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-rw-r--r--progs/tests/texwrap.c303
1 files changed, 303 insertions, 0 deletions
diff --git a/progs/tests/texwrap.c b/progs/tests/texwrap.c
new file mode 100644
index 000000000..35f5050ef
--- /dev/null
+++ b/progs/tests/texwrap.c
@@ -0,0 +1,303 @@
+/* $Id: texwrap.c,v 1.7 2003/09/02 19:25:18 idr Exp $ */
+
+/*
+ * Test texture wrap modes.
+ * Press 'b' to toggle texture image borders. You should see the same
+ * rendering whether or not you're using borders.
+ *
+ * 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
+#define GL_CLAMP_TO_BORDER 0x812D
+#endif
+
+#ifndef GL_MIRRORED_REPEAT
+#define GL_MIRRORED_REPEAT 0x8370
+#endif
+
+#ifndef GL_EXT_texture_mirror_clamp
+#define GL_MIRROR_CLAMP_EXT 0x8742
+#define GL_MIRROR_CLAMP_TO_EDGE_EXT 0x8743
+#define GL_MIRROR_CLAMP_TO_BORDER_EXT 0x8912
+#endif
+
+#define BORDER_TEXTURE 1
+#define NO_BORDER_TEXTURE 2
+
+#define SIZE 8
+static GLubyte BorderImage[SIZE+2][SIZE+2][4];
+static GLubyte NoBorderImage[SIZE][SIZE][4];
+static GLuint Border = 0;
+
+
+#define WRAP_MODE(m) { m , # m, GL_TRUE, 1.0, { NULL, NULL } }
+#define WRAP_EXT(m,e1,e2,v) { m , # m, GL_FALSE, v, { e1, e2 } }
+
+struct wrap_mode {
+ GLenum mode;
+ const char * name;
+ GLboolean supported;
+ GLfloat version;
+ const char * extension_names[2];
+};
+
+static struct wrap_mode modes[] = {
+ WRAP_MODE( GL_REPEAT ),
+ WRAP_MODE( GL_CLAMP ),
+ WRAP_EXT ( GL_CLAMP_TO_EDGE, "GL_EXT_texture_edge_clamp",
+ "GL_SGIS_texture_edge_clamp",
+ 1.2 ),
+ WRAP_EXT ( GL_CLAMP_TO_BORDER, "GL_ARB_texture_border_clamp",
+ "GL_SGIS_texture_border_clamp",
+ 1.3 ),
+ WRAP_EXT ( GL_MIRRORED_REPEAT, "GL_ARB_texture_mirrored_repeat",
+ "GL_IBM_texture_mirrored_repeat",
+ 1.4 ),
+ WRAP_EXT ( GL_MIRROR_CLAMP_EXT, "GL_ATI_texture_mirror_once",
+ "GL_EXT_texture_mirror_clamp",
+ 999.0 ),
+ WRAP_EXT ( GL_MIRROR_CLAMP_TO_EDGE_EXT, "GL_ATI_texture_mirror_once",
+ "GL_EXT_texture_mirror_clamp",
+ 999.0 ),
+ WRAP_EXT ( GL_MIRROR_CLAMP_TO_BORDER_EXT, "GL_EXT_texture_mirror_clamp",
+ NULL,
+ 999.0 ),
+ { 0 }
+};
+
+static void
+PrintString(const char *s)
+{
+ while (*s) {
+ glutBitmapCharacter(GLUT_BITMAP_8_BY_13, (int) *s);
+ s++;
+ }
+}
+
+
+static void Display( void )
+{
+ GLenum i, j;
+ GLint offset;
+ GLfloat version;
+
+ /* Fill in the extensions that are supported.
+ */
+
+ version = atof( (char *) glGetString( GL_VERSION ) );
+ for ( i = 0 ; modes[i].mode != 0 ; i++ ) {
+ if ( ((modes[i].extension_names[0] != NULL)
+ && glutExtensionSupported(modes[i].extension_names[0]))
+ || ((modes[i].extension_names[1] != NULL)
+ && glutExtensionSupported(modes[i].extension_names[1])) ) {
+ modes[i].supported = GL_TRUE;
+ }
+ else if ( !modes[i].supported && (modes[i].version <= version) ) {
+ fprintf( stderr, "WARNING: OpenGL library meets minimum version\n"
+ " requirement for %s, but the\n"
+ " extension string is not advertised.\n"
+ " (%s%s%s)\n",
+ modes[i].name,
+ modes[i].extension_names[0],
+ (modes[i].extension_names[1] != NULL)
+ ? " or " : "",
+ (modes[i].extension_names[1] != NULL)
+ ? modes[i].extension_names[1] : "" );
+ modes[i].supported = GL_TRUE;
+ }
+ }
+
+
+ glClearColor(0.5, 0.5, 0.5, 1.0);
+ glClear( GL_COLOR_BUFFER_BIT );
+
+#if 0
+ /* draw texture as image */
+ glDisable(GL_TEXTURE_2D);
+ glWindowPos2iARB(1, 1);
+ glDrawPixels(6, 6, GL_RGBA, GL_UNSIGNED_BYTE, (void *) TexImage);
+#endif
+
+ glBindTexture(GL_TEXTURE_2D, Border ? BORDER_TEXTURE : NO_BORDER_TEXTURE);
+
+
+ /* loop over min/mag filters */
+ for (i = 0; i < 2; i++) {
+ offset = 0;
+
+ 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 < modes[j].mode != 0; j++) {
+ const GLfloat x0 = 0, y0 = 0, x1 = 140, y1 = 140;
+ const GLfloat b = 1.2;
+ const GLfloat s0 = -b, t0 = -b, s1 = 1.0+b, t1 = 1.0+b;
+
+ if ( modes[j].supported != GL_TRUE )
+ continue;
+
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, modes[j].mode);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, modes[j].mode);
+
+ glPushMatrix();
+ glTranslatef(offset * 150 + 10, i * 150 + 40, 0);
+ offset++;
+
+ glEnable(GL_TEXTURE_2D);
+ glColor3f(1, 1, 1);
+ glBegin(GL_POLYGON);
+ glTexCoord2f(s0, t0); glVertex2f(x0, y0);
+ glTexCoord2f(s1, t0); glVertex2f(x1, y0);
+ glTexCoord2f(s1, t1); glVertex2f(x1, y1);
+ glTexCoord2f(s0, t1); glVertex2f(x0, y1);
+ glEnd();
+
+ /* draw red outline showing bounds of texture at s=0,1 and t=0,1 */
+ glDisable(GL_TEXTURE_2D);
+ glColor3f(1, 0, 0);
+ glBegin(GL_LINE_LOOP);
+ glVertex2f(x0 + b * (x1-x0) / (s1-s0), y0 + b * (y1-y0) / (t1-t0));
+ glVertex2f(x1 - b * (x1-x0) / (s1-s0), y0 + b * (y1-y0) / (t1-t0));
+ glVertex2f(x1 - b * (x1-x0) / (s1-s0), y1 - b * (y1-y0) / (t1-t0));
+ glVertex2f(x0 + b * (x1-x0) / (s1-s0), y1 - b * (y1-y0) / (t1-t0));
+ glEnd();
+
+ glPopMatrix();
+ }
+ }
+
+ glDisable(GL_TEXTURE_2D);
+ glColor3f(1, 1, 1);
+ offset = 0;
+ for (i = 0; i < modes[i].mode != 0; i++) {
+ if ( modes[i].supported ) {
+ glWindowPos2iARB( offset * 150 + 10, 5 + ((offset & 1) * 15) );
+ PrintString(modes[i].name);
+ offset++;
+ }
+ }
+
+ 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 'b':
+ Border = !Border;
+ printf("Texture Border Size = %d\n", Border);
+ break;
+ case 27:
+ exit(0);
+ break;
+ }
+ glutPostRedisplay();
+}
+
+
+static void Init( void )
+{
+ static const GLubyte border[4] = { 0, 255, 0, 255 };
+ static const GLfloat borderf[4] = { 0, 1.0, 0, 1.0 };
+ 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 */
+ BorderImage[i][j][0] = border[0];
+ BorderImage[i][j][1] = border[1];
+ BorderImage[i][j][2] = border[2];
+ BorderImage[i][j][3] = border[3];
+ }
+ else if ((i + j) & 1) {
+ /* white */
+ BorderImage[i][j][0] = 255;
+ BorderImage[i][j][1] = 255;
+ BorderImage[i][j][2] = 255;
+ BorderImage[i][j][3] = 255;
+ }
+ else {
+ /* black */
+ BorderImage[i][j][0] = 0;
+ BorderImage[i][j][1] = 0;
+ BorderImage[i][j][2] = 0;
+ BorderImage[i][j][3] = 0;
+ }
+ }
+ }
+
+ glBindTexture(GL_TEXTURE_2D, BORDER_TEXTURE);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, SIZE+2, SIZE+2, 1,
+ GL_RGBA, GL_UNSIGNED_BYTE, (void *) BorderImage);
+
+ for (i = 0; i < SIZE; i++) {
+ for (j = 0; j < SIZE; j++) {
+ if ((i + j) & 1) {
+ /* white */
+ NoBorderImage[i][j][0] = 255;
+ NoBorderImage[i][j][1] = 255;
+ NoBorderImage[i][j][2] = 255;
+ NoBorderImage[i][j][3] = 255;
+ }
+ else {
+ /* black */
+ NoBorderImage[i][j][0] = 0;
+ NoBorderImage[i][j][1] = 0;
+ NoBorderImage[i][j][2] = 0;
+ NoBorderImage[i][j][3] = 0;
+ }
+ }
+ }
+
+ glBindTexture(GL_TEXTURE_2D, NO_BORDER_TEXTURE);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, SIZE, SIZE, 0,
+ GL_RGBA, GL_UNSIGNED_BYTE, (void *) NoBorderImage);
+ glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, borderf);
+}
+
+
+int main( int argc, char *argv[] )
+{
+ glutInit( &argc, argv );
+ glutInitWindowPosition( 0, 0 );
+ glutInitWindowSize( 800, 355 );
+ glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
+ glutCreateWindow(argv[0]);
+ glutReshapeFunc( Reshape );
+ glutKeyboardFunc( Key );
+ glutDisplayFunc( Display );
+ Init();
+ glutMainLoop();
+ return 0;
+}
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