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Indexed rendering. Not in main branch because breaks rendering code too much. Will merge in trunk along with more major graphics changes lat

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This commit is contained in:
ocornut
2015-04-09 21:05:35 +01:00
parent 500a8a0e02
commit 1746b04065
6 changed files with 210 additions and 125 deletions
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37
examples/directx11_example/imgui_impl_dx11.cpp
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@ -18,6 +18,7 @@ static HWND g_hWnd = 0;
static ID3D11Device* g_pd3dDevice = NULL;
static ID3D11DeviceContext* g_pd3dDeviceContext = NULL;
static ID3D11Buffer* g_pVB = NULL;
static ID3D11Buffer* g_pIB = NULL;
static ID3D10Blob * g_pVertexShaderBlob = NULL;
static ID3D11VertexShader* g_pVertexShader = NULL;
static ID3D11InputLayout* g_pInputLayout = NULL;
@ -27,7 +28,8 @@ static ID3D11PixelShader* g_pPixelShader = NULL;
static ID3D11SamplerState* g_pFontSampler = NULL;
static ID3D11ShaderResourceView*g_pFontTextureView = NULL;
static ID3D11BlendState* g_blendState = NULL;
static int VERTEX_BUFFER_SIZE = 30000; // TODO: Make vertex buffer smaller and grow dynamically as needed.
static int VERTEX_BUFFER_SIZE = 30000; // TODO: Make buffers smaller and grow dynamically as needed.
static int INDEX_BUFFER_SIZE = 30000; // TODO: Make buffers smaller and grow dynamically as needed.
struct CUSTOMVERTEX
{
@ -47,10 +49,13 @@ struct VERTEX_CONSTANT_BUFFER
static void ImGui_ImplDX11_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_count)
{
// Copy and convert all vertices into a single contiguous buffer
D3D11_MAPPED_SUBRESOURCE mappedResource;
if (g_pd3dDeviceContext->Map(g_pVB, 0, D3D11_MAP_WRITE_DISCARD, 0, &mappedResource) != S_OK)
D3D11_MAPPED_SUBRESOURCE vtx_resource, idx_resource;
if (g_pd3dDeviceContext->Map(g_pVB, 0, D3D11_MAP_WRITE_DISCARD, 0, &vtx_resource) != S_OK)
return;
CUSTOMVERTEX* vtx_dst = (CUSTOMVERTEX*)mappedResource.pData;
if (g_pd3dDeviceContext->Map(g_pIB, 0, D3D11_MAP_WRITE_DISCARD, 0, &idx_resource) != S_OK)
return;
CUSTOMVERTEX* vtx_dst = (CUSTOMVERTEX*)vtx_resource.pData;
ImDrawIdx* idx_dst = (ImDrawIdx*)idx_resource.pData;
for (int n = 0; n < cmd_lists_count; n++)
{
const ImDrawList* cmd_list = cmd_lists[n];
@ -65,8 +70,11 @@ static void ImGui_ImplDX11_RenderDrawLists(ImDrawList** const cmd_lists, int cmd
vtx_dst++;
vtx_src++;
}
memcpy(idx_dst, &cmd_list->idx_buffer[0], cmd_list->idx_buffer.size() * sizeof(ImDrawIdx));
idx_dst += cmd_list->idx_buffer.size();
}
g_pd3dDeviceContext->Unmap(g_pVB, 0);
g_pd3dDeviceContext->Unmap(g_pIB, 0);
// Setup orthographic projection matrix into our constant buffer
{
@ -108,6 +116,7 @@ static void ImGui_ImplDX11_RenderDrawLists(ImDrawList** const cmd_lists, int cmd
unsigned int offset = 0;
g_pd3dDeviceContext->IASetInputLayout(g_pInputLayout);
g_pd3dDeviceContext->IASetVertexBuffers(0, 1, &g_pVB, &stride, &offset);
g_pd3dDeviceContext->IASetIndexBuffer(g_pIB, DXGI_FORMAT_R16_UINT, 0);
g_pd3dDeviceContext->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
g_pd3dDeviceContext->VSSetShader(g_pVertexShader, NULL, 0);
g_pd3dDeviceContext->VSSetConstantBuffers(0, 1, &g_pVertexConstantBuffer);
@ -120,6 +129,7 @@ static void ImGui_ImplDX11_RenderDrawLists(ImDrawList** const cmd_lists, int cmd
// Render command lists
int vtx_offset = 0;
int idx_offset = 0;
for (int n = 0; n < cmd_lists_count; n++)
{
const ImDrawList* cmd_list = cmd_lists[n];
@ -135,10 +145,11 @@ static void ImGui_ImplDX11_RenderDrawLists(ImDrawList** const cmd_lists, int cmd
const D3D11_RECT r = { (LONG)pcmd->clip_rect.x, (LONG)pcmd->clip_rect.y, (LONG)pcmd->clip_rect.z, (LONG)pcmd->clip_rect.w };
g_pd3dDeviceContext->PSSetShaderResources(0, 1, (ID3D11ShaderResourceView**)&pcmd->texture_id);
g_pd3dDeviceContext->RSSetScissorRects(1, &r);
g_pd3dDeviceContext->Draw(pcmd->vtx_count, vtx_offset);
g_pd3dDeviceContext->DrawIndexed(pcmd->idx_count, idx_offset, vtx_offset);
}
vtx_offset += pcmd->vtx_count;
idx_offset += pcmd->idx_count;
}
vtx_offset += cmd_list->vtx_buffer.size();
}
// Restore modified state
@ -362,11 +373,22 @@ bool ImGui_ImplDX11_CreateDeviceObjects()
bufferDesc.ByteWidth = VERTEX_BUFFER_SIZE * sizeof(CUSTOMVERTEX);
bufferDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
bufferDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
bufferDesc.MiscFlags = 0;
if (g_pd3dDevice->CreateBuffer(&bufferDesc, NULL, &g_pVB) < 0)
return false;
}
// Create the index buffer
{
D3D11_BUFFER_DESC bufferDesc;
memset(&bufferDesc, 0, sizeof(D3D11_BUFFER_DESC));
bufferDesc.Usage = D3D11_USAGE_DYNAMIC;
bufferDesc.ByteWidth = INDEX_BUFFER_SIZE * sizeof(ImDrawIdx);
bufferDesc.BindFlags = D3D11_BIND_INDEX_BUFFER;
bufferDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
if (g_pd3dDevice->CreateBuffer(&bufferDesc, NULL, &g_pIB) < 0)
return false;
}
ImGui_ImplDX11_CreateFontsTexture();
return true;
@ -379,6 +401,7 @@ void ImGui_ImplDX11_InvalidateDeviceObjects()
if (g_pFontSampler) { g_pFontSampler->Release(); g_pFontSampler = NULL; }
if (g_pFontTextureView) { g_pFontTextureView->Release(); ImGui::GetIO().Fonts->TexID = 0; }
if (g_pIB) { g_pIB->Release(); g_pIB = NULL; }
if (g_pVB) { g_pVB->Release(); g_pVB = NULL; }
if (g_blendState) { g_blendState->Release(); g_blendState = NULL; }