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Backends: SDLRenderer3: expose CurrentScaleMode in ImGui_ImplSDLRenderer3_RenderState. (#9543)

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Clownacy 2026-09-13 13:15:52 +01:00 • committed by ocornut
parent 8e174685ae
commit a5b5f2d85a
3 changed files with 13 additions and 14 deletions
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23
backends/imgui_impl_sdlrenderer3.cpp
View file

@ -62,9 +62,6 @@ struct ImGui_ImplSDLRenderer3_Data
SDL_Renderer* Renderer; // Main viewport's renderer
ImVector<SDL_FColor> ColorBuffer;
// Render State
SDL_ScaleMode CurrentScaleMode;
ImGui_ImplSDLRenderer3_Data() { memset((void*)this, 0, sizeof(*this)); }
};
@ -78,14 +75,14 @@ static ImGui_ImplSDLRenderer3_Data* ImGui_ImplSDLRenderer3_GetBackendData()
// Functions
static void ImGui_ImplSDLRenderer3_SetupRenderState(SDL_Renderer* renderer)
{
ImGui_ImplSDLRenderer3_Data* bd = ImGui_ImplSDLRenderer3_GetBackendData();
ImGui_ImplSDLRenderer3_RenderState* render_state = ImGui_ImplSDLRenderer3_GetRenderState();
// Clear out any viewports and cliprect set by the user
// FIXME: Technically speaking there are lots of other things we could backup/setup/restore during our render process.
SDL_SetRenderViewport(renderer, nullptr);
SDL_SetRenderClipRect(renderer, nullptr);
bd->CurrentScaleMode = SDL_SCALEMODE_LINEAR;
render_state->CurrentScaleMode = SDL_SCALEMODE_LINEAR;
}
void ImGui_ImplSDLRenderer3_NewFrame()
@ -115,8 +112,8 @@ static int SDL_RenderGeometryRaw8BitColor(SDL_Renderer* renderer, ImVector<SDL_F
// Draw callbacks
static void ImGui_ImplSDLRenderer3_DrawCallback_ResetRenderState(const ImDrawList*, const ImDrawCmd*) {} // Intentionally empty. Used as an identifier for rendering loop to call its code. Simpler to implement this way.
static void ImGui_ImplSDLRenderer3_DrawCallback_SetSamplerLinear(const ImDrawList*, const ImDrawCmd*) { ImGui_ImplSDLRenderer3_Data* bd = ImGui_ImplSDLRenderer3_GetBackendData(); bd->CurrentScaleMode = SDL_SCALEMODE_LINEAR; }
static void ImGui_ImplSDLRenderer3_DrawCallback_SetSamplerNearest(const ImDrawList*, const ImDrawCmd*) { ImGui_ImplSDLRenderer3_Data* bd = ImGui_ImplSDLRenderer3_GetBackendData(); bd->CurrentScaleMode = SDL_SCALEMODE_NEAREST; }
static void ImGui_ImplSDLRenderer3_DrawCallback_SetSamplerLinear(const ImDrawList*, const ImDrawCmd*) { ImGui_ImplSDLRenderer3_RenderState* render_state = ImGui_ImplSDLRenderer3_GetRenderState(); render_state->CurrentScaleMode = SDL_SCALEMODE_LINEAR; }
static void ImGui_ImplSDLRenderer3_DrawCallback_SetSamplerNearest(const ImDrawList*, const ImDrawCmd*) { ImGui_ImplSDLRenderer3_RenderState* render_state = ImGui_ImplSDLRenderer3_GetRenderState(); render_state->CurrentScaleMode = SDL_SCALEMODE_NEAREST; }
void ImGui_ImplSDLRenderer3_RenderDrawData(ImDrawData* draw_data, SDL_Renderer* renderer)
{
@ -159,19 +156,19 @@ void ImGui_ImplSDLRenderer3_RenderDrawData(ImDrawData* draw_data, SDL_Renderer*
SDL_GetRenderViewport(renderer, &old.Viewport);
SDL_GetRenderClipRect(renderer, &old.ClipRect);
// Setup desired state
ImGui_ImplSDLRenderer3_SetupRenderState(renderer);
// Setup render state structure (for callbacks and custom texture bindings)
ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
ImGui_ImplSDLRenderer3_RenderState render_state;
render_state.Renderer = renderer;
platform_io.Renderer_RenderState = &render_state;
// Setup desired state
ImGui_ImplSDLRenderer3_SetupRenderState(renderer);
// Will project scissor/clipping rectangles into framebuffer space
ImVec2 clip_off = draw_data->DisplayPos; // (0,0) unless using multi-viewports
ImVec2 clip_scale = render_scale;
SDL_ScaleMode last_scale_mode = bd->CurrentScaleMode;
SDL_ScaleMode last_scale_mode = render_state.CurrentScaleMode;
// Render command lists
for (const ImDrawList* draw_list : draw_data->CmdLists)
@ -209,12 +206,12 @@ void ImGui_ImplSDLRenderer3_RenderDrawData(ImDrawData* draw_data, SDL_Renderer*
const float* uv = (const float*)(const void*)((const char*)(vtx_buffer + pcmd->VtxOffset) + offsetof(ImDrawVert, uv));
const SDL_Color* color = (const SDL_Color*)(const void*)((const char*)(vtx_buffer + pcmd->VtxOffset) + offsetof(ImDrawVert, col)); // SDL 2.0.19+
if (last_scale_mode != bd->CurrentScaleMode)
if (last_scale_mode != render_state.CurrentScaleMode)
SDL_FlushRenderer(renderer);
// Bind texture, Draw
SDL_Texture* tex = (SDL_Texture*)pcmd->GetTexID();
SDL_SetTextureScaleMode(tex, bd->CurrentScaleMode);
SDL_SetTextureScaleMode(tex, render_state.CurrentScaleMode);
SDL_RenderGeometryRaw8BitColor(renderer, bd->ColorBuffer, tex,
xy, (int)sizeof(ImDrawVert),
color, (int)sizeof(ImDrawVert),

3
backends/imgui_impl_sdlrenderer3.h
View file

@ -27,7 +27,7 @@
#include "imgui.h" // IMGUI_IMPL_API
#ifndef IMGUI_DISABLE
struct SDL_Renderer;
#include <SDL3/SDL.h>
// Follow "Getting Started" link and check examples/ folder to learn about using backends!
IMGUI_IMPL_API bool ImGui_ImplSDLRenderer3_Init(SDL_Renderer* renderer);
@ -48,6 +48,7 @@ IMGUI_IMPL_API void ImGui_ImplSDLRenderer3_UpdateTexture(ImTextureData* tex)
struct ImGui_ImplSDLRenderer3_RenderState
{
SDL_Renderer* Renderer;
SDL_ScaleMode CurrentScaleMode;
};
static inline ImGui_ImplSDLRenderer3_RenderState* ImGui_ImplSDLRenderer3_GetRenderState() { return (ImGui_ImplSDLRenderer3_RenderState*)ImGui::GetPlatformIO().Renderer_RenderState; }

1
docs/CHANGELOG.txt
View file

@ -106,6 +106,7 @@ Other Changes:
- QNX: added QNX Screen backend. (#9492) [@mgorchak-blackberry]
- SDL2: fixed querying framebuffer scale/density when using Metal without
going through a SDL_Renderer. (#5592) [@lailoken]
- SDLRenderer3: expose CurrentScaleMode in ImGui_ImplSDLRenderer3_RenderState. (#9543, #9378) [@Clownacy]
- Vulkan: added for support for multiple Vulkan contexts with custom loaders. (#6616) [@lstalmir]
- WebGPU: fixed passing non-integer sizes to `wgpuRenderPassEncoderSetViewport()`
when when `FramebufferScale` is >1.0f. (#9515, #8628) [@WayU]