glx: indent -br -i3 -npcs --no-tabs single2.c

[mesa.git] / progs / demos / teapot.c

diff --git a/progs/demos/teapot.c b/progs/demos/teapot.c
index 93d1fcba5f7ed3ea4c83ab9754d1e918d5968897..38ede7ac3e16c40fe053f52c38e4480be39faa0c 100644 (file)
--- a/progs/demos/teapot.c
+++ b/progs/demos/teapot.c
@@ -10,14 +10,14 @@
 #include <stdlib.h>
 #include <math.h>
 #include <time.h>
+#include <string.h>
 
 #ifdef WIN32
 #include <windows.h>
 #endif
 
 #include <GL/glut.h>
-#include "../util/readtex.c"
-#include "shadow.c"
+#include "readtex.h"
 
 #ifdef XMESA
 #include "GL/xmesa.h"
@@ -66,6 +66,84 @@ static int joyactive=0;
 static GLuint t1id,t2id;
 static GLuint teapotdlist,basedlist,lightdlist;
 
+
+
+/******************** begin shadow code ********************/
+
+/* Taken from the projshadow.c - by Tom McReynolds, SGI */
+
+/* Modified by David Bucciarelli */
+
+enum {
+  X, Y, Z, W
+};
+enum {
+  A, B, C, D
+};
+
+/* create a matrix that will project the desired shadow */
+void
+shadowmatrix(GLfloat shadowMat[4][4],
+  GLfloat groundplane[4],
+  GLfloat lightpos[4])
+{
+  GLfloat dot;
+
+  /* find dot product between light position vector and ground plane normal */
+  dot = groundplane[X] * lightpos[X] +
+    groundplane[Y] * lightpos[Y] +
+    groundplane[Z] * lightpos[Z] +
+    groundplane[W] * lightpos[W];
+
+  shadowMat[0][0] = dot - lightpos[X] * groundplane[X];
+  shadowMat[1][0] = 0.f - lightpos[X] * groundplane[Y];
+  shadowMat[2][0] = 0.f - lightpos[X] * groundplane[Z];
+  shadowMat[3][0] = 0.f - lightpos[X] * groundplane[W];
+
+  shadowMat[X][1] = 0.f - lightpos[Y] * groundplane[X];
+  shadowMat[1][1] = dot - lightpos[Y] * groundplane[Y];
+  shadowMat[2][1] = 0.f - lightpos[Y] * groundplane[Z];
+  shadowMat[3][1] = 0.f - lightpos[Y] * groundplane[W];
+
+  shadowMat[X][2] = 0.f - lightpos[Z] * groundplane[X];
+  shadowMat[1][2] = 0.f - lightpos[Z] * groundplane[Y];
+  shadowMat[2][2] = dot - lightpos[Z] * groundplane[Z];
+  shadowMat[3][2] = 0.f - lightpos[Z] * groundplane[W];
+
+  shadowMat[X][3] = 0.f - lightpos[W] * groundplane[X];
+  shadowMat[1][3] = 0.f - lightpos[W] * groundplane[Y];
+  shadowMat[2][3] = 0.f - lightpos[W] * groundplane[Z];
+  shadowMat[3][3] = dot - lightpos[W] * groundplane[W];
+
+}
+
+/* find the plane equation given 3 points */
+void
+findplane(GLfloat plane[4],
+  GLfloat v0[3], GLfloat v1[3], GLfloat v2[3])
+{
+  GLfloat vec0[3], vec1[3];
+
+  /* need 2 vectors to find cross product */
+  vec0[X] = v1[X] - v0[X];
+  vec0[Y] = v1[Y] - v0[Y];
+  vec0[Z] = v1[Z] - v0[Z];
+
+  vec1[X] = v2[X] - v0[X];
+  vec1[Y] = v2[Y] - v0[Y];
+  vec1[Z] = v2[Z] - v0[Z];
+
+  /* find cross product to get A, B, and C of plane equation */
+  plane[A] = vec0[Y] * vec1[Z] - vec0[Z] * vec1[Y];
+  plane[B] = -(vec0[X] * vec1[Z] - vec0[Z] * vec1[X]);
+  plane[C] = vec0[X] * vec1[Y] - vec0[Y] * vec1[X];
+
+  plane[D] = -(plane[A] * v0[X] + plane[B] * v0[Y] + plane[C] * v0[Z]);
+}
+
+/******************** end shadow code ********************/
+
+
 static void calcposobs(void)
 {
   dir[0]=sin(alpha*M_PI/180.0);
@@ -172,13 +250,13 @@ static void printhelp(void)
   printstring(GLUT_BITMAP_TIMES_ROMAN_24,"Help");
 
   glRasterPos2i(60,390);
-  printstring(GLUT_BITMAP_TIMES_ROMAN_24,"h - Togle Help");
+  printstring(GLUT_BITMAP_TIMES_ROMAN_24,"h - Toggle Help");
   glRasterPos2i(60,360);
-  printstring(GLUT_BITMAP_TIMES_ROMAN_24,"t - Togle Textures");
+  printstring(GLUT_BITMAP_TIMES_ROMAN_24,"t - Toggle Textures");
   glRasterPos2i(60,330);
-  printstring(GLUT_BITMAP_TIMES_ROMAN_24,"f - Togle Fog");
+  printstring(GLUT_BITMAP_TIMES_ROMAN_24,"f - Toggle Fog");
   glRasterPos2i(60,300);
-  printstring(GLUT_BITMAP_TIMES_ROMAN_24,"b - Togle Back face culling");
+  printstring(GLUT_BITMAP_TIMES_ROMAN_24,"b - Toggle Back face culling");
   glRasterPos2i(60,270);
   printstring(GLUT_BITMAP_TIMES_ROMAN_24,"Arrow Keys - Rotate");
   glRasterPos2i(60,240);
@@ -188,7 +266,7 @@ static void printhelp(void)
 
   glRasterPos2i(60,180);
   if(joyavailable)
-    printstring(GLUT_BITMAP_TIMES_ROMAN_24,"j - Togle jostick control (Joystick control available)");
+    printstring(GLUT_BITMAP_TIMES_ROMAN_24,"j - Toggle jostick control (Joystick control available)");
   else
     printstring(GLUT_BITMAP_TIMES_ROMAN_24,"(No Joystick control available)");
 }