mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-26 22:51:01 +00:00
285 lines
6.2 KiB
C
285 lines
6.2 KiB
C
/*
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Copyright 2014 Wolfgang Thaller.
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This file is part of Retro68.
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Retro68 is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Retro68 is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Retro68. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef __APPLE__
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#include <Carbon/Carbon.h>
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#include <ApplicationServices/ApplicationServices.h>
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#else
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#ifdef TARGET_API_MAC_CARBON
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#include <math.h>
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#include <Carbon.h>
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#else
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#include <Quickdraw.h>
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#include <MacMemory.h>
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#include <Sound.h>
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#include <Events.h>
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#include <Fonts.h>
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#include <NumberFormatting.h>
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#endif
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#endif
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#include <math.h>
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#include <stdbool.h>
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#include <stdlib.h>
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pascal /* <- pascal calling convention, for no reason in particular except to test the comppiler */
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bool hitSphere(float x0, float y0, float z0, float dx, float dy, float dz, float *t)
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{
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const float xc = 0.0f, yc = 0.0f, zc = -6.0f, r = 1.0f;
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float x0c = x0 - xc;
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float y0c = y0 - yc;
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float z0c = z0 - zc;
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/*
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(x-xc)^2 + (y-yc)^2 + (z-zc)^2 = r^2;
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(x0c + dx * t)^2 + (y0c + dy * t)^2 + (z0c + dz * t)^2 = r^2;
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x0c^2 + 2*x0c*dx*t + dx^2*t^2 + y0c^2 + 2*y0c*dy*t + dy^2*t^2 + z0c^2 + 2 * z0c*dz*t + dz^2*t^2 = r^2
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(dx^2 + dy^2 + dz^2)*t^2 + (2*x0c*dx + 2*y0c&dy + 2*z0c*dz) * t + x0c^2+y0c^2+z0c^2-r^2
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*/
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float a = dx*dx + dy*dy + dz*dz;
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float b = 2*(x0c*dx + y0c*dy + z0c*dz);
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float c = x0c*x0c + y0c*y0c + z0c*z0c -r*r;
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float D = b*b - 4 * a * c;
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if(D >= 0)
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{
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*t = (-b - sqrtf(D)) / (2*a);
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return *t >= 0;
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}
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return false;
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}
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const float lx = -2, ly = 4, lz = 3;
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float lenl;
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float lxn, lyn, lzn;
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float ray(int n, float x0, float y0, float z0, float dx, float dy, float dz)
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{
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{
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const float xc = 0.0f, yc = 0.0f, zc = -6.0f, r = 1.0f;
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float x0c = x0 - xc;
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float y0c = y0 - yc;
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float z0c = z0 - zc;
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/*
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(x-xc)^2 + (y-yc)^2 + (z-zc)^2 = r^2;
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(x0c + dx * t)^2 + (y0c + dy * t)^2 + (z0c + dz * t)^2 = r^2;
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x0c^2 + 2*x0c*dx*t + dx^2*t^2 + y0c^2 + 2*y0c*dy*t + dy^2*t^2 + z0c^2 + 2 * z0c*dz*t + dz^2*t^2 = r^2
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(dx^2 + dy^2 + dz^2)*t^2 + (2*x0c*dx + 2*y0c&dy + 2*z0c*dz) * t + x0c^2+y0c^2+z0c^2-r^2
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*/
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float a = dx*dx + dy*dy + dz*dz;
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float b = 2*(x0c*dx + y0c*dy + z0c*dz);
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float c = x0c*x0c + y0c*y0c + z0c*z0c -r*r;
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float D = b*b - 4 * a * c;
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if(D >= 0)
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{
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float t = (-b - sqrtf(D)) / (2*a);
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if(t > 0)
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{
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float x = x0 + dx * t;
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float y = y0 + dy * t;
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float z = z0 + dz * t;
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float dx2 = x - xc;
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float dy2 = y - yc;
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float dz2 = z - zc;
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float l = dx2 * dx + dy2 * dy + dz2 * dz;
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l *= 2;
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float reflected;
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if(n)
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reflected = ray(n-1, x,y,z, dx - l*dx2, dy - l*dy2, dz - l*dz2);
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else
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reflected = 0.0f;
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float lambert = dx2 * lxn + dy2 * lyn + dz2 * lzn;
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if(lambert < 0.0f)
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lambert = 0.0f;
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return 0.2f + 0.4f * lambert + 0.4f * reflected;
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}
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}
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}
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if(dy < 0)
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{
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float t = (-1.5f - y0) / dy;
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float x = x0 + dx * t;
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float z = z0 + dz * t;
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float color;
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if( ((int)( floorf(x) )
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+ (int)( floorf(z) )) % 2 )
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color = 0.8f;
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else
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color = 0.1f;
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float ts;
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if(hitSphere(x,-1.5f,z, lxn, lyn, lzn, &ts))
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color *= 0.2f;
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float v = color + 0.5f * ray(n-1, x,-1.5f,z,dx,-dy,dz);
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if(v > 1.0f)
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return 1.0f;
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else
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return v;
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}
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float v = dy * 0.3f;
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if(v < 0.0f)
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return 0.0f;
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else
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return v;
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}
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int main()
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{
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WindowPtr win;
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#if !TARGET_API_MAC_CARBON
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InitGraf(&qd.thePort);
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InitFonts();
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InitWindows();
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InitMenus();
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Rect r = qd.screenBits.bounds;
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#else
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BitMap bm;
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GetQDGlobalsScreenBits(&bm);
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Rect r = bm.bounds;
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#endif
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SetRect(&r, r.left + 5, r.top + 45, r.right - 5, r.bottom -5);
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win = NewWindow(NULL, &r, "\pRaytracer (C Version)", true, 0, (WindowPtr)-1, false, 0);
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#if !TARGET_API_MAC_CARBON
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SetPort(win);
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r = win->portRect;
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#else
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SetPortWindowPort(win);
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GetPortBounds(GetWindowPort(win), &r);
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#endif
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EraseRect(&r);
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float accum = 0.0f;
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short cx = r.right /2;
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short cy = r.bottom / 2;
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int x,y;
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lenl = 1.0f / sqrtf(lx*lx + ly*ly + lz*lz);
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lxn = lx*lenl, lyn = ly*lenl, lzn = lz*lenl;
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long startTime = TickCount();
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float *accumV = (float*)NewPtrClear(sizeof(float) * r.right);
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for(y = 0; y < r.bottom; y++)
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{
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for(x = 0; x < r.right; x++)
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{
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float pixel;
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// cam = (0,0,0)
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// ray = t * (x-r.right/2, - (y-r.bottom/2), -1)
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// plane: y = -2
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float dx = x - cx;
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float dy = - (y - cy);
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float dz = -cx;
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float n1 = 1.0f / sqrtf(dx*dx + dy*dy + dz*dz);
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pixel = ray(1,0,0,0,n1*dx,n1*dy,n1*dz);
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#if 0
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accum += pixel;
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if(accum >= 0.5f)
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accum -= 1.0f;
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else
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{
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MoveTo(x,y);
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Line(0,0);
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}
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#elif 0
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accum += pixel;
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accum += accumV[x];
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if(accum >= 0.5f)
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accum -= 1.0f;
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else
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{
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MoveTo(x,y);
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Line(0,0);
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}
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accumV[x] = accum = accum / 2;
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#elif 0
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//if(pixel < Random() / 32767.0)
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if(pixel < (float)std::rand() / (32767.0f * 65536.0f))
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{
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MoveTo(x,y);
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Line(0,0);
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}
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#else
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float thresh = (float)rand() / (32767.0f * 65536.0f);
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thresh = 0.5f + 0.4f * (thresh - 0.5f);
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accum += pixel;
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accum += accumV[x];
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if(accum >= thresh)
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accum -= 1.0f;
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else
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{
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MoveTo(x,y);
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Line(0,0);
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}
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accumV[x] = accum = accum / 2;
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#endif
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}
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if(Button())
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return 0;
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#if TARGET_API_MAC_CARBON
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QDFlushPortBuffer(GetWindowPort(win),NULL);
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#endif
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}
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long endTime = TickCount();
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Str255 pstr;
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NumToString( (long)( (float)r.right * r.bottom / (endTime - startTime) * 60.0f ),
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pstr );
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SetRect(&r, 10, 10, 10 + StringWidth("\ppps = ") + StringWidth(pstr) + 10, 30);
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PaintRect(&r);
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PenMode(patXor);
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FrameRect(&r);
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MoveTo(15,25);
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TextMode(srcBic);
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DrawString("\ppps = ");
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DrawString(pstr);
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#if TARGET_API_MAC_CARBON
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QDFlushPortBuffer(GetWindowPort(win),NULL);
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#endif
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while(!Button())
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;
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FlushEvents(everyEvent, -1);
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return 0;
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}
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