forked from dolphin-emu/dolphin
81 lines
1.7 KiB
C
81 lines
1.7 KiB
C
// Copyright 2009 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#pragma once
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#include "Common/CommonTypes.h"
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#include "VideoBackends/Software/Vec3.h"
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struct Vec4
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{
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float x;
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float y;
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float z;
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float w;
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};
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struct InputVertexData
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{
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u8 posMtx;
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u8 texMtx[8];
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Vec3 position;
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Vec3 normal[3];
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u8 color[2][4];
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float texCoords[8][2];
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};
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struct OutputVertexData
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{
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// components in color channels
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enum
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{
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RED_C,
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GRN_C,
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BLU_C,
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ALP_C
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};
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Vec3 mvPosition = {};
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Vec4 projectedPosition = {};
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Vec3 screenPosition = {};
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Vec3 normal[3] = {};
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u8 color[2][4] = {};
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Vec3 texCoords[8] = {};
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void Lerp(float t, const OutputVertexData* a, const OutputVertexData* b)
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{
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#define LINTERP(T, OUT, IN) (OUT) + ((IN - OUT) * T)
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#define LINTERP_INT(T, OUT, IN) (OUT) + (((IN - OUT) * T) >> 8)
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mvPosition = LINTERP(t, a->mvPosition, b->mvPosition);
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projectedPosition.x = LINTERP(t, a->projectedPosition.x, b->projectedPosition.x);
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projectedPosition.y = LINTERP(t, a->projectedPosition.y, b->projectedPosition.y);
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projectedPosition.z = LINTERP(t, a->projectedPosition.z, b->projectedPosition.z);
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projectedPosition.w = LINTERP(t, a->projectedPosition.w, b->projectedPosition.w);
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for (int i = 0; i < 3; ++i)
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{
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normal[i] = LINTERP(t, a->normal[i], b->normal[i]);
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}
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u16 t_int = (u16)(t * 256);
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for (int i = 0; i < 4; ++i)
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{
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color[0][i] = LINTERP_INT(t_int, a->color[0][i], b->color[0][i]);
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color[1][i] = LINTERP_INT(t_int, a->color[1][i], b->color[1][i]);
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}
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for (int i = 0; i < 8; ++i)
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{
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texCoords[i] = LINTERP(t, a->texCoords[i], b->texCoords[i]);
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}
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#undef LINTERP
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#undef LINTERP_INT
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}
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};
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