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netgen/ng/Togl-1.7/texture.c
Joachim Schoeberl eeac7442f3 including togl
2014-09-15 08:48:30 +00:00

609 lines
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C
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/* $Id: texture.c,v 1.10 2005/04/23 07:49:14 gregcouch Exp $ */
/*
* Togl - a Tk OpenGL widget
* Copyright (C) 1996-1997 Brian Paul and Ben Bederson
* See the LICENSE file for copyright details.
*/
/*
* An example Togl program demonstrating texture mapping
*/
#include "togl.h"
#include <stdlib.h>
#include <string.h>
#if defined(TOGL_AGL) || defined(TOGL_AGL_CLASSIC)
# include <OpenGL/glu.h>
#else
# include <GL/glu.h>
#endif
#include "image.h"
/*
* The following variable is a special hack that is needed in order for
* Sun shared libraries to be used for Tcl.
*/
#ifdef SUN
extern int matherr();
int *tclDummyMathPtr = (int *) matherr;
#endif
#define CHECKER 0
#define FACE 1
#define TREE 2
static GLenum minfilter = GL_NEAREST_MIPMAP_LINEAR;
static GLenum magfilter = GL_LINEAR;
static GLenum swrap = GL_REPEAT;
static GLenum twrap = GL_REPEAT;
static GLenum envmode = GL_MODULATE;
static GLubyte polycolor[4] = { 255, 255, 255, 255 };
static int image = CHECKER;
static GLfloat coord_scale = 1.0;
static GLfloat xrot = 0.0;
static GLfloat yrot = 0.0;
static GLfloat scale = 1.0;
static GLint width, height;
static GLboolean blend = GL_FALSE;
/*
* Load a texture image. n is one of CHECKER, FACE or TREE.
*/
void
texture_image(int n)
{
if (n == CHECKER) {
#define WIDTH 64
#define HEIGHT 64
GLubyte teximage[WIDTH * HEIGHT][4];
int i, j;
for (i = 0; i < HEIGHT; i++) {
for (j = 0; j < WIDTH; j++) {
GLubyte value;
value = ((i / 4 + j / 4) % 2) ? 0xff : 0x00;
teximage[i * WIDTH + j][0] = value;
teximage[i * WIDTH + j][1] = value;
teximage[i * WIDTH + j][2] = value;
teximage[i * WIDTH + j][3] = value;
}
}
glEnable(GL_TEXTURE_2D);
gluBuild2DMipmaps(GL_TEXTURE_2D, 4, WIDTH, HEIGHT,
GL_RGBA, GL_UNSIGNED_BYTE, teximage);
blend = GL_FALSE;
#undef WIDTH
#undef HEIGHT
} else if (n == FACE) {
TK_RGBImageRec *img = tkRGBImageLoad("ben.rgb");
if (img) {
glEnable(GL_TEXTURE_2D);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
gluBuild2DMipmaps(GL_TEXTURE_2D, img->sizeZ, img->sizeX, img->sizeY,
img->sizeZ == 3 ? GL_RGB : GL_RGBA,
GL_UNSIGNED_BYTE, img->data);
blend = GL_TRUE;
}
} else if (n == TREE) {
TK_RGBImageRec *img = tkRGBImageLoad("tree2.rgba");
if (img) {
glEnable(GL_TEXTURE_2D);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
gluBuild2DMipmaps(GL_TEXTURE_2D, img->sizeZ, img->sizeX, img->sizeY,
img->sizeZ == 3 ? GL_RGB : GL_RGBA,
GL_UNSIGNED_BYTE, img->data);
blend = GL_TRUE;
}
} else {
abort();
}
}
/*
* Togl widget create callback. This is called by Tcl/Tk when the widget has
* been realized. Here's where one may do some one-time context setup or
* initializations.
*/
void
create_cb(Togl *togl)
{
glEnable(GL_DEPTH_TEST); /* Enable depth buffering */
texture_image(CHECKER);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, magfilter);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, minfilter);
}
/*
* Togl widget reshape callback. This is called by Tcl/Tk when the widget
* has been resized. Typically, we call glViewport and perhaps setup the
* projection matrix.
*/
void
reshape_cb(Togl *togl)
{
width = Togl_Width(togl);
height = Togl_Height(togl);
glViewport(0, 0, width, height);
}
static void
check_error(char *where)
{
GLenum error;
while (1) {
error = glGetError();
if (error == GL_NO_ERROR) {
break;
}
printf("OpenGL error near %s: %s\n", where, gluErrorString(error));
}
}
/*
* Togl widget display callback. This is called by Tcl/Tk when the widget's
* contents have to be redrawn. Typically, we clear the color and depth
* buffers, render our objects, then swap the front/back color buffers.
*/
void
display_cb(Togl *togl)
{
float aspect = (float) width / (float) height;
check_error("begin display\n");
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
/* Draw background image */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glDisable(GL_TEXTURE_2D);
glDisable(GL_DEPTH_TEST);
glBegin(GL_POLYGON);
glColor3f(0.0, 0.0, 0.3);
glVertex2f(-1.0, -1.0);
glColor3f(0.0, 0.0, 0.3);
glVertex2f(1.0, -1.0);
glColor3f(0.0, 0.0, 0.9);
glVertex2f(1.0, 1.0);
glColor3f(0.0, 0.0, 0.9);
glVertex2f(-1.0, 1.0);
glEnd();
/* draw textured object */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-aspect, aspect, -1.0, 1.0, 2.0, 10.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0, 0.0, -5.0);
glScalef(scale, scale, scale);
glRotatef(yrot, 0.0, 1.0, 0.0);
glRotatef(xrot, 1.0, 0.0, 0.0);
glEnable(GL_DEPTH_TEST);
glEnable(GL_TEXTURE_2D);
glColor4ubv(polycolor);
if (blend) {
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
}
glBegin(GL_POLYGON);
glTexCoord2f(0.0, 0.0);
glVertex2f(-1.0, -1.0);
glTexCoord2f(coord_scale, 0.0);
glVertex2f(1.0, -1.0);
glTexCoord2f(coord_scale, coord_scale);
glVertex2f(1.0, 1.0);
glTexCoord2f(0.0, coord_scale);
glVertex2f(-1.0, 1.0);
glEnd();
glDisable(GL_BLEND);
Togl_SwapBuffers(togl);
}
/*
* Called when a magnification filter radio button is pressed.
*/
int
magfilter_cb(Togl *togl, int argc, CONST84 char *argv[])
{
Tcl_Interp *interp = Togl_Interp(togl);
if (strcmp(argv[2], "GL_NEAREST") == 0) {
magfilter = GL_NEAREST;
} else if (strcmp(argv[2], "GL_LINEAR") == 0) {
magfilter = GL_LINEAR;
} else {
Tcl_SetResult(interp, "unknown magnification filter type", TCL_STATIC);
return TCL_ERROR;
}
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, magfilter);
Togl_PostRedisplay(togl);
return TCL_OK;
}
/*
* Called when a minification filter radio button is pressed.
*/
int
minfilter_cb(Togl *togl, int argc, CONST84 char *argv[])
{
Tcl_Interp *interp = Togl_Interp(togl);
if (strcmp(argv[2], "GL_NEAREST") == 0) {
minfilter = GL_NEAREST;
} else if (strcmp(argv[2], "GL_LINEAR") == 0) {
minfilter = GL_LINEAR;
} else if (strcmp(argv[2], "GL_NEAREST_MIPMAP_NEAREST") == 0) {
minfilter = GL_NEAREST_MIPMAP_NEAREST;
} else if (strcmp(argv[2], "GL_LINEAR_MIPMAP_NEAREST") == 0) {
minfilter = GL_LINEAR_MIPMAP_NEAREST;
} else if (strcmp(argv[2], "GL_NEAREST_MIPMAP_LINEAR") == 0) {
minfilter = GL_NEAREST_MIPMAP_LINEAR;
} else if (strcmp(argv[2], "GL_LINEAR_MIPMAP_LINEAR") == 0) {
minfilter = GL_LINEAR_MIPMAP_LINEAR;
} else {
Tcl_SetResult(interp, "unknown minification filter type", TCL_STATIC);
return TCL_ERROR;
}
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, minfilter);
Togl_PostRedisplay(togl);
return TCL_OK;
}
int
xrot_cb(Togl *togl, int argc, CONST84 char *argv[])
{
Tcl_Interp *interp = Togl_Interp(togl);
/* error checking */
if (argc != 3) {
Tcl_SetResult(interp,
"wrong # args: should be \"pathName setXrot ?angle?\"",
TCL_STATIC);
return TCL_ERROR;
}
xrot = atof(argv[2]);
Togl_PostRedisplay(togl);
/* Let result string equal value */
strcpy(interp->result, argv[2]);
return TCL_OK;
}
int
yrot_cb(Togl *togl, int argc, CONST84 char *argv[])
{
Tcl_Interp *interp = Togl_Interp(togl);
/* error checking */
if (argc != 3) {
Tcl_SetResult(interp,
"wrong # args: should be \"pathName setYrot ?angle?\"",
TCL_STATIC);
return TCL_ERROR;
}
yrot = atof(argv[2]);
Togl_PostRedisplay(togl);
/* Let result string equal value */
strcpy(interp->result, argv[2]);
return TCL_OK;
}
int
scale_cb(Togl *togl, int argc, CONST84 char *argv[])
{
Tcl_Interp *interp = Togl_Interp(togl);
/* error checking */
if (argc != 3) {
Tcl_SetResult(interp,
"wrong # args: should be \"pathName scale ?value?\"",
TCL_STATIC);
return TCL_ERROR;
}
scale = atof(argv[2]);
Togl_PostRedisplay(togl);
/* Let result string equal value */
strcpy(interp->result, argv[2]);
return TCL_OK;
}
/*
* Called when S texture coordinate wrapping is changed.
*/
int
swrap_cb(Togl *togl, int argc, CONST84 char *argv[])
{
Tcl_Interp *interp = Togl_Interp(togl);
/* error checking */
if (argc != 3) {
Tcl_SetResult(interp,
"wrong # args: should be \"pathName swrap ?mode?\"",
TCL_STATIC);
return TCL_ERROR;
}
if (strcmp(argv[2], "GL_CLAMP") == 0) {
swrap = GL_CLAMP;
} else if (strcmp(argv[2], "GL_REPEAT") == 0) {
swrap = GL_REPEAT;
} else {
Tcl_SetResult(interp, "unknown wrap value", TCL_STATIC);
return TCL_ERROR;
}
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, swrap);
Togl_PostRedisplay(togl);
/* Let result string equal value */
strcpy(interp->result, argv[2]);
return TCL_OK;
}
/*
* Called when T texture coordinate wrapping is changed.
*/
int
twrap_cb(Togl *togl, int argc, CONST84 char *argv[])
{
Tcl_Interp *interp = Togl_Interp(togl);
/* error checking */
if (argc != 3) {
Tcl_SetResult(interp,
"wrong # args: should be \"pathName twrap ?mode?\"",
TCL_STATIC);
return TCL_ERROR;
}
if (strcmp(argv[2], "GL_CLAMP") == 0) {
twrap = GL_CLAMP;
} else if (strcmp(argv[2], "GL_REPEAT") == 0) {
twrap = GL_REPEAT;
} else {
Tcl_SetResult(interp, "unknown wrap value", TCL_STATIC);
return TCL_ERROR;
}
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, twrap);
Togl_PostRedisplay(togl);
/* Let result string equal value */
strcpy(interp->result, argv[2]);
return TCL_OK;
}
/*
* Called when the texture environment mode is changed.
*/
int
envmode_cb(Togl *togl, int argc, CONST84 char *argv[])
{
Tcl_Interp *interp = Togl_Interp(togl);
/* error checking */
if (argc != 3) {
Tcl_SetResult(interp,
"wrong # args: should be \"pathName envmode ?mode?\"",
TCL_STATIC);
return TCL_ERROR;
}
if (strcmp(argv[2], "GL_MODULATE") == 0) {
envmode = GL_MODULATE;
} else if (strcmp(argv[2], "GL_DECAL") == 0) {
envmode = GL_DECAL;
} else if (strcmp(argv[2], "GL_BLEND") == 0) {
envmode = GL_BLEND;
} else {
Tcl_SetResult(interp, "unknown texture env mode", TCL_STATIC);
return TCL_ERROR;
}
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, envmode);
Togl_PostRedisplay(togl);
/* Let result string equal value */
strcpy(interp->result, argv[2]);
return TCL_OK;
}
/*
* Called when the polygon color is changed.
*/
int
polycolor_cb(Togl *togl, int argc, CONST84 char *argv[])
{
Tcl_Interp *interp = Togl_Interp(togl);
/* error checking */
if (argc != 5) {
Tcl_SetResult(interp,
"wrong # args: should be \"pathName polycolor ?r? ?g? ?b?\"",
TCL_STATIC);
return TCL_ERROR;
}
polycolor[0] = atoi(argv[2]);
polycolor[1] = atoi(argv[3]);
polycolor[2] = atoi(argv[4]);
Togl_PostRedisplay(togl);
/* Let result string equal value */
strcpy(interp->result, argv[2]);
return TCL_OK;
}
/*
* Called when the texture image is to be changed
*/
int
image_cb(Togl *togl, int argc, CONST84 char *argv[])
{
Tcl_Interp *interp = Togl_Interp(togl);
/* error checking */
if (argc != 3) {
Tcl_SetResult(interp,
"wrong # args: should be \"pathName image ?name?\"",
TCL_STATIC);
return TCL_ERROR;
}
if (strcmp(argv[2], "CHECKER") == 0) {
texture_image(CHECKER);
} else if (strcmp(argv[2], "FACE") == 0) {
texture_image(FACE);
} else if (strcmp(argv[2], "TREE") == 0) {
texture_image(TREE);
} else {
Tcl_SetResult(interp, "unknown texture image", TCL_STATIC);
return TCL_ERROR;
}
Togl_PostRedisplay(togl);
/* Let result string equal value */
strcpy(interp->result, argv[2]);
return TCL_OK;
}
/*
* Called when the texture coordinate scale is changed.
*/
int
coord_scale_cb(Togl *togl, int argc, CONST84 char *argv[])
{
Tcl_Interp *interp = Togl_Interp(togl);
float s;
/* error checking */
if (argc != 3) {
Tcl_SetResult(interp,
"wrong # args: should be \"pathName coord_scale ?scale?\"",
TCL_STATIC);
return TCL_ERROR;
}
s = atof(argv[2]);
if (s > 0.0 && s < 10.0) {
coord_scale = s;
Togl_PostRedisplay(togl);
}
/* Let result string equal value */
strcpy(interp->result, argv[2]);
return TCL_OK;
}
TOGL_EXTERN int
Texture_Init(Tcl_Interp *interp)
{
/*
* Initialize Tcl, Tk, and the Togl widget module.
*/
#ifdef USE_TCL_STUBS
if (Tcl_InitStubs(interp, "8.1", 0) == NULL) {
return TCL_ERROR;
}
#endif
#ifdef USE_TK_STUBS
if (Tk_InitStubs(interp, "8.1", 0) == NULL) {
return TCL_ERROR;
}
#endif
if (Togl_Init(interp) == TCL_ERROR) {
return TCL_ERROR;
}
/*
* Specify the C callback functions for widget creation, display,
* and reshape.
*/
Togl_CreateFunc(create_cb);
Togl_DisplayFunc(display_cb);
Togl_ReshapeFunc(reshape_cb);
/*
* Make a new Togl widget command so the Tcl code can set a C variable.
*/
Togl_CreateCommand("min_filter", minfilter_cb);
Togl_CreateCommand("mag_filter", magfilter_cb);
Togl_CreateCommand("xrot", xrot_cb);
Togl_CreateCommand("yrot", yrot_cb);
Togl_CreateCommand("scale", scale_cb);
Togl_CreateCommand("swrap", swrap_cb);
Togl_CreateCommand("twrap", twrap_cb);
Togl_CreateCommand("envmode", envmode_cb);
Togl_CreateCommand("polycolor", polycolor_cb);
Togl_CreateCommand("image", image_cb);
Togl_CreateCommand("coord_scale", coord_scale_cb);
/*
* Call Tcl_CreateCommand for application-specific commands, if
* they weren't already created by the init procedures called above.
*/
return TCL_OK;
}
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