#include "stdafx.h"
#include "Renderer.h"

#include <cstring>

const float *Renderer::MatrixGet(int type)
{
    Context &c = getContext();
    const int depth = c.stackPos[type];
    return reinterpret_cast<const float *>(&c.matrixStacks[type][depth]);
}

void Renderer::MatrixMode(int type)
{
    Context &c = getContext();
    assert(type >= 0);
    assert(type < STACK_TYPES);
    c.stackType = type;
}

void Renderer::MatrixMult(float *mat)
{
    DirectX::XMMATRIX matrix;
    std::memcpy(&matrix, mat, sizeof(matrix));
    MultWithStack(matrix);
}

void Renderer::MatrixOrthogonal(float left, float right, float bottom, float top, float zNear, float zFar)
{
    const DirectX::XMMATRIX matrix = DirectX::XMMatrixOrthographicOffCenterRH(left, right, bottom, top, zNear, zFar);
    MultWithStack(matrix);
}

void Renderer::MatrixPerspective(float fovy, float aspect, float zNear, float zFar)
{
    const float fovRadians = fovy * (3.14159274f / 180.0f);
    const DirectX::XMMATRIX matrix = DirectX::XMMatrixPerspectiveFovRH(fovRadians, aspect, zNear, zFar);
    MultWithStack(matrix);
}

void Renderer::MatrixPop()
{
    Context &c = getContext();

    assert(c.stackPos[c.stackType] > 0);

    const int mode = c.stackType;
    --c.stackPos[mode];
    c.matrixDirty[mode] = true;
}

void Renderer::MatrixPush()
{
    Context &c = getContext();
    
    assert(c.stackPos[c.stackType] < (STACK_SIZE - 1));

    const int mode = c.stackType;
    const int depth = c.stackPos[mode];
    c.matrixStacks[mode][depth + 1] = c.matrixStacks[mode][depth];
    ++c.stackPos[mode];
}

void Renderer::MatrixRotate(float angle, float x, float y, float z)
{
    const DirectX::XMVECTOR axis = DirectX::XMVectorSet(x, y, z, 0.0f);
    const DirectX::XMMATRIX matrix = DirectX::XMMatrixRotationAxis(axis, angle);
    MultWithStack(matrix);
}

void Renderer::MatrixScale(float x, float y, float z)
{
    const DirectX::XMMATRIX matrix = DirectX::XMMatrixScaling(x, y, z);
    MultWithStack(matrix);
}

void Renderer::MatrixSetIdentity()
{
    Context &c = getContext();
    const int mode = c.stackType;
    const int depth = c.stackPos[mode];
    c.matrixStacks[mode][depth] = DirectX::XMMatrixIdentity();
    c.matrixDirty[mode] = true;
}

void Renderer::MatrixTranslate(float x, float y, float z)
{
    const DirectX::XMMATRIX matrix = DirectX::XMMatrixTranslation(x, y, z);
    MultWithStack(matrix);
}

void Renderer::MultWithStack(DirectX::XMMATRIX matrix)
{
    Context &c = getContext();
    const int mode = c.stackType;
    const int depth = c.stackPos[mode];
    DirectX::XMMATRIX &current = c.matrixStacks[mode][depth];
    current = DirectX::XMMatrixMultiply(matrix, current);
    c.matrixDirty[mode] = true;
}

void Renderer::Set_matrixDirty()
{
    Context &c = getContext();
    const DirectX::XMMATRIX identity = DirectX::XMMatrixIdentity();

    c.matrixStacks[MATRIX_MODE_MODELVIEW][0] = identity;
    c.matrixStacks[MATRIX_MODE_MODELVIEW_PROJECTION][0] = identity;
    c.matrixStacks[MATRIX_MODE_MODELVIEW_TEXTURE][0] = identity;
    c.matrixStacks[MATRIX_MODE_MODELVIEW_CBUFF][0] = identity;

    c.matrixDirty[MATRIX_MODE_MODELVIEW] = true;
    c.matrixDirty[MATRIX_MODE_MODELVIEW_PROJECTION] = true;
    c.matrixDirty[MATRIX_MODE_MODELVIEW_TEXTURE] = true;
    c.matrixDirty[MATRIX_MODE_MODELVIEW_CBUFF] = true;

    activeVertexType = -1;
    activePixelType = -1;
}