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EGL: Use EGL_EXT_present_opaque when available

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This extensions allows GLFW to instruct the driver to ignore the alpha
bits, even in formats which contain them.  This makes it possible to use
the alpha bits as extra storage, without it affecting the end result
getting displayed to the user.

Fixes #1434
Fixes #1803

(cherry picked from commit 6281f498c8)
This commit is contained in:
Emmanuel Gil Peyrot 2021-12-14 18:35:30 +01:00 committed by Camilla Löwy
parent 52133a3690
commit 5470fd6de9
2 changed files with 7 additions and 0 deletions
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5
src/egl_context.c
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@ -426,6 +426,8 @@ GLFWbool _glfwInitEGL(void)
extensionSupportedEGL("EGL_KHR_get_all_proc_addresses");
_glfw.egl.KHR_context_flush_control =
extensionSupportedEGL("EGL_KHR_context_flush_control");
_glfw.egl.EXT_present_opaque =
extensionSupportedEGL("EGL_EXT_present_opaque");
return GLFW_TRUE;
}
@ -599,6 +601,9 @@ GLFWbool _glfwCreateContextEGL(_GLFWwindow* window,
if (!fbconfig->doublebuffer)
setAttrib(EGL_RENDER_BUFFER, EGL_SINGLE_BUFFER);
if (_glfw.egl.EXT_present_opaque)
setAttrib(EGL_PRESENT_OPAQUE_EXT, !fbconfig->transparent);
setAttrib(EGL_NONE, EGL_NONE);
window->context.egl.surface =

2
src/egl_context.h
View File

@ -108,6 +108,7 @@ typedef struct wl_egl_window* EGLNativeWindowType;
#define EGL_CONTEXT_RELEASE_BEHAVIOR_KHR 0x2097
#define EGL_CONTEXT_RELEASE_BEHAVIOR_NONE_KHR 0
#define EGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_KHR 0x2098
#define EGL_PRESENT_OPAQUE_EXT 0x31df
typedef int EGLint;
typedef unsigned int EGLBoolean;
@ -179,6 +180,7 @@ typedef struct _GLFWlibraryEGL
GLFWbool KHR_gl_colorspace;
GLFWbool KHR_get_all_proc_addresses;
GLFWbool KHR_context_flush_control;
GLFWbool EXT_present_opaque;
void* handle;