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added -c option to exercise convolution of glTexImage2D

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This commit is contained in:
Brian Paul
2004-05-04 23:57:12 +00:00
parent 2b012578ee
commit cb40ebd8a2
1 changed files with 64 additions and 16 deletions
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80
progs/demos/gloss.c
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@@ -34,6 +34,9 @@
#define ANIMATE 3
#define QUIT 100
/* for convolution */
#define FILTER_SIZE 7
static GLuint CylinderObj = 0;
static GLuint TeapotObj = 0;
static GLuint Object = 0;
@@ -226,6 +229,22 @@ static void SpecialKey( int key, int x, int y )
static void Init( int argc, char *argv[] )
{
GLboolean convolve = GL_FALSE;
int i;
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-info")==0) {
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
}
else if (strcmp(argv[i], "-c")==0) {
convolve = GL_TRUE;
}
}
/* Cylinder object */
{
static GLfloat height = 100.0;
@@ -322,17 +341,53 @@ static void Init( int argc, char *argv[] )
glBindTexture(GL_TEXTURE_2D, SpecularTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
#if 1
glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
#else
glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_NORMAL_MAP_NV);
glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_NORMAL_MAP_NV);
glTexGeni(GL_R, GL_TEXTURE_GEN_MODE, GL_NORMAL_MAP_NV);
#endif
if (!LoadRGBMipmaps(SPECULAR_TEXTURE_FILE, GL_RGB)) {
printf("Error: couldn't load texture image file %s\n", SPECULAR_TEXTURE_FILE);
exit(1);
if (convolve) {
/* use convolution to blur the texture to simulate a dull finish
* on the object.
*/
GLubyte *img;
GLenum format;
GLint w, h;
GLfloat filter[FILTER_SIZE][FILTER_SIZE][4];
for (h = 0; h < FILTER_SIZE; h++) {
for (w = 0; w < FILTER_SIZE; w++) {
const GLfloat k = 1.0 / (FILTER_SIZE * FILTER_SIZE);
filter[h][w][0] = k;
filter[h][w][1] = k;
filter[h][w][2] = k;
filter[h][w][3] = k;
}
}
glEnable(GL_CONVOLUTION_2D);
glConvolutionParameteri(GL_CONVOLUTION_2D,
GL_CONVOLUTION_BORDER_MODE, GL_CONSTANT_BORDER);
glConvolutionFilter2D(GL_CONVOLUTION_2D, GL_RGBA,
FILTER_SIZE, FILTER_SIZE,
GL_RGBA, GL_FLOAT, filter);
img = LoadRGBImage(SPECULAR_TEXTURE_FILE, &w, &h, &format);
if (!img) {
printf("Error: couldn't load texture image file %s\n",
SPECULAR_TEXTURE_FILE);
exit(1);
}
glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, w, h, 0,
format, GL_UNSIGNED_BYTE, img);
free(img);
}
else {
/* regular path */
if (!LoadRGBMipmaps(SPECULAR_TEXTURE_FILE, GL_RGB)) {
printf("Error: couldn't load texture image file %s\n",
SPECULAR_TEXTURE_FILE);
exit(1);
}
}
/* misc */
@@ -342,13 +397,6 @@ static void Init( int argc, char *argv[] )
glEnable(GL_NORMALIZE);
glPolygonOffset( -1, -1 );
if (argc > 1 && strcmp(argv[1], "-info")==0) {
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
}
}