**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
**     http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/

// This source file is automatically generated

#include "jni.h"
#include "JNIHelp.h"
#include <android_runtime/AndroidRuntime.h>
#include <utils/misc.h>

#include <assert.h>
#include <GLES/gl.h>
#include <GLES/glext.h>

// Work around differences between the generated name and the actual name.

#define glBlendEquation glBlendEquationOES
#define glBlendEquationSeparate glBlendEquationSeparateOES
#define glBlendFuncSeparate glBlendFuncSeparateOES
#define glGetTexGenfv glGetTexGenfvOES
#define glGetTexGeniv glGetTexGenivOES
#define glGetTexGenxv glGetTexGenxvOES
#define glTexGenf glTexGenfOES
#define glTexGenfv glTexGenfvOES
#define glTexGeni glTexGeniOES
#define glTexGeniv glTexGenivOES
#define glTexGenx glTexGenxOES
#define glTexGenxv glTexGenxvOES


/* special calls implemented in Android's GLES wrapper used to more
 * efficiently bound-check passed arrays */
extern "C" {
GL_API void GL_APIENTRY glColorPointerBounds(GLint size, GLenum type, GLsizei stride,
        const GLvoid *ptr, GLsizei count);
GL_API void GL_APIENTRY glNormalPointerBounds(GLenum type, GLsizei stride,
        const GLvoid *pointer, GLsizei count);
GL_API void GL_APIENTRY glTexCoordPointerBounds(GLint size, GLenum type,
        GLsizei stride, const GLvoid *pointer, GLsizei count);
GL_API void GL_APIENTRY glVertexPointerBounds(GLint size, GLenum type,
        GLsizei stride, const GLvoid *pointer, GLsizei count);
GL_API void GL_APIENTRY glPointSizePointerOESBounds(GLenum type,
        GLsizei stride, const GLvoid *pointer, GLsizei count);
GL_API void GL_APIENTRY glMatrixIndexPointerOESBounds(GLint size, GLenum type,
        GLsizei stride, const GLvoid *pointer, GLsizei count);
GL_API void GL_APIENTRY glWeightPointerOESBounds(GLint size, GLenum type,
        GLsizei stride, const GLvoid *pointer, GLsizei count);
}

static int initialized = 0;

static jclass nioAccessClass;
static jclass bufferClass;
static jclass G11ImplClass;
static jmethodID getBasePointerID;
static jmethodID getBaseArrayID;
static jmethodID getBaseArrayOffsetID;
static jmethodID allowIndirectBuffersID;
static jfieldID positionID;
static jfieldID limitID;
static jfieldID elementSizeShiftID;
static jfieldID haveCheckedExtensionsID;
static jfieldID have_OES_blend_equation_separateID;
static jfieldID have_OES_blend_subtractID;
static jfieldID have_OES_framebuffer_objectID;
static jfieldID have_OES_texture_cube_mapID;

/* Cache method IDs each time the class is loaded. */

static void
nativeClassInit(JNIEnv *_env, jclass glImplClass)
{
    jclass nioAccessClassLocal = _env->FindClass("java/nio/NIOAccess");
    nioAccessClass = (jclass) _env->NewGlobalRef(nioAccessClassLocal);

    jclass bufferClassLocal = _env->FindClass("java/nio/Buffer");
    bufferClass = (jclass) _env->NewGlobalRef(bufferClassLocal);

    jclass g11impClassLocal = _env->FindClass("com/google/android/gles_jni/GLImpl");
    G11ImplClass = (jclass) _env->NewGlobalRef(g11impClassLocal);
    haveCheckedExtensionsID =  _env->GetFieldID(G11ImplClass, "haveCheckedExtensions", "Z");
    have_OES_blend_equation_separateID =  _env->GetFieldID(G11ImplClass, "have_OES_blend_equation_separate", "Z");
    have_OES_blend_subtractID =  _env->GetFieldID(G11ImplClass, "have_OES_blend_subtract", "Z");
    have_OES_framebuffer_objectID =  _env->GetFieldID(G11ImplClass, "have_OES_framebuffer_object", "Z");
    have_OES_texture_cube_mapID =  _env->GetFieldID(G11ImplClass, "have_OES_texture_cube_map", "Z");

    getBasePointerID = _env->GetStaticMethodID(nioAccessClass,
            "getBasePointer", "(Ljava/nio/Buffer;)J");
    getBaseArrayID = _env->GetStaticMethodID(nioAccessClass,
            "getBaseArray", "(Ljava/nio/Buffer;)Ljava/lang/Object;");
    getBaseArrayOffsetID = _env->GetStaticMethodID(nioAccessClass,
            "getBaseArrayOffset", "(Ljava/nio/Buffer;)I");
    allowIndirectBuffersID = _env->GetStaticMethodID(g11impClassLocal,
            "allowIndirectBuffers", "(Ljava/lang/String;)Z");
    positionID = _env->GetFieldID(bufferClass, "position", "I");
    limitID = _env->GetFieldID(bufferClass, "limit", "I");
    elementSizeShiftID =
        _env->GetFieldID(bufferClass, "_elementSizeShift", "I");
}

static void *
getPointer(JNIEnv *_env, jobject buffer, jarray *array, jint *remaining, jint *offset)
{
    jint position;
    jint limit;
    jint elementSizeShift;
    jlong pointer;

    position = _env->GetIntField(buffer, positionID);
    limit = _env->GetIntField(buffer, limitID);
    elementSizeShift = _env->GetIntField(buffer, elementSizeShiftID);
    *remaining = (limit - position) << elementSizeShift;
    pointer = _env->CallStaticLongMethod(nioAccessClass,
            getBasePointerID, buffer);
    if (pointer != 0L) {
        *array = NULL;
        return (void *) (jint) pointer;
    }

    *array = (jarray) _env->CallStaticObjectMethod(nioAccessClass,
            getBaseArrayID, buffer);
    if (*array == NULL) {
        return (void*) NULL;
    }
    *offset = _env->CallStaticIntMethod(nioAccessClass,
            getBaseArrayOffsetID, buffer);

    return NULL;
}

static void
releasePointer(JNIEnv *_env, jarray array, void *data, jboolean commit)
{
    _env->ReleasePrimitiveArrayCritical(array, data,
					   commit ? 0 : JNI_ABORT);
}

extern "C" {
extern char*  __progname;
}

static bool
allowIndirectBuffers(JNIEnv *_env) {
    static jint sIndirectBufferCompatability;
    if (sIndirectBufferCompatability == 0) {
        jobject appName = _env->NewStringUTF(::__progname);
        sIndirectBufferCompatability = _env->CallStaticBooleanMethod(G11ImplClass, allowIndirectBuffersID, appName) ? 2 : 1;
    }
    return sIndirectBufferCompatability == 2;
}

static void *
getDirectBufferPointer(JNIEnv *_env, jobject buffer) {
    if (!buffer) {
        return NULL;
    }
    void* buf = _env->GetDirectBufferAddress(buffer);
    if (buf) {
        jint position = _env->GetIntField(buffer, positionID);
        jint elementSizeShift = _env->GetIntField(buffer, elementSizeShiftID);
        buf = ((char*) buf) + (position << elementSizeShift);
    } else {
        if (allowIndirectBuffers(_env)) {
            jarray array = 0;
            jint remaining;
            jint offset;
            buf = getPointer(_env, buffer, &array, &remaining, &offset);
            if (array) {
                releasePointer(_env, array, buf, 0);
            }
            buf = buf + offset;
        } else {
            jniThrowException(_env, "java/lang/IllegalArgumentException",
                              "Must use a native order direct Buffer");
        }
    }
    return buf;
}

static int
getNumCompressedTextureFormats() {
    int numCompressedTextureFormats = 0;
    glGetIntegerv(GL_NUM_COMPRESSED_TEXTURE_FORMATS, &numCompressedTextureFormats);
    return numCompressedTextureFormats;
}

// Check if the extension at the head of pExtensions is pExtension. Note that pExtensions is
// terminated by either 0 or space, while pExtension is terminated by 0.

static bool
extensionEqual(const GLubyte* pExtensions, const GLubyte* pExtension) {
    while (true) {
        char a = *pExtensions++;
        char b = *pExtension++;
        bool aEnd = a == '\0' || a == ' ';
        bool bEnd = b == '\0';
        if ( aEnd || bEnd) {
            return aEnd == bEnd;
        }
        if ( a != b ) {
            return false;
        }
    }
}

static const GLubyte*
nextExtension(const GLubyte* pExtensions) {
    while (true) {
        char a = *pExtensions++;
        if ( a == '\0') {
            return pExtensions-1;
        } else if ( a == ' ') {
            return pExtensions;
        }
    }
}

static bool
checkForExtension(const GLubyte* pExtensions, const GLubyte* pExtension) {
    for (;*pExtensions != '\0'; pExtensions = nextExtension(pExtensions)) {
        if (extensionEqual(pExtensions, pExtension)) {
            return true;
        }
    }
    return false;
}

static bool
supportsExtension(JNIEnv *_env, jobject impl, jfieldID fieldId) {
    if (!_env->GetBooleanField(impl, haveCheckedExtensionsID)) {
        _env->SetBooleanField(impl, haveCheckedExtensionsID, true);
        const GLubyte* sExtensions = glGetString(GL_EXTENSIONS);
        _env->SetBooleanField(impl, have_OES_blend_equation_separateID,
            checkForExtension(sExtensions, (const GLubyte*) "GL_OES_blend_equation_separate"));
        _env->SetBooleanField(impl, have_OES_blend_subtractID,
            checkForExtension(sExtensions, (const GLubyte*) "GL_OES_blend_subtract"));
        _env->SetBooleanField(impl, have_OES_framebuffer_objectID,
            checkForExtension(sExtensions, (const GLubyte*) "GL_OES_framebuffer_object"));
        _env->SetBooleanField(impl, have_OES_texture_cube_mapID,
            checkForExtension(sExtensions, (const GLubyte*) "GL_OES_texture_cube_map"));
    }
    return _env->GetBooleanField(impl, fieldId);
}

// --------------------------------------------------------------------------