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1799ed0b28
This enables to create a C archive with Ebiten without an actual driver implementation. This enables Ebiten work on a platform Go doesn't support. See also Hitsumabushi project: github.com/hajimehoshi/hitsumabushi. The backend C API is not stable and might change later. Then, the build tag 'ebitencbackend' is not documented on purpose. Closes #1900
59 lines
1.7 KiB
Go
59 lines
1.7 KiB
Go
// SPDX-License-Identifier: MIT
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//go:build !windows
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// +build !windows
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// This file implements GlowGetProcAddress for every supported platform. The
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// correct version is chosen automatically based on build tags:
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//
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// darwin: CGL
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// linux freebsd openbsd: GLX
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//
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// Use of EGL instead of the platform's default (listed above) is made possible
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// via the "egl" build tag.
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//
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// It is also possible to install your own function outside this package for
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// retrieving OpenGL function pointers, to do this see InitWithProcAddrFunc.
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package gl
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/*
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#cgo darwin CFLAGS: -DTAG_DARWIN
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#cgo darwin LDFLAGS: -framework OpenGL
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#cgo linux freebsd openbsd CFLAGS: -DTAG_POSIX
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#cgo linux,!ebitencbackend freebsd,!ebitencbackend openbsd,!ebitencbackend pkg-config: gl
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#cgo egl CFLAGS: -DTAG_EGL
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#cgo egl,!ebitencbackend pkg-config: egl
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#cgo !darwin ebitencbackend LDFLAGS: -Wl,-unresolved-symbols=ignore-all
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#cgo darwin ebitencbackend LDFLAGS: -Wl,-undefined,dynamic_lookup
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// Check the EGL tag first as it takes priority over the platform's default
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// configuration of WGL/GLX/CGL.
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#if defined(TAG_EGL)
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#include <stdlib.h>
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#include <EGL/egl.h>
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static void* GlowGetProcAddress_gl21(const char* name) {
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return eglGetProcAddress(name);
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}
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#elif defined(TAG_DARWIN)
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#include <stdlib.h>
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#include <dlfcn.h>
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static void* GlowGetProcAddress_gl21(const char* name) {
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return dlsym(RTLD_DEFAULT, name);
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}
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#elif defined(TAG_POSIX)
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#include <stdlib.h>
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#include <GL/glx.h>
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static void* GlowGetProcAddress_gl21(const char* name) {
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return glXGetProcAddress((const GLubyte *) name);
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}
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#endif
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*/
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import "C"
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import "unsafe"
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func getProcAddress(namea string) unsafe.Pointer {
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cname := C.CString(namea)
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defer C.free(unsafe.Pointer(cname))
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return C.GlowGetProcAddress_gl21(cname)
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}
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