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Textures: extract ImTextureDataUpdateNewFrame() out of ImFontAtlasUpdateNewFrame(). (#8465)

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ocornut
2026-05-15 16:34:53 +02:00
parent db161b84c9
commit 068e055510
2 changed files with 47 additions and 38 deletions
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imgui_draw.cpp
+45 -38
View File
@@ -2817,48 +2817,12 @@ void ImFontAtlasUpdateNewFrame(ImFontAtlas* atlas, int frame_count, bool rendere
// Update texture status
for (int tex_n = 0; tex_n < atlas->TexList.Size; tex_n++)
{
// Update and remove if requested
ImTextureData* tex = atlas->TexList[tex_n];
bool remove_from_list = false;
if (tex->Status == ImTextureStatus_OK)
{
tex->Updates.resize(0);
tex->UpdateRect.x = tex->UpdateRect.y = (unsigned short)~0;
tex->UpdateRect.w = tex->UpdateRect.h = 0;
}
if (tex->Status == ImTextureStatus_WantCreate && atlas->RendererHasTextures)
IM_ASSERT(tex->TexID == ImTextureID_Invalid && tex->BackendUserData == NULL && "Backend set texture's TexID/BackendUserData but did not update Status to OK.");
// Request destroy
// - Keep bool to true in order to differentiate a planned destroy vs a destroy decided by the backend.
// - We don't destroy pixels right away, as backend may have an in-flight copy from RAM.
if (tex->WantDestroyNextFrame && tex->Status != ImTextureStatus_Destroyed && tex->Status != ImTextureStatus_WantDestroy)
{
IM_ASSERT(tex->Status == ImTextureStatus_OK || tex->Status == ImTextureStatus_WantCreate || tex->Status == ImTextureStatus_WantUpdates);
tex->Status = ImTextureStatus_WantDestroy;
}
// If a texture has never reached the backend, they don't need to know about it.
// (note: backends between 1.92.0 and 1.92.4 could set an already destroyed texture to ImTextureStatus_WantDestroy
// when invalidating graphics objects twice, which would previously remove it from the list and crash.)
if (tex->Status == ImTextureStatus_WantDestroy && tex->TexID == ImTextureID_Invalid && tex->BackendUserData == NULL)
tex->Status = ImTextureStatus_Destroyed;
// Process texture being destroyed
if (tex->Status == ImTextureStatus_Destroyed)
{
IM_ASSERT(tex->TexID == ImTextureID_Invalid && tex->BackendUserData == NULL && "Backend set texture Status to Destroyed but did not clear TexID/BackendUserData!");
if (tex->WantDestroyNextFrame)
remove_from_list = true; // Destroy was scheduled by us
else
tex->Status = ImTextureStatus_WantCreate; // Destroy was done was backend: recreate it (e.g. freed resources mid-run)
}
// The backend may need defer destroying by a few frames, to handle texture used by previous in-flight rendering.
// We allow the texture staying in _WantDestroy state and increment a counter which the backend can use to take its decision.
if (tex->Status == ImTextureStatus_WantDestroy)
tex->UnusedFrames++;
// Destroy and remove
bool remove_from_list = ImTextureDataUpdateNewFrame(tex);
if (remove_from_list)
{
IM_ASSERT(atlas->TexData != tex);
@@ -2870,6 +2834,49 @@ void ImFontAtlasUpdateNewFrame(ImFontAtlas* atlas, int frame_count, bool rendere
}
}
bool ImTextureDataUpdateNewFrame(ImTextureData* tex)
{
bool remove_from_list = false;
if (tex->Status == ImTextureStatus_OK)
{
tex->Updates.resize(0);
tex->UpdateRect.x = tex->UpdateRect.y = (unsigned short)~0;
tex->UpdateRect.w = tex->UpdateRect.h = 0;
}
// Request destroy
// - Keep bool to true in order to differentiate a planned destroy vs a destroy decided by the backend.
// - We don't destroy pixels right away, as backend may have an in-flight copy from RAM.
if (tex->WantDestroyNextFrame && tex->Status != ImTextureStatus_Destroyed && tex->Status != ImTextureStatus_WantDestroy)
{
IM_ASSERT(tex->Status == ImTextureStatus_OK || tex->Status == ImTextureStatus_WantCreate || tex->Status == ImTextureStatus_WantUpdates);
tex->Status = ImTextureStatus_WantDestroy;
}
// If a texture has never reached the backend, they don't need to know about it.
// (note: backends between 1.92.0 and 1.92.4 could set an already destroyed texture to ImTextureStatus_WantDestroy
// when invalidating graphics objects twice, which would previously remove it from the list and crash.)
if (tex->Status == ImTextureStatus_WantDestroy && tex->TexID == ImTextureID_Invalid && tex->BackendUserData == NULL)
tex->Status = ImTextureStatus_Destroyed;
// Process texture being destroyed
if (tex->Status == ImTextureStatus_Destroyed)
{
IM_ASSERT(tex->TexID == ImTextureID_Invalid && tex->BackendUserData == NULL && "Backend set texture Status to Destroyed but did not clear TexID/BackendUserData!");
if (tex->WantDestroyNextFrame)
remove_from_list = true; // Destroy was scheduled by us
else
tex->Status = ImTextureStatus_WantCreate; // Destroy was done was backend: recreate it (e.g. freed resources mid-run)
}
// The backend may need defer destroying by a few frames, to handle texture used by previous in-flight rendering.
// We allow the texture staying in _WantDestroy state and increment a counter which the backend can use to take its decision.
if (tex->Status == ImTextureStatus_WantDestroy)
tex->UnusedFrames++;
return remove_from_list;
}
void ImFontAtlasTextureBlockConvert(const unsigned char* src_pixels, ImTextureFormat src_fmt, int src_pitch, unsigned char* dst_pixels, ImTextureFormat dst_fmt, int dst_pitch, int w, int h)
{
IM_ASSERT(src_pixels != NULL && dst_pixels != NULL);
imgui_internal.h
+2
View File
@@ -1702,6 +1702,7 @@ enum ImGuiActivateFlags_
};
// Early work-in-progress API for ScrollToItem()
// FIXME: Missing flags to request making both edges visible when possible.
enum ImGuiScrollFlags_
{
ImGuiScrollFlags_None = 0,
@@ -3979,6 +3980,7 @@ IMGUI_API void ImFontAtlasTextureBlockFill(ImTextureData* dst_tex,
IMGUI_API void ImFontAtlasTextureBlockCopy(ImTextureData* src_tex, int src_x, int src_y, ImTextureData* dst_tex, int dst_x, int dst_y, int w, int h);
IMGUI_API void ImFontAtlasTextureBlockQueueUpload(ImFontAtlas* atlas, ImTextureData* tex, int x, int y, int w, int h);
IMGUI_API bool ImTextureDataUpdateNewFrame(ImTextureData* tex);
IMGUI_API void ImTextureDataQueueUpload(ImTextureData* tex, int x, int y, int w, int h);
IMGUI_API int ImTextureDataGetFormatBytesPerPixel(ImTextureFormat format);
IMGUI_API const char* ImTextureDataGetStatusName(ImTextureStatus status);