68630d6782
This included half the game state and lots of unneeded parts of the software renderer. The two modules that are shared between softpoly and the classic software renderer have been moved to a neutral place.
128 lines
4.3 KiB
C++
128 lines
4.3 KiB
C++
/*
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** Polygon Doom software renderer
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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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#pragma once
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#include <cstdint>
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#include <vector>
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#include "renderstyle.h"
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//#include "rendering/swrenderer/drawers/r_draw.h"
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class FString;
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class PolyTriangleThreadData;
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struct ScreenTriVertex
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{
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float x, y, z, w;
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float u, v;
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float worldX, worldY, worldZ;
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float a, r, g, b;
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float gradientdistZ;
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};
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struct ScreenTriangleStepVariables
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{
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float W, U, V;
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float WorldX, WorldY, WorldZ;
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float A, R, G, B;
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float GradientdistZ;
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};
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struct TriDrawTriangleArgs
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{
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ScreenTriVertex *v1;
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ScreenTriVertex *v2;
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ScreenTriVertex *v3;
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ScreenTriangleStepVariables gradientX;
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ScreenTriangleStepVariables gradientY;
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bool CalculateGradients()
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{
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float bottomX = (v2->x - v3->x) * (v1->y - v3->y) - (v1->x - v3->x) * (v2->y - v3->y);
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float bottomY = (v1->x - v3->x) * (v2->y - v3->y) - (v2->x - v3->x) * (v1->y - v3->y);
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if ((bottomX >= -FLT_EPSILON && bottomX <= FLT_EPSILON) || (bottomY >= -FLT_EPSILON && bottomY <= FLT_EPSILON))
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return false;
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gradientX.W = FindGradientX(bottomX, 1.0f, 1.0f, 1.0f);
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gradientX.U = FindGradientX(bottomX, v1->u, v2->u, v3->u);
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gradientX.V = FindGradientX(bottomX, v1->v, v2->v, v3->v);
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gradientX.WorldX = FindGradientX(bottomX, v1->worldX, v2->worldX, v3->worldX);
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gradientX.WorldY = FindGradientX(bottomX, v1->worldY, v2->worldY, v3->worldY);
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gradientX.WorldZ = FindGradientX(bottomX, v1->worldZ, v2->worldZ, v3->worldZ);
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gradientX.A = FindGradientX(bottomX, v1->a, v2->a, v3->a);
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gradientX.R = FindGradientX(bottomX, v1->r, v2->r, v3->r);
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gradientX.G = FindGradientX(bottomX, v1->g, v2->g, v3->g);
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gradientX.B = FindGradientX(bottomX, v1->b, v2->b, v3->b);
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gradientX.GradientdistZ = FindGradientX(bottomX, v1->gradientdistZ, v2->gradientdistZ, v3->gradientdistZ);
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gradientY.W = FindGradientY(bottomY, 1.0f, 1.0f, 1.0f);
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gradientY.U = FindGradientY(bottomY, v1->u, v2->u, v3->u);
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gradientY.V = FindGradientY(bottomY, v1->v, v2->v, v3->v);
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gradientY.WorldX = FindGradientY(bottomY, v1->worldX, v2->worldX, v3->worldX);
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gradientY.WorldY = FindGradientY(bottomY, v1->worldY, v2->worldY, v3->worldY);
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gradientY.WorldZ = FindGradientY(bottomY, v1->worldZ, v2->worldZ, v3->worldZ);
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gradientY.A = FindGradientY(bottomY, v1->a, v2->a, v3->a);
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gradientY.R = FindGradientY(bottomY, v1->r, v2->r, v3->r);
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gradientY.G = FindGradientY(bottomY, v1->g, v2->g, v3->g);
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gradientY.B = FindGradientY(bottomY, v1->b, v2->b, v3->b);
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gradientY.GradientdistZ = FindGradientY(bottomY, v1->gradientdistZ, v2->gradientdistZ, v3->gradientdistZ);
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return true;
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}
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private:
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float FindGradientX(float bottomX, float c0, float c1, float c2)
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{
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c0 *= v1->w;
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c1 *= v2->w;
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c2 *= v3->w;
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return ((c1 - c2) * (v1->y - v3->y) - (c0 - c2) * (v2->y - v3->y)) / bottomX;
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}
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float FindGradientY(float bottomY, float c0, float c1, float c2)
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{
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c0 *= v1->w;
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c1 *= v2->w;
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c2 *= v3->w;
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return ((c1 - c2) * (v1->x - v3->x) - (c0 - c2) * (v2->x - v3->x)) / bottomY;
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}
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};
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class ScreenTriangle
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{
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public:
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static void Draw(const TriDrawTriangleArgs* args, PolyTriangleThreadData* thread);
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private:
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static void(*TestSpanOpts[])(int y, int x0, int x1, const TriDrawTriangleArgs* args, PolyTriangleThreadData* thread);
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};
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enum SWTestSpan
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{
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SWTRI_DepthTest = 1,
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SWTRI_StencilTest = 2
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};
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struct TestSpanOpt0 { static const int Flags = 0; };
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struct TestSpanOpt1 { static const int Flags = 1; };
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struct TestSpanOpt2 { static const int Flags = 2; };
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struct TestSpanOpt3 { static const int Flags = 3; };
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