render to texture sans modif applicationclass.cpp

enginecustom/displayplaneclass.cpp

@@ -0,0 +1,199 @@
+#include "displayplaneclass.h"
+
+
+DisplayPlaneClass::DisplayPlaneClass()
+{
+    m_vertexBuffer = 0;
+    m_indexBuffer = 0;
+}
+
+
+DisplayPlaneClass::DisplayPlaneClass(const DisplayPlaneClass& other)
+{
+}
+
+
+DisplayPlaneClass::~DisplayPlaneClass()
+{
+}
+
+bool DisplayPlaneClass::Initialize(ID3D11Device* device, float width, float height)
+{
+    bool result;
+
+
+    // Initialize the vertex and index buffer that hold the geometry for the button.
+    result = InitializeBuffers(device, width, height);
+    if (!result)
+    {
+        return false;
+    }
+
+    return true;
+}
+
+
+void DisplayPlaneClass::Shutdown()
+{
+    // Release the vertex and index buffers.
+    ShutdownBuffers();
+
+    return;
+}
+
+
+void DisplayPlaneClass::Render(ID3D11DeviceContext* deviceContext)
+{
+    // Put the vertex and index buffers on the graphics pipeline to prepare them for drawing.
+    RenderBuffers(deviceContext);
+
+    return;
+}
+
+
+int DisplayPlaneClass::GetIndexCount()
+{
+    return m_indexCount;
+}
+
+bool DisplayPlaneClass::InitializeBuffers(ID3D11Device* device, float width, float height)
+{
+    VertexType* vertices;
+    unsigned long* indices;
+    D3D11_BUFFER_DESC vertexBufferDesc, indexBufferDesc;
+    D3D11_SUBRESOURCE_DATA vertexData, indexData;
+    HRESULT result;
+    int i;
+
+
+    // Set the number of vertices in the vertex array.
+    m_vertexCount = 6;
+
+    // Set the number of indices in the index array.
+    m_indexCount = m_vertexCount;
+
+    // Create the vertex array.
+    vertices = new VertexType[m_vertexCount];
+
+    // Create the index array.
+    indices = new unsigned long[m_indexCount];
+
+    // Load the vertex array with data.
+    // First triangle.
+    vertices[0].position = XMFLOAT3(-width, height, 0.0f);  // Top left.
+    vertices[0].texture = XMFLOAT2(0.0f, 0.0f);
+
+    vertices[1].position = XMFLOAT3(width, -height, 0.0f);  // Bottom right.
+    vertices[1].texture = XMFLOAT2(1.0f, 1.0f);
+
+    vertices[2].position = XMFLOAT3(-width, -height, 0.0f);  // Bottom left.
+    vertices[2].texture = XMFLOAT2(0.0f, 1.0f);
+
+    // Second triangle.
+    vertices[3].position = XMFLOAT3(-width, height, 0.0f);  // Top left.
+    vertices[3].texture = XMFLOAT2(0.0f, 0.0f);
+
+    vertices[4].position = XMFLOAT3(width, height, 0.0f);  // Top right.
+    vertices[4].texture = XMFLOAT2(1.0f, 0.0f);
+
+    vertices[5].position = XMFLOAT3(width, -height, 0.0f);  // Bottom right.
+    vertices[5].texture = XMFLOAT2(1.0f, 1.0f);
+
+    // Load the index array with data.
+    for (i = 0; i < m_indexCount; i++)
+    {
+        indices[i] = i;
+    }
+
+    // Set up the description of the vertex buffer.
+    vertexBufferDesc.Usage = D3D11_USAGE_DEFAULT;
+    vertexBufferDesc.ByteWidth = sizeof(VertexType) * m_vertexCount;
+    vertexBufferDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
+    vertexBufferDesc.CPUAccessFlags = 0;
+    vertexBufferDesc.MiscFlags = 0;
+    vertexBufferDesc.StructureByteStride = 0;
+
+    // Give the subresource structure a pointer to the vertex data.
+    vertexData.pSysMem = vertices;
+    vertexData.SysMemPitch = 0;
+    vertexData.SysMemSlicePitch = 0;
+
+    // Now finally create the vertex buffer.
+    result = device->CreateBuffer(&vertexBufferDesc, &vertexData, &m_vertexBuffer);
+    if (FAILED(result))
+    {
+        return false;
+    }
+
+    // Set up the description of the index buffer.
+    indexBufferDesc.Usage = D3D11_USAGE_DEFAULT;
+    indexBufferDesc.ByteWidth = sizeof(unsigned long) * m_indexCount;
+    indexBufferDesc.BindFlags = D3D11_BIND_INDEX_BUFFER;
+    indexBufferDesc.CPUAccessFlags = 0;
+    indexBufferDesc.MiscFlags = 0;
+    indexBufferDesc.StructureByteStride = 0;
+
+    // Give the subresource structure a pointer to the index data.
+    indexData.pSysMem = indices;
+    indexData.SysMemPitch = 0;
+    indexData.SysMemSlicePitch = 0;
+
+    // Create the index buffer.
+    result = device->CreateBuffer(&indexBufferDesc, &indexData, &m_indexBuffer);
+    if (FAILED(result))
+    {
+        return false;
+    }
+
+    // Release the arrays now that the vertex and index buffers have been created and loaded.
+    delete[] vertices;
+    vertices = 0;
+
+    delete[] indices;
+    indices = 0;
+
+    return true;
+}
+
+
+void DisplayPlaneClass::ShutdownBuffers()
+{
+    // Release the index buffer.
+    if (m_indexBuffer)
+    {
+        m_indexBuffer->Release();
+        m_indexBuffer = 0;
+    }
+
+    // Release the vertex buffer.
+    if (m_vertexBuffer)
+    {
+        m_vertexBuffer->Release();
+        m_vertexBuffer = 0;
+    }
+
+    return;
+}
+
+
+void DisplayPlaneClass::RenderBuffers(ID3D11DeviceContext* deviceContext)
+{
+    unsigned int stride;
+    unsigned int offset;
+
+
+    // Set vertex buffer stride and offset.
+    stride = sizeof(VertexType);
+    offset = 0;
+
+    // Set the vertex buffer to active in the input assembler so it can be rendered.
+    deviceContext->IASetVertexBuffers(0, 1, &m_vertexBuffer, &stride, &offset);
+
+    // Set the index buffer to active in the input assembler so it can be rendered.
+    deviceContext->IASetIndexBuffer(m_indexBuffer, DXGI_FORMAT_R32_UINT, 0);
+
+    // Set the type of primitive that should be rendered from this vertex buffer, in this case triangles.
+    deviceContext->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
+
+    return;
+}