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Examples/Backends: DirectX9/10/11/12, Vulkan, OpenGL3 (Desktop GL only): Added support for large meshes (64k+ vertices) with 16-bits indices, enable 'ImGuiBackendFlags_HasVtxOffset' config flag in back-end. (#2591)

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This commit is contained in:
omar
2019-05-29 15:53:36 +02:00
parent d1e8b698d0
commit b3dd03f582
13 changed files with 69 additions and 28 deletions
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15
examples/imgui_impl_vulkan.cpp
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@ -1,6 +1,8 @@
// dear imgui: Renderer for Vulkan
// This needs to be used along with a Platform Binding (e.g. GLFW, SDL, Win32, custom..)
// Implemented features:
// [X] Renderer: Support for large meshes (64k+ vertices) with 16-bits indices.
// Missing features:
// [ ] Renderer: User texture binding. Changes of ImTextureID aren't supported by this binding! See https://github.com/ocornut/imgui/pull/914
@ -20,6 +22,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2019-05-29: Vulkan: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_HasVtxOffset flag.
// 2019-04-30: Vulkan: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
// 2019-04-04: *BREAKING CHANGE*: Vulkan: Added ImageCount/MinImageCount fields in ImGui_ImplVulkan_InitInfo, required for initialization (was previously a hard #define IMGUI_VK_QUEUED_FRAMES 2). Added ImGui_ImplVulkan_SetMinImageCount().
// 2019-04-04: Vulkan: Added VkInstance argument to ImGui_ImplVulkanH_CreateWindow() optional helper.
@ -375,8 +378,9 @@ void ImGui_ImplVulkan_RenderDrawData(ImDrawData* draw_data, VkCommandBuffer comm
ImVec2 clip_scale = draw_data->FramebufferScale; // (1,1) unless using retina display which are often (2,2)
// Render command lists
int vtx_offset = 0;
int idx_offset = 0;
// (Because we merged all buffers into a single one, we maintain our own offset into them)
int global_vtx_offset = 0;
int global_idx_offset = 0;
for (int n = 0; n < draw_data->CmdListsCount; n++)
{
const ImDrawList* cmd_list = draw_data->CmdLists[n];
@ -418,12 +422,12 @@ void ImGui_ImplVulkan_RenderDrawData(ImDrawData* draw_data, VkCommandBuffer comm
vkCmdSetScissor(command_buffer, 0, 1, &scissor);
// Draw
vkCmdDrawIndexed(command_buffer, pcmd->ElemCount, 1, idx_offset, vtx_offset, 0);
vkCmdDrawIndexed(command_buffer, pcmd->ElemCount, 1, pcmd->IdxOffset + global_idx_offset, pcmd->VtxOffset + global_vtx_offset, 0);
}
}
idx_offset += pcmd->ElemCount;
}
vtx_offset += cmd_list->VtxBuffer.Size;
global_idx_offset += cmd_list->IdxBuffer.Size;
global_vtx_offset += cmd_list->VtxBuffer.Size;
}
}
@ -801,6 +805,7 @@ bool ImGui_ImplVulkan_Init(ImGui_ImplVulkan_InitInfo* info, VkRenderPass rend
{
ImGuiIO& io = ImGui::GetIO();
io.BackendRendererName = "imgui_impl_vulkan";
io.BackendFlags |= ImGuiBackendFlags_HasVtxOffset; // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
IM_ASSERT(info->Instance != VK_NULL_HANDLE);
IM_ASSERT(info->PhysicalDevice != VK_NULL_HANDLE);