new wrap modes (Ian Romanick)
This commit is contained in:
Brian Paul
parent
944ea204a8
commit
bc36ee25d8
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@ -1,4 +1,4 @@
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/* $Id: texwrap.c,v 1.2 2001/04/12 20:50:26 brianp Exp $ */
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/* $Id: texwrap.c,v 1.3 2002/10/17 17:39:37 brianp Exp $ */
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/*
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* Test texture wrap modes.
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@ -16,10 +16,18 @@
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#include <GL/glut.h>
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#ifndef GL_CLAMP_TO_BORDER_ARB
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#define GL_CLAMP_TO_BORDER_ARB 0x812D
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#ifndef GL_CLAMP_TO_BORDER
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#define GL_CLAMP_TO_BORDER 0x812D
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#endif
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#ifndef GL_MIRRORED_REPEAT
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#define GL_MIRRORED_REPEAT 0x8370
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#endif
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#ifndef GL_ATI_texture_mirror_once
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#define GL_MIRROR_CLAMP_ATI 0x8742
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#define GL_MIRROR_CLAMP_TO_EDGE_ATI 0x8743
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#endif
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#define BORDER_TEXTURE 1
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#define NO_BORDER_TEXTURE 2
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@ -30,6 +38,38 @@ static GLubyte NoBorderImage[SIZE][SIZE][4];
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static GLuint Border = 1;
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#define WRAP_MODE(m) { m , # m, GL_TRUE, 1.0, { NULL, NULL } }
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#define WRAP_EXT(m,e1,e2,v) { m , # m, GL_FALSE, v, { e1, e2 } }
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struct wrap_mode {
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GLenum mode;
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const char * name;
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GLboolean supported;
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GLfloat version;
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const char * extension_names[2];
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};
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static struct wrap_mode modes[] = {
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WRAP_MODE( GL_REPEAT ),
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WRAP_MODE( GL_CLAMP ),
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WRAP_EXT ( GL_CLAMP_TO_EDGE, "GL_EXT_texture_edge_clamp",
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"GL_SGIS_texture_edge_clamp",
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1.2 ),
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WRAP_EXT ( GL_CLAMP_TO_BORDER, "GL_ARB_texture_border_clamp",
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"GL_SGIS_texture_border_clamp",
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1.3 ),
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WRAP_EXT ( GL_MIRRORED_REPEAT, "GL_ARB_texture_mirrored_repeat",
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"GL_IBM_texture_mirrored_repeat",
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1.4 ),
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WRAP_EXT ( GL_MIRROR_CLAMP_ATI, "GL_ATI_texture_mirror_once",
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NULL,
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999.0 ),
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WRAP_EXT ( GL_MIRROR_CLAMP_TO_EDGE_ATI, "GL_ATI_texture_mirror_once",
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NULL,
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999.0 ),
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{ 0 }
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};
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static void
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PrintString(const char *s)
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{
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@ -42,23 +82,36 @@ PrintString(const char *s)
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static void Display( void )
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{
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static const GLenum modes[] = {
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GL_REPEAT,
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GL_CLAMP,
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GL_CLAMP_TO_EDGE,
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GL_CLAMP_TO_BORDER_ARB
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};
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static const char *names[] = {
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"GL_REPEAT",
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"GL_CLAMP",
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"GL_CLAMP_TO_EDGE",
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"GL_CLAMP_TO_BORDER_ARB"
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};
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GLint i, j;
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GLint numModes;
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GLint offset;
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GLfloat version;
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/* Fill in the extensions that are supported.
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*/
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version = atof( (char *) glGetString( GL_VERSION ) );
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for ( i = 0 ; modes[i].mode != 0 ; i++ ) {
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if ( ((modes[i].extension_names[0] != NULL)
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&& glutExtensionSupported(modes[i].extension_names[0]))
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|| ((modes[i].extension_names[1] != NULL)
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&& glutExtensionSupported(modes[i].extension_names[1])) ) {
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modes[i].supported = GL_TRUE;
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}
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else if ( !modes[i].supported && (modes[i].version <= version) ) {
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fprintf( stderr, "WARNING: OpenGL library meets minimum version\n"
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" requirement for %s, but the\n"
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" extension string is not advertised.\n"
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" (%s%s%s)\n",
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modes[i].name,
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modes[i].extension_names[0],
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(modes[i].extension_names[1] != NULL)
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? " or " : "",
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(modes[i].extension_names[1] != NULL)
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? modes[i].extension_names[1] : "" );
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modes[i].supported = GL_TRUE;
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}
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}
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numModes = glutExtensionSupported("GL_ARB_texture_border_clamp") ? 4 : 3;
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glClearColor(0.5, 0.5, 0.5, 1.0);
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glClear( GL_COLOR_BUFFER_BIT );
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@ -72,8 +125,11 @@ static void Display( void )
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glBindTexture(GL_TEXTURE_2D, Border ? BORDER_TEXTURE : NO_BORDER_TEXTURE);
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/* loop over min/mag filters */
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for (i = 0; i < 2; i++) {
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offset = 0;
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if (i) {
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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@ -84,15 +140,20 @@ static void Display( void )
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}
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/* loop over border modes */
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for (j = 0; j < numModes; j++) {
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for (j = 0; j < modes[j].mode != 0; j++) {
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const GLfloat x0 = 0, y0 = 0, x1 = 140, y1 = 140;
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const GLfloat b = 0.2;
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const GLfloat s0 = -b, t0 = -b, s1 = 1.0+b, t1 = 1.0+b;
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, modes[j]);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, modes[j]);
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if ( modes[j].supported != GL_TRUE )
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continue;
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, modes[j].mode);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, modes[j].mode);
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glPushMatrix();
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glTranslatef(j * 150 + 10, i * 150 + 25, 0);
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glTranslatef(offset * 150 + 10, i * 150 + 40, 0);
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offset++;
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glEnable(GL_TEXTURE_2D);
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glColor3f(1, 1, 1);
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@ -119,9 +180,13 @@ static void Display( void )
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glDisable(GL_TEXTURE_2D);
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glColor3f(1, 1, 1);
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for (i = 0; i < numModes; i++) {
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glWindowPos2iMESA( i * 150 + 10, 5);
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PrintString(names[i]);
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offset = 0;
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for (i = 0; i < modes[i].mode != 0; i++) {
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if ( modes[i].supported ) {
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glWindowPos2iMESA( offset * 150 + 10, 5 + ((offset & 1) * 15) );
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PrintString(modes[i].name);
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offset++;
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}
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}
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glutSwapBuffers();
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@ -192,7 +257,6 @@ static void Init( void )
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, SIZE+2, SIZE+2, 1,
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GL_RGBA, GL_UNSIGNED_BYTE, (void *) BorderImage);
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for (i = 0; i < SIZE; i++) {
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for (j = 0; j < SIZE; j++) {
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if ((i + j) & 1) {
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@ -223,7 +287,7 @@ int main( int argc, char *argv[] )
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{
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glutInit( &argc, argv );
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glutInitWindowPosition( 0, 0 );
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glutInitWindowSize( 650, 340 );
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glutInitWindowSize( 800, 355 );
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glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
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glutCreateWindow(argv[0]);
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glutReshapeFunc( Reshape );
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