emscripten-core/emscripten

"null function or function signature mismatch" for `glClearDepth`

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#18,689 创建于 2023年2月8日

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Desktop OpenGL emulationhelp wanted

描述

I believe this issue is the same as Issue 14801 but for glClearDepth; that function is null. Other core functions (such as glClear) load just fine (the loader is GLAD), and the program works correctly under desktop.

Note that glClearDepth takes a double and has been available since OpenGL (not WebGL) 2.0, while glClearDepthf (which I found poking around the Emscripten source) takes a float and is available since OpenGL 4.1 (see docs for both). Note that glClearDepthf is null as well. The corresponding WebGL call is .clearDepth.

Version (emcc -v)

emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.30 (cfe2bdfe2692457cb5f5770672f6e5ccb3ffc2f2)
clang version 16.0.0 (https://github.com/llvm/llvm-project 800f0f1546b2352ba42a4777149afb13cb874fcd)

贡献者指南

技术栈
cppwasm
领域
tooling
议题类型
bug
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
half day
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
fresh
清晰度议题是否清楚说明期望改动、验收标准和下一步。
mostly clear
前置要求
C++EmscriptenOpenGL/WebGL
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
35
研究方向
Investigate how other GL functions like glClear are implemented in Emscripten (e.g., via WebGL bindings). The issue reports that glClearDepth and glClearDepthf are null. The corresponding WebGL method is clearDepth. Look at the similar issue #14801 for guidance. Locate the GL function definitions in the Emscripten source (likely HTML5/GL related files) and add the missing binding for glClearDepth, mapping it to WebGL's clearDepth with proper type handling (double for glClearDepth, float for glClearDepthf). Ensure that the new function is properly exposed and tested.