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Backends: OpenGL2/3: Backup and restore GL_UNPACK state in UpdateTexture(). Amends. (#9473, #8802)

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Fix setting GL_UNPACK_ROW_LENGTH twice.
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ocornut
2026-07-15 18:19:07 +02:00
parent e3927dc004
commit 0ff4a8a900
3 changed files with 19 additions and 21 deletions
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4
backends/imgui_impl_opengl2.cpp
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@@ -26,11 +26,11 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2026-07-15: OpenGL: Backup and restore GL_UNPACK_ROW_LENGTH and GL_UNPACK_ALIGNMENT in UpdateTexture() to avoid corrupting caller GL state. (#8802, #9473)
// 2026-04-23: OpenGL: Added support for standard draw callbacks (in platform_io): DrawCallback_ResetRenderState, DrawCallback_SetSamplerLinear, DrawCallback_SetSamplerNearest. (#9378)
// 2026-03-12: OpenGL: Fixed invalid assert in ImGui_ImplOpenGL3_UpdateTexture() if ImTextureID_Invalid is defined to be != 0, which became the default since 2026-03-12. (#9295)
// 2025-09-18: Call platform_io.ClearRendererHandlers() on shutdown.
// 2025-07-15: OpenGL: Set GL_UNPACK_ALIGNMENT to 1 before updating textures. (#8802)
// 2026-07-15: OpenGL: Backup and restore GL_UNPACK_ROW_LENGTH and GL_UNPACK_ALIGNMENT in UpdateTexture() to avoid corrupting caller GL state. (#8802, #9473)
// 2025-06-11: OpenGL: Added support for ImGuiBackendFlags_RendererHasTextures, for dynamic font atlas. Removed ImGui_ImplOpenGL2_CreateFontsTexture() and ImGui_ImplOpenGL2_DestroyFontsTexture().
// 2024-10-07: OpenGL: Changed default texture sampler to Clamp instead of Repeat/Wrap.
// 2024-06-28: OpenGL: ImGui_ImplOpenGL2_NewFrame() recreates font texture if it has been destroyed by ImGui_ImplOpenGL2_DestroyFontsTexture(). (#7748)
@@ -264,8 +264,6 @@ void ImGui_ImplOpenGL2_RenderDrawData(ImDrawData* draw_data)
void ImGui_ImplOpenGL2_UpdateTexture(ImTextureData* tex)
{
// Backup GL_UNPACK state that we modify, restore on exit.
// This prevents corrupting the caller's pixel store state when ImGui
// creates or updates textures mid-frame. (#8802, #9473)
GLint last_unpack_row_length = 0; GL_CALL(glGetIntegerv(GL_UNPACK_ROW_LENGTH, &last_unpack_row_length));
GLint last_unpack_alignment = 0; GL_CALL(glGetIntegerv(GL_UNPACK_ALIGNMENT, &last_unpack_alignment));