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/* 
 * Copyright (C) 2010 - 2011 Samsung Electronics Co., Ltd. All rights reserved.
 * 
 * Contact:
 * DongKyun Yun <dk77.yun@samsung.com>
 * SangJin Kim <sangjin3.kim@samsung.com>
 * HyunGoo Kang <hyungoo1.kang@samsung.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * 
 * Contributors:
 * - S-Core Co., Ltd
 *
 */

#include "implement.h"


void EGLINTER(ConvertConfig)(struct DisplayExtra* pDisplay,
        struct ConfigExtra* ptr, GLXFBConfig config) {
	ptr->unique = EGLINTER(global).iConfigID++;
	ptr->native = config;
	int drawableType;
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_DRAWABLE_TYPE, &drawableType);
	ptr->surfaceType = 0;
	if (drawableType & GLX_PBUFFER_BIT != 0) ptr->surfaceType |= EGL_PBUFFER_BIT;
	if (drawableType & GLX_PIXMAP_BIT != 0) ptr->surfaceType |= EGL_PIXMAP_BIT;
	if (drawableType & GLX_WINDOW_BIT != 0) ptr->surfaceType |= EGL_WINDOW_BIT;
	ptr->bindToTexRGB = (ptr->surfaceType & EGL_PBUFFER_BIT != 0) ? EGL_TRUE : EGL_FALSE;
	ptr->bindToTexRGBA = (ptr->surfaceType & EGL_PBUFFER_BIT != 0) ? EGL_TRUE : EGL_FALSE;
	int configCaveat;
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_CONFIG_CAVEAT, &configCaveat);
	switch (configCaveat) {
	case GLX_NONE:	ptr->configCaveat = EGL_NONE; break;
	case GLX_SLOW_CONFIG: ptr->configCaveat = EGL_SLOW_CONFIG; break;
	case GLX_NON_CONFORMANT_CONFIG: ptr->configCaveat = EGL_NON_CONFORMANT_CONFIG; break;
	default:	assert(0); break;
	}
	int renderable;
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_X_RENDERABLE, &renderable);
	ptr->nativeRenderable = (renderable == True) ? EGL_TRUE : EGL_FALSE;
	int transparentType;
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_TRANSPARENT_TYPE, &transparentType);
	ptr->transparentType = (transparentType == GLX_TRANSPARENT_RGB) ? EGL_TRANSPARENT_RGB : EGL_NONE;
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_BUFFER_SIZE, &ptr->bufferSize);
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_RED_SIZE, &ptr->redSize);
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_GREEN_SIZE, &ptr->greenSize);
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_BLUE_SIZE, &ptr->blueSize);
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_ALPHA_SIZE, &ptr->alphaSize);
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_DEPTH_SIZE, &ptr->depthSize);
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_LEVEL, &ptr->level);
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_MAX_PBUFFER_WIDTH, &ptr->maxPbufferWidth);
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_MAX_PBUFFER_HEIGHT, &ptr->maxPbufferHeight);
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_MAX_PBUFFER_PIXELS, &ptr->maxPbufferPixels);
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_VISUAL_ID, (int*)&ptr->nativeVisualID);
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_X_VISUAL_TYPE, (int*)&ptr->nativeVisualType);
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_SAMPLE_BUFFERS, &ptr->sampleBuffers);
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_SAMPLES, &ptr->samples);
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_STENCIL_SIZE, &ptr->stencilSize);
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_TRANSPARENT_RED_VALUE, &ptr->transparentRedValue);
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_TRANSPARENT_GREEN_VALUE, &ptr->transparentGreenValue);
	FNPTR(GetFBConfigAttrib)(pDisplay->native, config, GLX_TRANSPARENT_BLUE_VALUE, &ptr->transparentBlueValue);
	ptr->luminanceSize = 0;
	ptr->alphaMaskSize = 0;
	ptr->colorBufferType = EGL_RGB_BUFFER;
	ptr->conformant = EGL_OPENGL_ES_BIT | EGL_OPENGL_ES2_BIT;
	ptr->maxSwapInterval = 1000;
	ptr->minSwapInterval = 0;
	ptr->renderableType = EGL_OPENGL_ES_BIT | EGL_OPENGL_ES2_BIT;
}

int EGLAPIENTRY EGLINTER(PrepareConfig)(struct DisplayExtra* pDisplay) {
	assert(pDisplay != NULL);
	static int attribs_for_none[] = {
		GLX_TRANSPARENT_TYPE,	GLX_NONE,
		GLX_DOUBLEBUFFER,	True,
		GLX_STEREO,			False,
		GLX_AUX_BUFFERS,		0,
		GLX_ACCUM_RED_SIZE,		0,
		GLX_ACCUM_GREEN_SIZE,	0,
		GLX_ACCUM_BLUE_SIZE,	0,
		GLX_ACCUM_ALPHA_SIZE,	0,
		GLX_RENDER_TYPE,		GLX_RGBA_BIT,
		None,
	};
	static int attribs_for_rgb[] = {
		GLX_TRANSPARENT_TYPE,	GLX_TRANSPARENT_RGB,
		GLX_DOUBLEBUFFER,	True,
		GLX_STEREO,			False,
		GLX_AUX_BUFFERS,		0,
		GLX_ACCUM_RED_SIZE,		0,
		GLX_ACCUM_GREEN_SIZE,	0,
		GLX_ACCUM_BLUE_SIZE,	0,
		GLX_ACCUM_ALPHA_SIZE,	0,
		GLX_RENDER_TYPE,		GLX_RGBA_BIT,
		None,
	};
	struct ConfigExtra* pArea;
	struct ConfigExtra* pUnit;
	int nBytes;
	int nTotalConfig = 0;
	int nConfig;
	int i;
	pDisplay->pConfigBuffer = FNPTR(ChooseFBConfig)(pDisplay->native,
	        DefaultScreen(pDisplay->native), attribs_for_none, &nConfig);
	if (nConfig > 0) {
		nBytes = (pDisplay->nConfigExtra + nConfig) * sizeof(struct ConfigExtra);
		if ((pArea = (struct ConfigExtra*)realloc(pDisplay->pConfigExtra, nBytes)) == NULL) {
			EGLINTER(SetError)(EGL_BAD_ALLOC);
			return 0;
		}
		pUnit = pArea + pDisplay->nConfigExtra;
		pDisplay->nConfigExtra += nConfig;
		pDisplay->pConfigExtra = pArea;
		for (i = 0; i < nConfig; i++) {
			EGLINTER(ConvertConfig)(pDisplay, pUnit, pDisplay->pConfigBuffer[i]);
			pUnit++;
		}
	}
	nTotalConfig = nConfig;
	XFree(pDisplay->pConfigBuffer);
	pDisplay->pConfigBuffer = NULL;
	pDisplay->pConfigBuffer = FNPTR(ChooseFBConfig)(pDisplay->native,
	        DefaultScreen(pDisplay->native), attribs_for_rgb, &nConfig);
	if (nConfig > 0) {
		nBytes = (pDisplay->nConfigExtra + nConfig) * sizeof(struct ConfigExtra);
		if ((pArea = (struct ConfigExtra*)realloc(pDisplay->pConfigExtra, nBytes)) == NULL) {
			EGLINTER(SetError)(EGL_BAD_ALLOC);
			return 0;
		}
		pUnit = pArea + pDisplay->nConfigExtra;
		pDisplay->nConfigExtra += nConfig;
		pDisplay->pConfigExtra = pArea;
		for (i = 0; i < nConfig; i++) {
			EGLINTER(ConvertConfig)(pDisplay, pUnit, pDisplay->pConfigBuffer[i]);
			pUnit++;
		}
	}
	nTotalConfig += nConfig;
	XFree(pDisplay->pConfigBuffer);
	pDisplay->pConfigBuffer = NULL;
	nBytes = pDisplay->nConfigExtra * sizeof(EGLConfig);
	EGLConfig* pAnswerArea;
	if ((pAnswerArea = (EGLConfig*)realloc(pDisplay->pConfigAnswer, nBytes)) == NULL) {
		EGLINTER(SetError)(EGL_BAD_ALLOC);
		return 0;
	}
	pDisplay->pConfigAnswer = pAnswerArea;
	//assert(nTotalConfig > 0);
	return nTotalConfig;
}

EGLBoolean EGLAPIENTRY eglGetConfigs(EGLDisplay dpy, EGLConfig *configs,
        EGLint config_size, EGLint *num_config) {
	int i;
	struct DisplayExtra* pDisplay = EGLINTER(LookUpDisplay)(dpy);
	if (pDisplay == NULL) {
		EGLINTER(SetError)(EGL_BAD_DISPLAY);
		return EGL_FALSE;
	}
	if (pDisplay->bInitialized == EGL_FALSE) {
		EGLINTER(SetError)(EGL_NOT_INITIALIZED);
		return EGL_FALSE;
	}
	if (num_config == NULL) {
		EGLINTER(SetError)(EGL_BAD_PARAMETER);
		return EGL_FALSE;
	}
	int num = pDisplay->nConfigExtra;
	if (configs == NULL) {
		*num_config = num;
	} else {
		if (config_size < num) num = config_size;
		if (num < 0) num = 0;
		*num_config = num;
		for (i = 0; i < num; i++) {
			configs[i] = (EGLConfig)(pDisplay->pConfigExtra + i);
		}
	}
	return EGL_TRUE;
}