodBias += 0.02;
break;
case 'f':
NearestFilter = !NearestFilter;
break;
@@ -235,7 +221,7 @@ int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize (500, 500);
glutInitWindowSize (600, 600);
glutCreateWindow (argv[0]);
myinit();
glutReshapeFunc (myReshape);