UserCallback bindings

How are you handling situations when the render state changes, in vulkan they are using a callback function. Is it possible for you to quickly add this binding to your native library?

`    // Render command lists
    // (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];
        for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
        {
            const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
            if (pcmd->UserCallback != NULL)
            {
                // 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.)
                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
                    ImGui_ImplVulkan_SetupRenderState(draw_data, command_buffer, rb, fb_width, fb_height);
                else
                    pcmd->UserCallback(cmd_list, pcmd);
            }
            else
            {
                // Project scissor/clipping rectangles into framebuffer space
                ImVec4 clip_rect;
                clip_rect.x = (pcmd->ClipRect.x - clip_off.x) * clip_scale.x;
                clip_rect.y = (pcmd->ClipRect.y - clip_off.y) * clip_scale.y;
                clip_rect.z = (pcmd->ClipRect.z - clip_off.x) * clip_scale.x;
                clip_rect.w = (pcmd->ClipRect.w - clip_off.y) * clip_scale.y;

                if (clip_rect.x < fb_width && clip_rect.y < fb_height && clip_rect.z >= 0.0f && clip_rect.w >= 0.0f)
                {
                    // Negative offsets are illegal for vkCmdSetScissor
                    if (clip_rect.x < 0.0f)
                        clip_rect.x = 0.0f;
                    if (clip_rect.y < 0.0f)
                        clip_rect.y = 0.0f;

                    // Apply scissor/clipping rectangle
                    VkRect2D scissor;
                    scissor.offset.x = (int32_t)(clip_rect.x);
                    scissor.offset.y = (int32_t)(clip_rect.y);
                    scissor.extent.width = (uint32_t)(clip_rect.z - clip_rect.x);
                    scissor.extent.height = (uint32_t)(clip_rect.w - clip_rect.y);
                    vkCmdSetScissor(command_buffer, 0, 1, &scissor);

                    // Draw
                    vkCmdDrawIndexed(command_buffer, pcmd->ElemCount, 1, pcmd->IdxOffset + global_idx_offset, pcmd->VtxOffset + global_vtx_offset, 0);
                }
            }
        }
        global_idx_offset += cmd_list->IdxBuffer.Size;
        global_vtx_offset += cmd_list->VtxBuffer.Size;
    }`

[calvertdw]

I got rendering to the ImGui window working via a framebuffer texture.

[gviznyuk]

Awesome, thanks! Greetings,

Thanks, Georgii

On Thu, Feb 11, 2021 at 8:13 PM Duncan Calvert [e-mail] wrote:

I got rendering to the ImGui window working via a framebuffer texture.

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