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Mobile & games · #opengl
The goal is to clarify whether libgdx’s AssetManager should automatically handle GPU‑side texture invalidation after an OpenGL context loss, given that the manager currently retains CPU‑side references while the GL texture IDs become stale. Constraints include the documented responsibility of the application to manage context loss on Android, the rarity of s
VAO Binding Requirements OpenGL Core Profile requires a Vertex Array Object (VAO) to be bound before defining vertex attribute pointers. While VAOs encapsulate attribute enables and buffer bindings to reduce state-change overhead, the behavior regarding the implicit default VAO (VAO 0) varies between implementations. State Capture Constraints The API capture
The goal is to silence one recurring driver message (e.g., a performance hint that floods the callback) without losing other actionable messages of the same severity and type. The KHR_debug API (core since OpenGL 4.3) lets an application filter by source, type, and severity via glDebugMessageControl , but the message ID field is implementation-defined and un
For per-frame dynamic vertex buffer updates where the CPU must write geometry each iteration without introducing stalls, two documented OpenGL approaches compete: buffer orphaning via glBufferData(GL_STREAM_DRAW) and persistent mapping via glMapBufferRange with GL_MAP_UNSYNCHRONIZED_BIT . Buffer orphaning supplies a new data pointer each frame, enabling the
An OpenGL 4.5 core-profile application (desktop, GLFW-created context) renders a scene with several draw calls, VAOs, and shader programs per frame. After a recent change, nothing appears on screen. Polling glGetError once per frame reports GL_INVALID_OPERATION a single time, then returns GL_NO_ERROR on every subsequent call, even though the failure persists
Goal Determine the maximum size of a vertex buffer object that can be allocated in a given OpenGL 4.6 context. Constraints & Uncertainty The maximum buffer size is implementation‑dependent; the specification does not prescribe a single value, and drivers expose it through various queries. It is unclear whether the limit is identical for GL_ARRAY_BUFFER a
Goal: determine whether VAO 0 can be treated as a portable default vertex array object for vertex attribute and draw calls in OpenGL core profile contexts, compared with compatibility profile contexts. OpenGL 3.1 and later core profiles require a non-zero VAO to be bound before glVertexAttribPointer or glDrawArrays; VAO 0 is not specified as a usable default
Shared Image Resource Management Integrating Vulkan with OpenGL via VK_KHR_external_memory and GL_EXT_memory_objects allows a single allocation to be bound to both a Vulkan image and an OpenGL texture. To ensure data consistency, the application must manage synchronization using VK_KHR_external_semaphore to order access between the two APIs. Layout Transitio
Context Compatibility Across GPU Vendors Transitioning a rendering pipeline to the OpenGL Core Profile removes deprecated fixed-function features, requiring a strict reliance on shaders. While a development environment with high-end hardware may successfully initialize an OpenGL 4.6 context, production environments often utilize a wider variety of GPU vendor
libgdx
vulkan