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EGL: Use EGL_EXT_present_opaque when available
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
)
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parent
52133a3690
commit
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@ -426,6 +426,8 @@ GLFWbool _glfwInitEGL(void)
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extensionSupportedEGL("EGL_KHR_get_all_proc_addresses");
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_glfw.egl.KHR_context_flush_control =
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extensionSupportedEGL("EGL_KHR_context_flush_control");
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_glfw.egl.EXT_present_opaque =
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extensionSupportedEGL("EGL_EXT_present_opaque");
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return GLFW_TRUE;
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}
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@ -599,6 +601,9 @@ GLFWbool _glfwCreateContextEGL(_GLFWwindow* window,
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if (!fbconfig->doublebuffer)
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setAttrib(EGL_RENDER_BUFFER, EGL_SINGLE_BUFFER);
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if (_glfw.egl.EXT_present_opaque)
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setAttrib(EGL_PRESENT_OPAQUE_EXT, !fbconfig->transparent);
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setAttrib(EGL_NONE, EGL_NONE);
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window->context.egl.surface =
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@ -108,6 +108,7 @@ typedef struct wl_egl_window* EGLNativeWindowType;
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#define EGL_CONTEXT_RELEASE_BEHAVIOR_KHR 0x2097
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#define EGL_CONTEXT_RELEASE_BEHAVIOR_NONE_KHR 0
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#define EGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_KHR 0x2098
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#define EGL_PRESENT_OPAQUE_EXT 0x31df
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typedef int EGLint;
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typedef unsigned int EGLBoolean;
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@ -179,6 +180,7 @@ typedef struct _GLFWlibraryEGL
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GLFWbool KHR_gl_colorspace;
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GLFWbool KHR_get_all_proc_addresses;
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GLFWbool KHR_context_flush_control;
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GLFWbool EXT_present_opaque;
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void* handle;
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