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/* $Id: index.c,v 1.1 2012/10/24 22:52:31 mgltools Exp $ */
/*
* Togl - a Tk OpenGL widget
* Copyright (C) 1996-1997 Brian Paul and Ben Bederson
* Copyright (C) 2006-2007 Greg Couch
* See the LICENSE file for copyright details.
*/
/*
* An example Togl program using color-index mode.
*/
#define USE_TOGL_STUBS
#include "togl.h"
#include <stdlib.h>
#include <string.h>
#undef TCL_STORAGE_CLASS
#define TCL_STORAGE_CLASS DLLEXPORT
/* Our color indexes: */
static unsigned long black, red, green, blue;
/* Rotation angle */
static float Angle = 0;
/*
* 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.
*/
static int
create_cb(ClientData clientData, Tcl_Interp *interp, int objc,
Tcl_Obj *const *objv)
{
Togl *togl;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "pathName");
return TCL_ERROR;
}
if (Togl_GetToglFromObj(interp, objv[1], &togl) != TCL_OK) {
return TCL_ERROR;
}
/* allocate color indexes */
black = Togl_AllocColor(togl, 0, 0, 0);
red = Togl_AllocColor(togl, 1, 0, 0);
green = Togl_AllocColor(togl, 0, 1, 0);
blue = Togl_AllocColor(togl, 0, 0, 1);
/* If we were using a private read/write colormap we'd setup our color
* table with something like this: */
/*
* black = 1; Togl_SetColor( togl, black, 0, 0, 0 ); red = 2;
* Togl_SetColor( togl, red, 1, 0, 0 ); green = 3; Togl_SetColor(
* togl, green, 0, 1, 0 ); blue = 4; Togl_SetColor( togl, blue, 0,
* 0, 1 ); */
glShadeModel(GL_FLAT);
glDisable(GL_DITHER);
return TCL_OK;
}
/*
* 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.
*/
static int
reshape_cb(ClientData clientData, Tcl_Interp *interp, int objc,
Tcl_Obj *const *objv)
{
int width;
int height;
float aspect;
Togl *togl;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "pathName");
return TCL_ERROR;
}
if (Togl_GetToglFromObj(interp, objv[1], &togl) != TCL_OK) {
return TCL_ERROR;
}
width = Togl_Width(togl);
height = Togl_Height(togl);
aspect = (float) width / (float) height;
glViewport(0, 0, width, height);
/* Set up projection transform */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-aspect, aspect, -1, 1, -1, 1);
/* Change back to model view transform for rendering */
glMatrixMode(GL_MODELVIEW);
return TCL_OK;
}
/*
* 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.
*/
static int
display_cb(ClientData clientData, Tcl_Interp *interp, int objc,
Tcl_Obj *const *objv)
{
Togl *togl;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "pathName");
return TCL_ERROR;
}
if (Togl_GetToglFromObj(interp, objv[1], &togl) != TCL_OK) {
return TCL_ERROR;
}
glClearIndex((float) black);
glClear(GL_COLOR_BUFFER_BIT);
glPushMatrix();
glTranslatef(0.3f, -0.3f, 0);
glRotatef(Angle, 0, 0, 1);
glIndexi(red);
glBegin(GL_TRIANGLES);
glVertex2f(-0.5f, -0.3f);
glVertex2f(0.5f, -0.3f);
glVertex2f(0, 0.6f);
glEnd();
glPopMatrix();
glPushMatrix();
glRotatef(Angle, 0, 0, 1);
glIndexi(green);
glBegin(GL_TRIANGLES);
glVertex2f(-0.5f, -0.3f);
glVertex2f(0.5f, -0.3f);
glVertex2f(0, 0.6f);
glEnd();
glPopMatrix();
glPushMatrix();
glTranslatef(-0.3f, 0.3f, 0);
glRotatef(Angle, 0, 0, 1);
glIndexi(blue);
glBegin(GL_TRIANGLES);
glVertex2f(-0.5f, -0.3f);
glVertex2f(0.5f, -0.3f);
glVertex2f(0, 0.6f);
glEnd();
glPopMatrix();
glFlush();
Togl_SwapBuffers(togl);
return TCL_OK;
}
static int
timer_cb(ClientData clientData, Tcl_Interp *interp, int objc,
Tcl_Obj *const *objv)
{
Togl *togl;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "pathName");
return TCL_ERROR;
}
if (Togl_GetToglFromObj(interp, objv[1], &togl) != TCL_OK) {
return TCL_ERROR;
}
Angle += 5.0;
Togl_PostRedisplay(togl);
return TCL_OK;
}
EXTERN int
Index_Init(Tcl_Interp *interp)
{
/*
* Initialize Tcl and the Togl widget module.
*/
if (Tcl_InitStubs(interp, "8.1", 0) == NULL
|| Togl_InitStubs(interp, "2.0", 0) == NULL) {
return TCL_ERROR;
}
/*
* Specify the C callback functions for widget creation, display,
* and reshape.
*/
Tcl_CreateObjCommand(interp, "::index::create_cb", create_cb, NULL, NULL);
Tcl_CreateObjCommand(interp, "::index::display_cb", display_cb, NULL, NULL);
Tcl_CreateObjCommand(interp, "::index::reshape_cb", reshape_cb, NULL, NULL);
Tcl_CreateObjCommand(interp, "::index::timer_cb", timer_cb, NULL, NULL);
/*
* Make a new Togl widget command so the Tcl code can set a C variable.
*/
/* NONE */
/*
* 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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