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| -rw-r--r-- | progs/tests/texwrap.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/progs/tests/texwrap.c b/progs/tests/texwrap.c new file mode 100644 index 0000000000..dce8b4fbda --- /dev/null +++ b/progs/tests/texwrap.c @@ -0,0 +1,181 @@ +/* $Id: texwrap.c,v 1.1 2001/03/26 19:45:57 brianp Exp $ */ + +/* + * Test texture wrap modes. + * + * Brian Paul March 2001 + */ + + +#define GL_GLEXT_PROTOTYPES +#include <stdio.h> +#include <stdlib.h> +#include <math.h> +#include <GL/glut.h> + + +#ifndef GL_CLAMP_TO_BORDER_ARB +#define GL_CLAMP_TO_BORDER_ARB 0x812D +#endif + + +#define SIZE 4 +static GLubyte TexImage[SIZE+2][SIZE+2][4]; + + +static void +PrintString(const char *s) +{ + while (*s) { + glutBitmapCharacter(GLUT_BITMAP_8_BY_13, (int) *s); + s++; + } +} + + +static void Display( void ) +{ + static const GLenum modes[] = { + GL_REPEAT, + GL_CLAMP, + GL_CLAMP_TO_EDGE, + GL_CLAMP_TO_BORDER_ARB + }; + static const char *names[] = { + "GL_REPEAT", + "GL_CLAMP", + "GL_CLAMP_TO_EDGE", + "GL_CLAMP_TO_BORDER_ARB" + }; + + GLint i, j; + GLint numModes; + + numModes = glutExtensionSupported("GL_ARB_texture_border_clamp") ? 4 : 3; + + glClearColor(0.5, 0.5, 0.5, 1.0); + glClear( GL_COLOR_BUFFER_BIT ); + +#if 0 + /* draw texture as image */ + glDisable(GL_TEXTURE_2D); + glWindowPos2iMESA(1, 1); + glDrawPixels(6, 6, GL_RGBA, GL_UNSIGNED_BYTE, (void *) TexImage); +#endif + + glEnable(GL_TEXTURE_2D); + + /* loop over min/mag filters */ + for (i = 0; i < 2; i++) { + if (i) { + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + } + else { + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); + } + + /* loop over border modes */ + for (j = 0; j < numModes; j++) { + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, modes[j]); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, modes[j]); + + glPushMatrix(); + glTranslatef(j * 150 + 10, i * 150 + 25, 0); + + glBegin(GL_POLYGON); + glTexCoord2f(-0.2, -0.2); glVertex2f( 0, 0); + glTexCoord2f( 1.2, -0.2); glVertex2f(140, 0); + glTexCoord2f( 1.2, 1.2); glVertex2f(140, 140); + glTexCoord2f(-0.2, 1.2); glVertex2f( 0, 140); + glEnd(); + + glPopMatrix(); + } + } + + glDisable(GL_TEXTURE_2D); + for (i = 0; i < numModes; i++) { + glWindowPos2iMESA( i * 150 + 10, 5); + PrintString(names[i]); + } + + glutSwapBuffers(); +} + + +static void Reshape( int width, int height ) +{ + glViewport( 0, 0, width, height ); + glMatrixMode( GL_PROJECTION ); + glLoadIdentity(); + glOrtho(0, width, 0, height, -1, 1); + glMatrixMode( GL_MODELVIEW ); + glLoadIdentity(); +} + + +static void Key( unsigned char key, int x, int y ) +{ + (void) x; + (void) y; + switch (key) { + case 27: + exit(0); + break; + } + glutPostRedisplay(); +} + + +static void Init( void ) +{ + static const GLubyte border[4] = { 0, 255, 0, 255 }; + GLint i, j; + + for (i = 0; i < SIZE+2; i++) { + for (j = 0; j < SIZE+2; j++) { + if (i == 0 || j == 0 || i == SIZE+1 || j == SIZE+1) { + /* border color */ + TexImage[i][j][0] = border[0]; + TexImage[i][j][1] = border[1]; + TexImage[i][j][2] = border[2]; + TexImage[i][j][3] = border[3]; + } + else if ((i + j) & 1) { + /* white */ + TexImage[i][j][0] = 255; + TexImage[i][j][1] = 255; + TexImage[i][j][2] = 255; + TexImage[i][j][3] = 255; + } + else { + /* black */ + TexImage[i][j][0] = 0; + TexImage[i][j][1] = 0; + TexImage[i][j][2] = 0; + TexImage[i][j][3] = 0; + } + } + } + + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, SIZE+2, SIZE+2, 1, + GL_RGBA, GL_UNSIGNED_BYTE, (void *) TexImage); +} + + +int main( int argc, char *argv[] ) +{ + glutInit( &argc, argv ); + glutInitWindowPosition( 0, 0 ); + glutInitWindowSize( 650, 340 ); + glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE ); + glutCreateWindow(argv[0]); + glutReshapeFunc( Reshape ); + glutKeyboardFunc( Key ); + glutDisplayFunc( Display ); + Init(); + glutMainLoop(); + return 0; +} |