diff options
Diffstat (limited to 'progs/demos/textures.c')
| -rw-r--r-- | progs/demos/textures.c | 104 |
1 files changed, 87 insertions, 17 deletions
diff --git a/progs/demos/textures.c b/progs/demos/textures.c index 9f11604635..b7bf135d21 100644 --- a/progs/demos/textures.c +++ b/progs/demos/textures.c @@ -9,6 +9,9 @@ #include <GL/glut.h> #include "readtex.h" +#define TEST_CLAMP 0 +#define TEST_MIPMAPS 0 + #define MAX_TEXTURES 8 @@ -16,7 +19,8 @@ static int Win; static GLfloat Xrot = 0, Yrot = 0, Zrot = 0; static GLboolean Anim = GL_TRUE; static GLboolean Blend = GL_FALSE; -static GLboolean MipMap = 1+GL_FALSE; +static GLuint Filter = 0; +static GLboolean Clamp = GL_FALSE; static GLuint NumTextures; static GLuint Textures[MAX_TEXTURES]; @@ -32,6 +36,22 @@ static const char *DefaultFiles[] = { }; +#define NUM_FILTERS 5 +static +struct filter { + GLenum min, mag; + const char *name; +} FilterModes[NUM_FILTERS] = { + { GL_NEAREST, GL_NEAREST, "Nearest,Nearest" }, + { GL_LINEAR, GL_LINEAR, "Linear,Linear" }, + { GL_NEAREST_MIPMAP_NEAREST, GL_NEAREST, "NearestMipmapNearest,Nearest" }, + { GL_LINEAR_MIPMAP_NEAREST, GL_LINEAR, "LinearMipmapNearest,Linear" }, + { GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR, "LinearMipmapLinear,Linear" } +}; + + + + static void Idle(void) { @@ -58,10 +78,17 @@ DrawTextures(void) glBindTexture(GL_TEXTURE_2D, Textures[i]); glBegin(GL_POLYGON); +#if TEST_CLAMP + glTexCoord2f( -0.5, -0.5 ); glVertex2f( -ar, -1.0 ); + glTexCoord2f( 1.5, -0.5 ); glVertex2f( ar, -1.0 ); + glTexCoord2f( 1.5, 1.5 ); glVertex2f( ar, 1.0 ); + glTexCoord2f( -0.5, 1.5 ); glVertex2f( -ar, 1.0 ); +#else glTexCoord2f( 0.0, 0.0 ); glVertex2f( -ar, -1.0 ); glTexCoord2f( 1.0, 0.0 ); glVertex2f( ar, -1.0 ); glTexCoord2f( 1.0, 1.0 ); glVertex2f( ar, 1.0 ); glTexCoord2f( 0.0, 1.0 ); glVertex2f( -ar, 1.0 ); +#endif glEnd(); glPopMatrix(); @@ -137,19 +164,23 @@ Randomize(void) static void -SetTexFilters(void) +SetTexParams(void) { GLuint i; for (i = 0; i < NumTextures; i++) { glBindTexture(GL_TEXTURE_2D, Textures[i]); - if (MipMap) { - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, - GL_LINEAR_MIPMAP_LINEAR); - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, + FilterModes[Filter].min); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, + FilterModes[Filter].mag); + + if (Clamp) { + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); } else { - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); } } } @@ -163,6 +194,7 @@ Key(unsigned char key, int x, int y) (void) y; switch (key) { case 'a': + case ' ': Anim = !Anim; if (Anim) glutIdleFunc(Idle); @@ -172,12 +204,19 @@ Key(unsigned char key, int x, int y) case 'b': Blend = !Blend; break; - case 'm': - MipMap = !MipMap; - SetTexFilters(); + case 'f': + Filter = (Filter + 1) % NUM_FILTERS; + SetTexParams(); break; case 'r': Randomize(); + break; +#if TEST_CLAMP + case 'c': + Clamp = !Clamp; + SetTexParams(); + break; +#endif case 'z': Zrot -= step; break; @@ -190,9 +229,9 @@ Key(unsigned char key, int x, int y) break; } - printf("Blend=%s MipMap=%s\n", + printf("Blend=%s Filter=%s\n", Blend ? "Y" : "n", - MipMap ? "Y" : "n"); + FilterModes[Filter].name); glutPostRedisplay(); } @@ -231,15 +270,46 @@ LoadTextures(GLuint n, const char *files[]) glGenTextures(n, Textures); + SetTexParams(); + for (i = 0; i < n; i++) { GLint w, h; glBindTexture(GL_TEXTURE_2D, Textures[i]); - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); +#if TEST_MIPMAPS + { + static const GLubyte color[9][4] = { + {255, 0, 0}, + {0, 255, 0}, + {0, 0, 255}, + {0, 255, 255}, + {255, 0, 255}, + {255, 255, 0}, + {255, 128, 255}, + {128, 128, 128}, + {64, 64, 64} + }; + + GLubyte image[256*256*4]; + int i, level; + w = h = 256; + for (level = 0; level <= 8; level++) { + for (i = 0; i < w * h; i++) { + image[i*4+0] = color[level][0]; + image[i*4+1] = color[level][1]; + image[i*4+2] = color[level][2]; + image[i*4+3] = color[level][3]; + } + printf("Load level %d: %d x %d\n", level, w>>level, h>>level); + glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, w>>level, h>>level, 0, + GL_RGBA, GL_UNSIGNED_BYTE, image); + } + } +#else if (!LoadRGBMipmaps2(files[i], GL_TEXTURE_2D, GL_RGB, &w, &h)) { printf("Error: couldn't load %s\n", files[i]); exit(1); } +#endif TexAspect[i] = (float) w / (float) h; printf("Loaded %s\n", files[i]); } @@ -277,7 +347,7 @@ Usage(void) printf("Keys:\n"); printf(" a - toggle animation\n"); printf(" b - toggle blending\n"); - printf(" m - toggle mipmapping\n"); + printf(" f - change texture filter mode\n"); printf(" r - randomize\n"); printf(" ESC - exit\n"); } @@ -288,7 +358,7 @@ main(int argc, char *argv[]) { glutInit(&argc, argv); glutInitWindowPosition(0, 0); - glutInitWindowSize(400, 400); + glutInitWindowSize(700, 700); glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); Win = glutCreateWindow(argv[0]); glutReshapeFunc(Reshape); |