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Add support for draw list user callbacks in ImGui integration #84

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Add support for draw list user callbacks in ImGui integration #84

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45 changes: 28 additions & 17 deletions src/Magnum/ImGuiIntegration/Context.cpp
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Expand Up @@ -318,23 +318,34 @@ void Context::drawFrame() {

for(std::int_fast32_t c = 0; c < cmdList->CmdBuffer.Size; ++c) {
const ImDrawCmd* pcmd = &cmdList->CmdBuffer[c];

GL::Renderer::setScissor(Range2Di{Range2D{
{pcmd->ClipRect.x, fbSize.y() - pcmd->ClipRect.w},
{pcmd->ClipRect.z, fbSize.y() - pcmd->ClipRect.y}}
.scaled(_supersamplingRatio)});

_mesh.setCount(pcmd->ElemCount);
_mesh.setIndexBuffer(_indexBuffer, indexBufferOffset*sizeof(ImDrawIdx),
sizeof(ImDrawIdx) == 2
? GL::MeshIndexType::UnsignedShort
: GL::MeshIndexType::UnsignedInt);

indexBufferOffset += pcmd->ElemCount;

_shader
.bindTexture(*static_cast<GL::Texture2D*>(pcmd->TextureId))
.draw(_mesh);
if (pcmd->UserCallback)
{
// User callback, registered via ImDrawList::AddCallback()
// ImDrawCallback_ResetRenderState is a special callback value
// used by the user to request the renderer to reset render
// state. We do not have anything to do here though...
if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
;
else
pcmd->UserCallback(cmdList, pcmd);
} else {
GL::Renderer::setScissor(Range2Di{Range2D{
{pcmd->ClipRect.x, fbSize.y() - pcmd->ClipRect.w},
{pcmd->ClipRect.z, fbSize.y() - pcmd->ClipRect.y}}
.scaled(_supersamplingRatio)});

_mesh.setCount(pcmd->ElemCount);
_mesh.setIndexBuffer(_indexBuffer, indexBufferOffset*sizeof(ImDrawIdx),
sizeof(ImDrawIdx) == 2
? GL::MeshIndexType::UnsignedShort
: GL::MeshIndexType::UnsignedInt);

indexBufferOffset += pcmd->ElemCount;

_shader
.bindTexture(*static_cast<GL::Texture2D*>(pcmd->TextureId))
.draw(_mesh);
}
}
}

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