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Rubberduckycooly
GitHub Repository: Rubberduckycooly/RSDKv5-Decompilation
 Path: blob/master/RSDKv5/RSDK/Graphics/Legacy/Scene3DLegacy.cpp
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#include "v3/Scene3DLegacyv3.cpp"

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#include "v4/Scene3DLegacyv4.cpp"

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int32 RSDK::Legacy::vertexCount = 0;

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int32 RSDK::Legacy::faceCount   = 0;

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RSDK::Legacy::Matrix RSDK::Legacy::matFinal;

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RSDK::Legacy::Matrix RSDK::Legacy::matWorld;

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RSDK::Legacy::Matrix RSDK::Legacy::matView;

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RSDK::Legacy::Matrix RSDK::Legacy::matTemp;

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int32 RSDK::Legacy::projectionX = 136;

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int32 RSDK::Legacy::projectionY = 160;

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int32 RSDK::Legacy::faceLineStart[SCREEN_YSIZE];

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int32 RSDK::Legacy::faceLineEnd[SCREEN_YSIZE];

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int32 RSDK::Legacy::faceLineStartU[SCREEN_YSIZE];

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int32 RSDK::Legacy::faceLineEndU[SCREEN_YSIZE];

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int32 RSDK::Legacy::faceLineStartV[SCREEN_YSIZE];

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int32 RSDK::Legacy::faceLineEndV[SCREEN_YSIZE];

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void RSDK::Legacy::ProcessScanEdge(Vertex *vertA, Vertex *vertB)

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{

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    int32 bottom, top;

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    if (vertA->y == vertB->y)

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        return;

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    if (vertA->y >= vertB->y) {

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        top    = vertB->y;

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        bottom = vertA->y + 1;

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    }

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    else {

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        top    = vertA->y;

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        bottom = vertB->y + 1;

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    }

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    if (top > SCREEN_YSIZE - 1 || bottom < 0)

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        return;

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    if (bottom > SCREEN_YSIZE)

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        bottom = SCREEN_YSIZE;

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    int32 fullX  = vertA->x << 16;

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    int32 deltaX = ((vertB->x - vertA->x) << 16) / (vertB->y - vertA->y);

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    if (top < 0) {

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        fullX -= top * deltaX;

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        top = 0;

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    }

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    for (int32 i = top; i < bottom; ++i) {

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        int32 trueX = fullX >> 16;

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        if (trueX < faceLineStart[i])

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            faceLineStart[i] = trueX;

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        if (trueX > faceLineEnd[i])

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            faceLineEnd[i] = trueX;

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        fullX += deltaX;

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    }

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}

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void RSDK::Legacy::ProcessScanEdgeUV(Vertex *vertA, Vertex *vertB)

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{

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    int32 bottom, top;

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    if (vertA->y == vertB->y)

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        return;

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    if (vertA->y >= vertB->y) {

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        top    = vertB->y;

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        bottom = vertA->y + 1;

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    }

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    else {

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        top    = vertA->y;

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        bottom = vertB->y + 1;

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    }

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    if (top > SCREEN_YSIZE - 1 || bottom < 0)

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        return;

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    if (bottom > SCREEN_YSIZE)

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        bottom = SCREEN_YSIZE;

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    int32 fullX  = vertA->x << 16;

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    int32 fullU  = vertA->u << 16;

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    int32 fullV  = vertA->v << 16;

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    int32 deltaX = ((vertB->x - vertA->x) << 16) / (vertB->y - vertA->y);

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    int32 deltaU = 0;

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    if (vertA->u != vertB->u)

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        deltaU = ((vertB->u - vertA->u) << 16) / (vertB->y - vertA->y);

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    int32 deltaV = 0;

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    if (vertA->v != vertB->v) {

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        deltaV = ((vertB->v - vertA->v) << 16) / (vertB->y - vertA->y);

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    }

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    if (top < 0) {

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        fullX -= top * deltaX;

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        fullU -= top * deltaU;

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        fullV -= top * deltaV;

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        top = 0;

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    }

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    for (int32 i = top; i < bottom; ++i) {

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        int32 trueX = fullX >> 16;

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        if (trueX < faceLineStart[i]) {

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            faceLineStart[i]  = trueX;

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            faceLineStartU[i] = fullU;

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            faceLineStartV[i] = fullV;

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        }

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        if (trueX > faceLineEnd[i]) {

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            faceLineEnd[i]  = trueX;

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            faceLineEndU[i] = fullU;

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            faceLineEndV[i] = fullV;

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        }

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        fullX += deltaX;

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        fullU += deltaU;

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        fullV += deltaV;

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    }

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}

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