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Commit 28806637 authored by Gary King's avatar Gary King Committed by Brint E. Kriebel
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[egl] add support for vendor-specific GL extensions 

on implementations which have a single EGL backend, it is straight-
forward to query the EGL implementation for the supported GL extensions

the mechanism added in this commit will only work on implementations
which have a single EGL backend; on implementations which have
multiple backends, this feature should be disabled at compile-time

for EGLImage extensions, call into a wrapper layer implementation to
translate the meta-EGL object into the vendor object before calling into
the vendor's EGLImage implementation

Change-Id: Ie0e9b2dedebc534be9bca7ba0556b75eae9d006f
parent a986c2de

opengl/libs/EGL/egl.cpp

+62 −0
Original line number Diff line number Diff line
@@ -44,6 +44,15 @@ 
#include "egl_impl.h"

#include "Loader.h"



// Enable this define to allow querying vendor-specific GL extensions. This

// currently will only work correctly for implementations which have a single

// EGL backend; multiple EGL backends are not supported.

// There's also an extra subtlety with the EGLimage entry points in GL, which

// can't work properly if they're called directly (they have to go through

// a wrapper).

#define ENABLE_VENDOR_EXTENSIONS



#define MAKE_CONFIG(_impl, _index)  ((EGLConfig)(((_impl)<<24) | (_index)))

#define setError(_e, _r) setErrorEtc(__FUNCTION__, __LINE__, _e, _r)



// ----------------------------------------------------------------------------
@@ -59,6 +68,11 @@ static char const * const gExtensionString = 
        "EGL_KHR_image "

        "EGL_KHR_image_base "

        "EGL_KHR_image_pixmap "

#ifdef ENABLE_VENDOR_EXTENSIONS

        "EGL_KHR_gl_texture_2D_image "

        "EGL_KHR_gl_texture_cubemap_image "

        "EGL_KHR_gl_renderbuffer_image "

#endif

        "EGL_ANDROID_image_native_buffer "

        "EGL_ANDROID_swap_rectangle "

        ;
@@ -1365,6 +1379,31 @@ EGLint eglGetError(void) 
    return result;

}



#ifdef ENABLE_VENDOR_EXTENSIONS

// Note: Similar implementations of this function also exist in gl2.cpp and

// gl.cpp, and are used by applications that call the exported entry points

// directly.

typedef void (GL_APIENTRYP PFNGLEGLIMAGETARGETTEXTURE2DOESPROC) (GLenum target, GLeglImageOES image);

typedef void (GL_APIENTRYP PFNGLEGLIMAGETARGETRENDERBUFFERSTORAGEOESPROC) (GLenum target, GLeglImageOES image);



static PFNGLEGLIMAGETARGETTEXTURE2DOESPROC glEGLImageTargetTexture2DOES_impl = NULL;

static PFNGLEGLIMAGETARGETRENDERBUFFERSTORAGEOESPROC glEGLImageTargetRenderbufferStorageOES_impl = NULL;



static void glEGLImageTargetTexture2DOES_wrapper(GLenum target, GLeglImageOES image)

{

    GLeglImageOES implImage =

        (GLeglImageOES)egl_get_image_for_current_context((EGLImageKHR)image);

    glEGLImageTargetTexture2DOES_impl(target, implImage);

}



static void glEGLImageTargetRenderbufferStorageOES_wrapper(GLenum target, GLeglImageOES image)

{

    GLeglImageOES implImage =

        (GLeglImageOES)egl_get_image_for_current_context((EGLImageKHR)image);

    glEGLImageTargetRenderbufferStorageOES_impl(target, implImage);

}

#endif



__eglMustCastToProperFunctionPointerType eglGetProcAddress(const char *procname)

{

    // eglGetProcAddress() could be the very first function called
@@ -1380,6 +1419,29 @@ __eglMustCastToProperFunctionPointerType eglGetProcAddress(const char *procname) 
    addr = findProcAddress(procname, gExtentionMap, NELEM(gExtentionMap));

    if (addr) return addr;



#ifdef ENABLE_VENDOR_EXTENSIONS

    addr = 0;

    for (int i=0 ; i<IMPL_NUM_IMPLEMENTATIONS ; i++) {

        egl_connection_t* const cnx = &gEGLImpl[i];

        if (cnx->dso) {

            if (cnx->egl.eglGetProcAddress) {

                addr = cnx->egl.eglGetProcAddress(procname);

                if (addr) {

                    if (!strcmp(procname, "glEGLImageTargetTexture2DOES")) {

                        glEGLImageTargetTexture2DOES_impl = (PFNGLEGLIMAGETARGETTEXTURE2DOESPROC)addr;

                        return (__eglMustCastToProperFunctionPointerType)glEGLImageTargetTexture2DOES_wrapper;

                    }

                    if (!strcmp(procname, "glEGLImageTargetRenderbufferStorageOES")) {

                        glEGLImageTargetRenderbufferStorageOES_impl = (PFNGLEGLIMAGETARGETRENDERBUFFERSTORAGEOESPROC)addr;

                        return (__eglMustCastToProperFunctionPointerType)glEGLImageTargetRenderbufferStorageOES_wrapper;

                    }

                    return addr;

                }

            }

        }

    }

#endif



    // this protects accesses to gGLExtentionMap and gGLExtentionSlot

    pthread_mutex_lock(&gInitDriverMutex);