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Examples: DirectX11: Shallow massaging to make the code more consistent/readable (following #570)

pull/574/head
ocornut 9 years ago
parent
726b91a2cd
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90493f8add
1 changed files with 45 additions and 48 deletions
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  1. 81
      examples/directx11_example/imgui_impl_dx11.cpp

81
examples/directx11_example/imgui_impl_dx11.cpp
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@ -46,6 +46,8 @@ struct VERTEX_CONSTANT_BUFFER
// - in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f)
void ImGui_ImplDX11_RenderDrawLists(ImDrawData* draw_data)
{
ID3D11DeviceContext* ctx = g_pd3dDeviceContext;
// Create and grow vertex/index buffers if needed
if (!g_pVB || g_VertexBufferSize < draw_data->TotalVtxCount)
{
@ -65,21 +67,21 @@ void ImGui_ImplDX11_RenderDrawLists(ImDrawData* draw_data)
{
if (g_pIB) { g_pIB->Release(); g_pIB = NULL; }
g_IndexBufferSize = draw_data->TotalIdxCount + 10000;
D3D11_BUFFER_DESC bufferDesc;
memset(&bufferDesc, 0, sizeof(D3D11_BUFFER_DESC));
bufferDesc.Usage = D3D11_USAGE_DYNAMIC;
bufferDesc.ByteWidth = g_IndexBufferSize * sizeof(ImDrawIdx);
bufferDesc.BindFlags = D3D11_BIND_INDEX_BUFFER;
bufferDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
if (g_pd3dDevice->CreateBuffer(&bufferDesc, NULL, &g_pIB) < 0)
D3D11_BUFFER_DESC buffer_desc;
memset(&buffer_desc, 0, sizeof(D3D11_BUFFER_DESC));
buffer_desc.Usage = D3D11_USAGE_DYNAMIC;
buffer_desc.ByteWidth = g_IndexBufferSize * sizeof(ImDrawIdx);
buffer_desc.BindFlags = D3D11_BIND_INDEX_BUFFER;
buffer_desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
if (g_pd3dDevice->CreateBuffer(&buffer_desc, NULL, &g_pIB) < 0)
return;
}
// Copy and convert all vertices into a single contiguous buffer
D3D11_MAPPED_SUBRESOURCE vtx_resource, idx_resource;
if (g_pd3dDeviceContext->Map(g_pVB, 0, D3D11_MAP_WRITE_DISCARD, 0, &vtx_resource) != S_OK)
if (ctx->Map(g_pVB, 0, D3D11_MAP_WRITE_DISCARD, 0, &vtx_resource) != S_OK)
return;
if (g_pd3dDeviceContext->Map(g_pIB, 0, D3D11_MAP_WRITE_DISCARD, 0, &idx_resource) != S_OK)
if (ctx->Map(g_pIB, 0, D3D11_MAP_WRITE_DISCARD, 0, &idx_resource) != S_OK)
return;
ImDrawVert* vtx_dst = (ImDrawVert*)vtx_resource.pData;
ImDrawIdx* idx_dst = (ImDrawIdx*)idx_resource.pData;
@ -91,33 +93,31 @@ void ImGui_ImplDX11_RenderDrawLists(ImDrawData* draw_data)
vtx_dst += cmd_list->VtxBuffer.size();
idx_dst += cmd_list->IdxBuffer.size();
}
g_pd3dDeviceContext->Unmap(g_pVB, 0);
g_pd3dDeviceContext->Unmap(g_pIB, 0);
ctx->Unmap(g_pVB, 0);
ctx->Unmap(g_pIB, 0);
// Setup orthographic projection matrix into our constant buffer
{
D3D11_MAPPED_SUBRESOURCE mappedResource;
if (g_pd3dDeviceContext->Map(g_pVertexConstantBuffer, 0, D3D11_MAP_WRITE_DISCARD, 0, &mappedResource) != S_OK)
D3D11_MAPPED_SUBRESOURCE mapped_resource;
if (ctx->Map(g_pVertexConstantBuffer, 0, D3D11_MAP_WRITE_DISCARD, 0, &mapped_resource) != S_OK)
return;
VERTEX_CONSTANT_BUFFER* pConstantBuffer = (VERTEX_CONSTANT_BUFFER*)mappedResource.pData;
const float L = 0.0f;
const float R = ImGui::GetIO().DisplaySize.x;
const float B = ImGui::GetIO().DisplaySize.y;
const float T = 0.0f;
const float mvp[4][4] =
VERTEX_CONSTANT_BUFFER* constant_buffer = (VERTEX_CONSTANT_BUFFER*)mapped_resource.pData;
float L = 0.0f;
float R = ImGui::GetIO().DisplaySize.x;
float B = ImGui::GetIO().DisplaySize.y;
float T = 0.0f;
float mvp[4][4] =
{
{ 2.0f/(R-L), 0.0f, 0.0f, 0.0f },
{ 0.0f, 2.0f/(T-B), 0.0f, 0.0f },
{ 0.0f, 0.0f, 0.5f, 0.0f },
{ (R+L)/(L-R), (T+B)/(B-T), 0.5f, 1.0f },
};
memcpy(&pConstantBuffer->mvp, mvp, sizeof(mvp));
g_pd3dDeviceContext->Unmap(g_pVertexConstantBuffer, 0);
memcpy(&constant_buffer->mvp, mvp, sizeof(mvp));
ctx->Unmap(g_pVertexConstantBuffer, 0);
}
// Backup DX state that will be modified to restore it afterwards (unfortunately this is very ugly looking and verbose. Close your eyes!)
ID3D11DeviceContext* ctx = g_pd3dDeviceContext;
struct BACKUP_DX11_STATE
{
UINT ScissorRectsCount, ViewportsCount;
@ -157,34 +157,31 @@ void ImGui_ImplDX11_RenderDrawLists(ImDrawData* draw_data)
ctx->IAGetInputLayout(&old.InputLayout);
// Setup viewport
{
D3D11_VIEWPORT vp;
memset(&vp, 0, sizeof(D3D11_VIEWPORT));
vp.Width = ImGui::GetIO().DisplaySize.x;
vp.Height = ImGui::GetIO().DisplaySize.y;
vp.MinDepth = 0.0f;
vp.MaxDepth = 1.0f;
vp.TopLeftX = 0;
vp.TopLeftY = 0;
g_pd3dDeviceContext->RSSetViewports(1, &vp);
}
vp.TopLeftX = vp.TopLeftY = 0.0f;
ctx->RSSetViewports(1, &vp);
// Bind shader and vertex buffers
unsigned int stride = sizeof(ImDrawVert);
unsigned int offset = 0;
g_pd3dDeviceContext->IASetInputLayout(g_pInputLayout);
g_pd3dDeviceContext->IASetVertexBuffers(0, 1, &g_pVB, &stride, &offset);
g_pd3dDeviceContext->IASetIndexBuffer(g_pIB, sizeof(ImDrawIdx) == 2 ? DXGI_FORMAT_R16_UINT : DXGI_FORMAT_R32_UINT, 0);
g_pd3dDeviceContext->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
g_pd3dDeviceContext->VSSetShader(g_pVertexShader, NULL, 0);
g_pd3dDeviceContext->VSSetConstantBuffers(0, 1, &g_pVertexConstantBuffer);
g_pd3dDeviceContext->PSSetShader(g_pPixelShader, NULL, 0);
g_pd3dDeviceContext->PSSetSamplers(0, 1, &g_pFontSampler);
ctx->IASetInputLayout(g_pInputLayout);
ctx->IASetVertexBuffers(0, 1, &g_pVB, &stride, &offset);
ctx->IASetIndexBuffer(g_pIB, sizeof(ImDrawIdx) == 2 ? DXGI_FORMAT_R16_UINT : DXGI_FORMAT_R32_UINT, 0);
ctx->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
ctx->VSSetShader(g_pVertexShader, NULL, 0);
ctx->VSSetConstantBuffers(0, 1, &g_pVertexConstantBuffer);
ctx->PSSetShader(g_pPixelShader, NULL, 0);
ctx->PSSetSamplers(0, 1, &g_pFontSampler);
// Setup render state
const float blendFactor[4] = { 0.f, 0.f, 0.f, 0.f };
g_pd3dDeviceContext->OMSetBlendState(g_pBlendState, blendFactor, 0xffffffff);
g_pd3dDeviceContext->RSSetState(g_pRasterizerState);
const float blend_factor[4] = { 0.f, 0.f, 0.f, 0.f };
ctx->OMSetBlendState(g_pBlendState, blend_factor, 0xffffffff);
ctx->RSSetState(g_pRasterizerState);
// Render command lists
int vtx_offset = 0;
@ -202,9 +199,9 @@ void ImGui_ImplDX11_RenderDrawLists(ImDrawData* draw_data)
else
{
const D3D11_RECT r = { (LONG)pcmd->ClipRect.x, (LONG)pcmd->ClipRect.y, (LONG)pcmd->ClipRect.z, (LONG)pcmd->ClipRect.w };
g_pd3dDeviceContext->PSSetShaderResources(0, 1, (ID3D11ShaderResourceView**)&pcmd->TextureId);
g_pd3dDeviceContext->RSSetScissorRects(1, &r);
g_pd3dDeviceContext->DrawIndexed(pcmd->ElemCount, idx_offset, vtx_offset);
ctx->PSSetShaderResources(0, 1, (ID3D11ShaderResourceView**)&pcmd->TextureId);
ctx->RSSetScissorRects(1, &r);
ctx->DrawIndexed(pcmd->ElemCount, idx_offset, vtx_offset);
}
idx_offset += pcmd->ElemCount;
}

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