
/*
 * Copyright 2012 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */


#include "gl/GrGLInterface.h"

#ifndef GL_GLEXT_PROTOTYPES
#define GL_GLEXT_PROTOTYPES
#endif

#include "GLES2/gl2.h"
#include "GLES2/gl2ext.h"
#include "EGL/egl.h"

#define GET_PROC(name)             \
    interface->fFunctions.f ## name = (GrGL ## name ## Proc) GetProcAddress(ghANGLELib, "gl" #name);

const GrGLInterface* GrGLCreateANGLEInterface() {

    static HMODULE ghANGLELib = NULL;

    if (NULL == ghANGLELib) {
        // We load the ANGLE library and never let it go
        ghANGLELib = LoadLibrary("libGLESv2.dll");
    }
    if (NULL == ghANGLELib) {
        // We can't setup the interface correctly w/o the DLL
        return NULL;
    }

    GrGLInterface* interface = SkNEW(GrGLInterface);
    interface->fStandard = kGLES_GrGLStandard;

    GrGLInterface::Functions* functions = &interface->fFunctions;

    GET_PROC(ActiveTexture);
    GET_PROC(AttachShader);
    GET_PROC(BindAttribLocation);
    GET_PROC(BindBuffer);
    GET_PROC(BindTexture);
    functions->fBindVertexArray =
        (GrGLBindVertexArrayProc) eglGetProcAddress("glBindVertexArrayOES");
    GET_PROC(BlendColor);
    GET_PROC(BlendFunc);
    GET_PROC(BufferData);
    GET_PROC(BufferSubData);
    GET_PROC(Clear);
    GET_PROC(ClearColor);
    GET_PROC(ClearStencil);
    GET_PROC(ColorMask);
    GET_PROC(CompileShader);
    GET_PROC(CompressedTexImage2D);
    GET_PROC(CompressedTexSubImage2D);
    GET_PROC(CopyTexSubImage2D);
    GET_PROC(CreateProgram);
    GET_PROC(CreateShader);
    GET_PROC(CullFace);
    GET_PROC(DeleteBuffers);
    GET_PROC(DeleteProgram);
    GET_PROC(DeleteShader);
    GET_PROC(DeleteTextures);
    functions->fDeleteVertexArrays =
        (GrGLDeleteVertexArraysProc) eglGetProcAddress("glDeleteVertexArraysOES");
    GET_PROC(DepthMask);
    GET_PROC(Disable);
    GET_PROC(DisableVertexAttribArray);
    GET_PROC(DrawArrays);
    GET_PROC(DrawElements);
    GET_PROC(Enable);
    GET_PROC(EnableVertexAttribArray);
    GET_PROC(Finish);
    GET_PROC(Flush);
    GET_PROC(FrontFace);
    GET_PROC(GenBuffers);
    GET_PROC(GenerateMipmap);
    GET_PROC(GenTextures);
    functions->fGenVertexArrays =
        (GrGLGenVertexArraysProc) eglGetProcAddress("glGenVertexArraysOES");
    GET_PROC(GetBufferParameteriv);
    GET_PROC(GetError);
    GET_PROC(GetIntegerv);
    GET_PROC(GetProgramInfoLog);
    GET_PROC(GetProgramiv);
    GET_PROC(GetShaderInfoLog);
    GET_PROC(GetShaderiv);
    GET_PROC(GetString);
    GET_PROC(GetStringi);
    GET_PROC(GetUniformLocation);
    GET_PROC(LineWidth);
    GET_PROC(LinkProgram);
    GET_PROC(PixelStorei);
    GET_PROC(ReadPixels);
    GET_PROC(Scissor);
    GET_PROC(ShaderSource);
    GET_PROC(StencilFunc);
    GET_PROC(StencilFuncSeparate);
    GET_PROC(StencilMask);
    GET_PROC(StencilMaskSeparate);
    GET_PROC(StencilOp);
    GET_PROC(StencilOpSeparate);
    GET_PROC(TexImage2D);
    GET_PROC(TexParameteri);
    GET_PROC(TexParameteriv);
    GET_PROC(TexSubImage2D);
#if GL_ARB_texture_storage
    GET_PROC(TexStorage2D);
#elif GL_EXT_texture_storage
    functions->fTexStorage2D = (GrGLTexStorage2DProc) eglGetProcAddress("glTexStorage2DEXT");
#endif
    GET_PROC(Uniform1f);
    GET_PROC(Uniform1i);
    GET_PROC(Uniform1fv);
    GET_PROC(Uniform1iv);

    GET_PROC(Uniform2f);
    GET_PROC(Uniform2i);
    GET_PROC(Uniform2fv);
    GET_PROC(Uniform2iv);

    GET_PROC(Uniform3f);
    GET_PROC(Uniform3i);
    GET_PROC(Uniform3fv);
    GET_PROC(Uniform3iv);

    GET_PROC(Uniform4f);
    GET_PROC(Uniform4i);
    GET_PROC(Uniform4fv);
    GET_PROC(Uniform4iv);

    GET_PROC(UniformMatrix2fv);
    GET_PROC(UniformMatrix3fv);
    GET_PROC(UniformMatrix4fv);
    GET_PROC(UseProgram);
    GET_PROC(VertexAttrib4fv);
    GET_PROC(VertexAttribPointer);
    GET_PROC(Viewport);
    GET_PROC(BindFramebuffer);
    GET_PROC(BindRenderbuffer);
    GET_PROC(CheckFramebufferStatus);
    GET_PROC(DeleteFramebuffers);
    GET_PROC(DeleteRenderbuffers);
    GET_PROC(FramebufferRenderbuffer);
    GET_PROC(FramebufferTexture2D);
    GET_PROC(GenFramebuffers);
    GET_PROC(GenRenderbuffers);
    GET_PROC(GetFramebufferAttachmentParameteriv);
    GET_PROC(GetRenderbufferParameteriv);
    GET_PROC(RenderbufferStorage);

    functions->fMapBuffer = (GrGLMapBufferProc) eglGetProcAddress("glMapBufferOES");
    functions->fUnmapBuffer = (GrGLUnmapBufferProc) eglGetProcAddress("glUnmapBufferOES");

#if GL_ES_VERSION_3_0
    functions->fMapBufferRange = GET_PROC(glMapBufferRange);
    functions->fFlushMappedBufferRange = GET_PROC(glFlushMappedBufferRange);
#else
    functions->fMapBufferRange = (GrGLMapBufferRangeProc) eglGetProcAddress("glMapBufferRange");
    functions->fFlushMappedBufferRange = (GrGLFlushMappedBufferRangeProc) eglGetProcAddress("glFlushMappedBufferRange");
#endif

    functions->fInsertEventMarker = (GrGLInsertEventMarkerProc) eglGetProcAddress("glInsertEventMarkerEXT");
    functions->fPushGroupMarker = (GrGLInsertEventMarkerProc) eglGetProcAddress("glPushGroupMarkerEXT");
    functions->fPopGroupMarker = (GrGLPopGroupMarkerProc) eglGetProcAddress("glPopGroupMarkerEXT");

#if GL_ES_VERSION_3_0
    GET_PROC(InvalidateFramebuffer);
    GET_PROC(InvalidateSubFramebuffer);
#else
    functions->fInvalidateFramebuffer = (GrGLInvalidateFramebufferProc) eglGetProcAddress("glInvalidateFramebuffer");
    functions->fInvalidateSubFramebuffer = (GrGLInvalidateSubFramebufferProc) eglGetProcAddress("glInvalidateSubFramebuffer");
#endif
    functions->fInvalidateBufferData = (GrGLInvalidateBufferDataProc) eglGetProcAddress("glInvalidateBufferData");
    functions->fInvalidateBufferSubData = (GrGLInvalidateBufferSubDataProc) eglGetProcAddress("glInvalidateBufferSubData");
    functions->fInvalidateTexImage = (GrGLInvalidateTexImageProc) eglGetProcAddress("glInvalidateTexImage");
    functions->fInvalidateTexSubImage = (GrGLInvalidateTexSubImageProc) eglGetProcAddress("glInvalidateTexSubImage");

    interface->fExtensions.init(kGLES_GrGLStandard,
                                functions->fGetString,
                                functions->fGetStringi,
                                functions->fGetIntegerv);
    return interface;
}