96 lines
3.2 KiB
C++
96 lines
3.2 KiB
C++
/*
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** Triangle drawers
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** Copyright (c) 2016 Magnus Norddahl
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**
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** This software is provided 'as-is', without any express or implied
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** warranty. In no event will the authors be held liable for any damages
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** arising from the use of this software.
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**
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** Permission is granted to anyone to use this software for any purpose,
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** including commercial applications, and to alter it and redistribute it
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** freely, subject to the following restrictions:
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**
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** 1. The origin of this software must not be misrepresented; you must not
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** claim that you wrote the original software. If you use this software
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** in a product, an acknowledgment in the product documentation would be
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** appreciated but is not required.
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** 2. Altered source versions must be plainly marked as such, and must not be
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** misrepresented as being the original software.
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** 3. This notice may not be removed or altered from any source distribution.
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**
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*/
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#ifndef __R_TRIANGLE__
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#define __R_TRIANGLE__
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#include "r_draw.h"
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class FTexture;
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struct ScreenTriangleDrawerArgs;
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struct TriVertex
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{
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TriVertex() { }
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TriVertex(float x, float y, float z, float w, float u, float v, float light) : x(x), y(y), z(z), w(w) { varying[0] = u; varying[1] = v; varying[2] = light; }
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enum { NumVarying = 3 };
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float x, y, z, w;
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float varying[NumVarying];
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};
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struct TriMatrix
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{
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static TriMatrix null();
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static TriMatrix identity();
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static TriMatrix translate(float x, float y, float z);
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static TriMatrix scale(float x, float y, float z);
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static TriMatrix rotate(float angle, float x, float y, float z);
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TriVertex operator*(TriVertex v) const;
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TriMatrix operator*(const TriMatrix &m) const;
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float matrix[16];
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};
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class TriangleDrawer
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{
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public:
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static void draw(const TriMatrix &objectToWorld, const TriVertex *vinput, int vcount, bool ccw, int clipleft, int clipright, const short *cliptop, const short *clipbottom, FTexture *texture);
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static void fill(const TriMatrix &objectToWorld, const TriVertex *vinput, int vcount, bool ccw, int clipleft, int clipright, const short *cliptop, const short *clipbottom, int solidcolor);
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private:
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static void draw_any(const TriMatrix &objectToWorld, const TriVertex *vinput, int vcount, bool ccw, int clipleft, int clipright, const short *cliptop, const short *clipbottom, FTexture *texture, int solidcolor, void(*drawfunc)(const ScreenTriangleDrawerArgs *));
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static bool cullhalfspace(float clipdistance1, float clipdistance2, float &t1, float &t2);
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static void clipedge(const TriVertex &v1, const TriVertex &v2, TriVertex *clippedvert, int &numclipvert);
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};
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struct ScreenTriangleDrawerArgs
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{
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uint8_t *dest;
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int pitch;
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TriVertex *v1;
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TriVertex *v2;
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TriVertex *v3;
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int clipleft;
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int clipright;
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const short *cliptop;
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const short *clipbottom;
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const uint8_t *texturePixels;
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int textureWidth;
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int textureHeight;
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int solidcolor;
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};
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class ScreenTriangleDrawer
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{
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public:
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static void draw(const ScreenTriangleDrawerArgs *args);
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static void fill(const ScreenTriangleDrawerArgs *args);
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private:
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static float gradx(float x0, float y0, float x1, float y1, float x2, float y2, float c0, float c1, float c2);
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static float grady(float x0, float y0, float x1, float y1, float x2, float y2, float c0, float c1, float c2);
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};
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#endif
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