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344 lines
8.1 KiB
C
344 lines
8.1 KiB
C
/* $Id: stereo.c,v 1.14 2009/02/07 07:04:50 gregcouch Exp $ */
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/*
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* Togl - a Tk OpenGL widget
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* Copyright (C) 1996-1997 Brian Paul and Ben Bederson
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* Copyright (C) 2006-2009 Greg Couch
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* See the LICENSE file for copyright details.
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*/
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#define USE_TOGL_STUBS
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#include "togl.h"
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#include <stdlib.h>
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#include <string.h>
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#undef TCL_STORAGE_CLASS
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#define TCL_STORAGE_CLASS DLLEXPORT
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static Tcl_Obj *toglFont;
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static double xAngle = 0, yAngle = 0, zAngle = 0;
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static GLfloat CornerX, CornerY, CornerZ; /* where to print strings */
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static double coord_scale = 1;
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/*
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* Togl widget create callback. This is called by Tcl/Tk when the widget has
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* been realized. Here's where one may do some one-time context setup or
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* initializations.
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*/
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static int
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create_cb(ClientData clientData, Tcl_Interp *interp, int objc,
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Tcl_Obj *const *objv)
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{
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Togl *togl;
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if (objc != 2) {
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Tcl_WrongNumArgs(interp, 1, objv, "pathName");
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return TCL_ERROR;
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}
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if (Togl_GetToglFromObj(interp, objv[1], &togl) != TCL_OK) {
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return TCL_ERROR;
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}
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return TCL_OK;
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}
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/*
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* Togl widget reshape callback. This is called by Tcl/Tk when the widget
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* has been resized. Typically, we call glViewport and perhaps setup the
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* projection matrix.
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*/
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static int
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reshape_cb(ClientData clientData, Tcl_Interp *interp, int objc,
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Tcl_Obj *const *objv)
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{
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int width;
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int height;
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float aspect;
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Togl *togl;
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if (objc != 2) {
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Tcl_WrongNumArgs(interp, 1, objv, "pathName");
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return TCL_ERROR;
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}
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if (Togl_GetToglFromObj(interp, objv[1], &togl) != TCL_OK) {
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return TCL_ERROR;
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}
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width = Togl_Width(togl);
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height = Togl_Height(togl);
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aspect = (float) width / (float) height;
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glViewport(0, 0, width, height);
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/* Set up projection transform */
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glFrustum(-aspect, aspect, -1, 1, 1, 10);
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CornerX = -aspect;
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CornerY = -1;
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CornerZ = -1.1f;
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/* Change back to model view transform for rendering */
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glMatrixMode(GL_MODELVIEW);
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return TCL_OK;
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}
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static void
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draw_eye(Togl *togl)
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{
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static GLuint cubeList = 0;
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Togl_Clear(togl, GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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Togl_Frustum(togl, -1, 1, -1, 1, 1, 10);
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glMatrixMode(GL_MODELVIEW);
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if (!cubeList) {
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cubeList = glGenLists(1);
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glNewList(cubeList, GL_COMPILE);
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/* Front face */
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glBegin(GL_QUADS);
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glColor3f(0.4f, 0.8f, 0.4f); /* Green-ish */
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glVertex3f(-1, 1, 1);
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glVertex3f(1, 1, 1);
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glVertex3f(1, -1, 1);
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glVertex3f(-1, -1, 1);
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/* Back face */
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glColor3f(0.8f, 0.8f, 0.4f); /* Yellow-ish */
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glVertex3f(-1, 1, -1);
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glVertex3f(1, 1, -1);
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glVertex3f(1, -1, -1);
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glVertex3f(-1, -1, -1);
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/* Top side face */
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glColor3f(0.4f, 0.4f, 0.8f); /* Blue-ish */
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glVertex3f(-1, 1, 1);
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glVertex3f(1, 1, 1);
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glVertex3f(1, 1, -1);
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glVertex3f(-1, 1, -1);
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/* Bottom side face */
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glColor3f(0.8f, 0.4f, 0.4f); /* Red-ish */
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glVertex3f(-1, -1, 1);
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glVertex3f(1, -1, 1);
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glVertex3f(1, -1, -1);
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glVertex3f(-1, -1, -1);
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glEnd();
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glEndList();
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}
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glCallList(cubeList);
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}
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/*
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* Togl widget display callback. This is called by Tcl/Tk when the widget's
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* contents have to be redrawn. Typically, we clear the color and depth
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* buffers, render our objects, then swap the front/back color buffers.
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*/
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static int
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display_cb(ClientData clientData, Tcl_Interp *interp, int objc,
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Tcl_Obj *const *objv)
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{
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Togl *togl;
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if (objc != 2) {
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Tcl_WrongNumArgs(interp, 1, objv, "pathName");
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return TCL_ERROR;
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}
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if (Togl_GetToglFromObj(interp, objv[1], &togl) != TCL_OK) {
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return TCL_ERROR;
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}
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/* setup modelview matrix */
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glLoadIdentity(); /* Reset modelview matrix to the identity
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* matrix */
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glTranslatef(0, 0, -3.0); /* Move the camera back three units */
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glScaled(coord_scale, coord_scale, coord_scale); /* Zoom in and out */
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glRotated(xAngle, 1, 0, 0); /* Rotate by X, Y, and Z angles */
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glRotated(yAngle, 0, 1, 0);
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glRotated(zAngle, 0, 0, 1);
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glEnable(GL_DEPTH_TEST);
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if (Togl_NumEyes(togl) == 1) {
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/* single eye */
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Togl_DrawBuffer(togl, GL_BACK);
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draw_eye(togl);
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} else {
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/* stereo left eye */
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Togl_DrawBuffer(togl, GL_BACK_LEFT);
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draw_eye(togl);
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/* stereo right eye */
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Togl_DrawBuffer(togl, GL_BACK_RIGHT);
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draw_eye(togl);
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}
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glDisable(GL_DEPTH_TEST);
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glLoadIdentity();
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glColor3f(1, 1, 1);
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glRasterPos3f(CornerX, CornerY, CornerZ);
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Togl_SwapBuffers(togl);
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return TCL_OK;
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}
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static int
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setXrot_cb(ClientData clientData, Tcl_Interp *interp, int objc,
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Tcl_Obj *const *objv)
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{
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Togl *togl;
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if (objc != 3) {
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Tcl_WrongNumArgs(interp, 1, objv, "pathName angle");
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return TCL_ERROR;
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}
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if (Togl_GetToglFromObj(interp, objv[1], &togl) != TCL_OK) {
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return TCL_ERROR;
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}
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if (Tcl_GetDoubleFromObj(interp, objv[2], &xAngle) != TCL_OK) {
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return TCL_ERROR;
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}
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/* printf( "before %f ", xAngle ); */
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if (xAngle < 0) {
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xAngle += 360;
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} else if (xAngle > 360) {
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xAngle -= 360;
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}
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/* printf( "after %f \n", xAngle ); */
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Togl_PostRedisplay(togl);
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/* Let result string equal value */
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Tcl_SetObjResult(interp, objv[2]);
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return TCL_OK;
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}
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static int
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setYrot_cb(ClientData clientData, Tcl_Interp *interp, int objc,
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Tcl_Obj *const *objv)
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{
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Togl *togl;
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if (objc != 3) {
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Tcl_WrongNumArgs(interp, 1, objv, "pathName angle");
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return TCL_ERROR;
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}
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if (Togl_GetToglFromObj(interp, objv[1], &togl) != TCL_OK) {
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return TCL_ERROR;
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}
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if (Tcl_GetDoubleFromObj(interp, objv[2], &yAngle) != TCL_OK) {
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return TCL_ERROR;
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}
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if (yAngle < 0) {
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yAngle += 360;
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} else if (yAngle > 360) {
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yAngle -= 360;
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}
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Togl_PostRedisplay(togl);
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/* Let result string equal value */
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Tcl_SetObjResult(interp, objv[2]);
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return TCL_OK;
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}
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int
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getXrot_cb(ClientData clientData, Tcl_Interp *interp,
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int argc, CONST84 char *argv[])
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{
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Tcl_SetObjResult(interp, Tcl_NewDoubleObj(xAngle));
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return TCL_OK;
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}
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int
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getYrot_cb(ClientData clientData, Tcl_Interp *interp,
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int argc, CONST84 char *argv[])
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{
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Tcl_SetObjResult(interp, Tcl_NewDoubleObj(yAngle));
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return TCL_OK;
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}
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static int
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coord_scale_cb(ClientData clientData, Tcl_Interp *interp, int objc,
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Tcl_Obj *const *objv)
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{
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Togl *togl;
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if (objc != 3) {
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Tcl_WrongNumArgs(interp, 1, objv, "pathName value");
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return TCL_ERROR;
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}
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if (Togl_GetToglFromObj(interp, objv[1], &togl) != TCL_OK) {
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return TCL_ERROR;
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}
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if (Tcl_GetDoubleFromObj(interp, objv[2], &coord_scale) != TCL_OK) {
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return TCL_ERROR;
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}
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Togl_PostRedisplay(togl);
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/* Let result string equal value */
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Tcl_SetObjResult(interp, objv[2]);
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return TCL_OK;
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}
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EXTERN int
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Stereo_Init(Tcl_Interp *interp)
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{
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/*
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* Initialize Tcl and the Togl widget module.
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*/
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if (Tcl_InitStubs(interp, "8.1", 0) == NULL
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|| Togl_InitStubs(interp, "2.0", 0) == NULL) {
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return TCL_ERROR;
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}
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/*
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* Specify the C callback functions for widget creation, display,
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* and reshape.
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*/
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Tcl_CreateObjCommand(interp, "create_cb", create_cb, NULL, NULL);
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Tcl_CreateObjCommand(interp, "display_cb", display_cb, NULL, NULL);
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Tcl_CreateObjCommand(interp, "reshape_cb", reshape_cb, NULL, NULL);
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Tcl_CreateObjCommand(interp, "setXrot", setXrot_cb, NULL, NULL);
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Tcl_CreateObjCommand(interp, "setYrot", setYrot_cb, NULL, NULL);
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Tcl_CreateObjCommand(interp, "coord_scale", coord_scale_cb, NULL, NULL);
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/*
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* Call Tcl_CreateCommand for application-specific commands, if
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* they weren't already created by the init procedures called above.
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*/
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Tcl_CreateCommand(interp, "getXrot", getXrot_cb, NULL, NULL);
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Tcl_CreateCommand(interp, "getYrot", getYrot_cb, NULL, NULL);
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return TCL_OK;
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}
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