src/mesa/drivers/dri/common/drisw_util.c - platform/external/mesa3d - Git at Google

 /*
  * Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
  * All Rights Reserved.
  * Copyright 2010 George Sapountzis <gsapountzis@gmail.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
  * BRIAN PAUL 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.
  */

 /**
  * \file drisw_util.c
  *
  * DRISW utility functions, i.e. dri_util.c stripped from drm-specific bits.
  */

 #include "dri_util.h"
 #include "utils.h"


 /**
  * Screen functions
  */

 static void
 setupLoaderExtensions(__DRIscreen *psp,
 		      const __DRIextension **extensions)
 {
     int i;

     for (i = 0; extensions[i]; i++) {
 	if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
 	    psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
     }
 }

 static __DRIscreen *
 driCreateNewScreen(int scrn, const __DRIextension **extensions,
 		   const __DRIconfig ***driver_configs, void *data)
 {
     static const __DRIextension *emptyExtensionList[] = { NULL };
     __DRIscreen *psp;

     psp = CALLOC_STRUCT(__DRIscreenRec);
     if (!psp)
 	return NULL;

     setupLoaderExtensions(psp, extensions);

     psp->loaderPrivate = data;

     psp->extensions = emptyExtensionList;
     psp->fd = -1;
     psp->myNum = scrn;

     *driver_configs = driDriverAPI.InitScreen(psp);
     if (*driver_configs == NULL) {
 	FREE(psp);
 	return NULL;
     }

     return psp;
 }

 static void driDestroyScreen(__DRIscreen *psp)
 {
     if (psp) {
 	driDriverAPI.DestroyScreen(psp);
 	FREE(psp);
     }
 }

 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
 {
     return psp->extensions;
 }


 /**
  * Context functions
  */

 static __DRIcontext *
 driCreateContextAttribs(__DRIscreen *screen, int api,
 			const __DRIconfig *config,
 			__DRIcontext *shared,
 			unsigned num_attribs,
 			const uint32_t *attribs,
 			unsigned *error,
 			void *data)
 {
     __DRIcontext *pcp;
     const struct gl_config *modes = (config != NULL) ? &config->modes : NULL;
     void * const shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
     gl_api mesa_api;
     unsigned major_version = 1;
     unsigned minor_version = 0;
     uint32_t flags = 0;

     /* Either num_attribs is zero and attribs is NULL, or num_attribs is not
      * zero and attribs is not NULL.
      */
     assert((num_attribs == 0) == (attribs == NULL));

     switch (api) {
     case __DRI_API_OPENGL:
             mesa_api = API_OPENGL;
             break;
     case __DRI_API_GLES:
             mesa_api = API_OPENGLES;
             break;
     case __DRI_API_GLES2:
             mesa_api = API_OPENGLES2;
             break;
     case __DRI_API_OPENGL_CORE:
     default:
             return NULL;
     }

     for (unsigned i = 0; i < num_attribs; i++) {
 	switch (attribs[i * 2]) {
 	case __DRI_CTX_ATTRIB_MAJOR_VERSION:
 	    major_version = attribs[i * 2 + 1];
 	    break;
 	case __DRI_CTX_ATTRIB_MINOR_VERSION:
 	    minor_version = attribs[i * 2 + 1];
 	    break;
 	case __DRI_CTX_ATTRIB_FLAGS:
 	    flags = attribs[i * 2 + 1];
 	    break;
 	default:
 	    /* We can't create a context that satisfies the requirements of an
 	     * attribute that we don't understand.  Return failure.
 	     */
 	    return NULL;
 	}
     }

     /* There are no forward-compatible contexts before OpenGL 3.0.  The
      * GLX_ARB_create_context spec says:
      *
      *     "Forward-compatible contexts are defined only for OpenGL versions
      *     3.0 and later."
      *
      * Moreover, Mesa can't fulfill the requirements of a forward-looking
      * context.  Return failure if a forward-looking context is requested.
      *
      * In Mesa, a debug context is the same as a regular context.
      */
     if (major_version >= 3) {
 	if ((flags & ~__DRI_CTX_FLAG_DEBUG) != 0)
 	    return NULL;
     }

     pcp = CALLOC_STRUCT(__DRIcontextRec);
     if (!pcp)
         return NULL;

     pcp->loaderPrivate = data;

     pcp->driScreenPriv = screen;
     pcp->driDrawablePriv = NULL;
     pcp->driReadablePriv = NULL;

     if (!driDriverAPI.CreateContext(mesa_api, modes, pcp,
 				    major_version, minor_version,
 				    flags, error, shareCtx)) {
         FREE(pcp);
         return NULL;
     }

     return pcp;
 }

 static __DRIcontext *
 driCreateNewContextForAPI(__DRIscreen *psp, int api,
                           const __DRIconfig *config,
                           __DRIcontext *shared, void *data)
 {
     unsigned error;

     return driCreateContextAttribs(psp, api, config, shared, 0, NULL,
 				   &error, data);
 }

 static __DRIcontext *
 driCreateNewContext(__DRIscreen *psp, const __DRIconfig *config,
 		    __DRIcontext *shared, void *data)
 {
     return driCreateNewContextForAPI(psp, __DRI_API_OPENGL,
 				     config, shared, data);
 }

 static void
 driDestroyContext(__DRIcontext *pcp)
 {
     if (pcp) {
 	driDriverAPI.DestroyContext(pcp);
 	FREE(pcp);
     }
 }

 static int
 driCopyContext(__DRIcontext *dst, __DRIcontext *src, unsigned long mask)
 {
     return GL_FALSE;
 }

 static void dri_get_drawable(__DRIdrawable *pdp);
 static void dri_put_drawable(__DRIdrawable *pdp);

 static int driBindContext(__DRIcontext *pcp,
 			  __DRIdrawable *pdp,
 			  __DRIdrawable *prp)
 {
     /* Bind the drawable to the context */
     if (pcp) {
 	pcp->driDrawablePriv = pdp;
 	pcp->driReadablePriv = prp;
 	if (pdp) {
 	    pdp->driContextPriv = pcp;
 	    dri_get_drawable(pdp);
 	}
 	if (prp && pdp != prp) {
 	    dri_get_drawable(prp);
 	}
     }

     return driDriverAPI.MakeCurrent(pcp, pdp, prp);
 }

 static int driUnbindContext(__DRIcontext *pcp)
 {
     __DRIdrawable *pdp;
     __DRIdrawable *prp;

     if (pcp == NULL)
 	return GL_FALSE;

     pdp = pcp->driDrawablePriv;
     prp = pcp->driReadablePriv;

     /* already unbound */
     if (!pdp && !prp)
 	return GL_TRUE;

     driDriverAPI.UnbindContext(pcp);

     dri_put_drawable(pdp);

     if (prp != pdp) {
 	dri_put_drawable(prp);
     }

     pcp->driDrawablePriv = NULL;
     pcp->driReadablePriv = NULL;

     return GL_TRUE;
 }


 /**
  * Drawable functions
  */

 static void dri_get_drawable(__DRIdrawable *pdp)
 {
     pdp->refcount++;
 }

 static void dri_put_drawable(__DRIdrawable *pdp)
 {
     if (pdp) {
 	pdp->refcount--;
 	if (pdp->refcount)
 	    return;

 	driDriverAPI.DestroyBuffer(pdp);
 	FREE(pdp);
     }
 }

 static __DRIdrawable *
 driCreateNewDrawable(__DRIscreen *psp,
 		     const __DRIconfig *config, void *data)
 {
     __DRIdrawable *pdp;

     pdp = CALLOC_STRUCT(__DRIdrawableRec);
     if (!pdp)
 	return NULL;

     pdp->loaderPrivate = data;

     pdp->driScreenPriv = psp;
     pdp->driContextPriv = NULL;

     dri_get_drawable(pdp);

     if (!driDriverAPI.CreateBuffer(psp, pdp, &config->modes, GL_FALSE)) {
 	FREE(pdp);
 	return NULL;
     }

     pdp->lastStamp = 1; /* const */

     return pdp;
 }

 static void
 driDestroyDrawable(__DRIdrawable *pdp)
 {
     dri_put_drawable(pdp);
 }

 static void driSwapBuffers(__DRIdrawable *pdp)
 {
     driDriverAPI.SwapBuffers(pdp);
 }

 const __DRIcoreExtension driCoreExtension = {
     { __DRI_CORE, __DRI_CORE_VERSION },
     NULL, /* driCreateNewScreen */
     driDestroyScreen,
     driGetExtensions,
     driGetConfigAttrib,
     driIndexConfigAttrib,
     NULL, /* driCreateNewDrawable */
     driDestroyDrawable,
     driSwapBuffers,
     driCreateNewContext,
     driCopyContext,
     driDestroyContext,
     driBindContext,
     driUnbindContext
 };

 const __DRIswrastExtension driSWRastExtension = {
     { __DRI_SWRAST, __DRI_SWRAST_VERSION },
     driCreateNewScreen,
     driCreateNewDrawable,
     driCreateNewContextForAPI,
     driCreateContextAttribs
 };
	/*
	* Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
	* All Rights Reserved.
	* Copyright 2010 George Sapountzis <gsapountzis@gmail.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
	* BRIAN PAUL 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.
	*/

	/**
	* \file drisw_util.c
	*
	* DRISW utility functions, i.e. dri_util.c stripped from drm-specific bits.
	*/

	#include "dri_util.h"
	#include "utils.h"


	/**
	* Screen functions
	*/

	static void
	setupLoaderExtensions(__DRIscreen *psp,
	const __DRIextension **extensions)
	{
	int i;

	for (i = 0; extensions[i]; i++) {
	if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
	psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
	}
	}

	static __DRIscreen *
	driCreateNewScreen(int scrn, const __DRIextension **extensions,
	const __DRIconfig **driver_configs, void data)
	{
	static const __DRIextension *emptyExtensionList[] = { NULL };
	__DRIscreen *psp;

	psp = CALLOC_STRUCT(__DRIscreenRec);
	if (!psp)
	return NULL;

	setupLoaderExtensions(psp, extensions);

	psp->loaderPrivate = data;

	psp->extensions = emptyExtensionList;
	psp->fd = -1;
	psp->myNum = scrn;

	*driver_configs = driDriverAPI.InitScreen(psp);
	if (*driver_configs == NULL) {
	FREE(psp);
	return NULL;
	}

	return psp;
	}

	static void driDestroyScreen(__DRIscreen *psp)
	{
	if (psp) {
	driDriverAPI.DestroyScreen(psp);
	FREE(psp);
	}
	}

	static const __DRIextension *driGetExtensions(__DRIscreen psp)
	{
	return psp->extensions;
	}


	/**
	* Context functions
	*/

	static __DRIcontext *
	driCreateContextAttribs(__DRIscreen *screen, int api,
	const __DRIconfig *config,
	__DRIcontext *shared,
	unsigned num_attribs,
	const uint32_t *attribs,
	unsigned *error,
	void *data)
	{
	__DRIcontext *pcp;
	const struct gl_config *modes = (config != NULL) ? &config->modes : NULL;
	void * const shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
	gl_api mesa_api;
	unsigned major_version = 1;
	unsigned minor_version = 0;
	uint32_t flags = 0;

	/* Either num_attribs is zero and attribs is NULL, or num_attribs is not
	* zero and attribs is not NULL.
	*/
	assert((num_attribs == 0) == (attribs == NULL));

	switch (api) {
	case __DRI_API_OPENGL:
	mesa_api = API_OPENGL;
	break;
	case __DRI_API_GLES:
	mesa_api = API_OPENGLES;
	break;
	case __DRI_API_GLES2:
	mesa_api = API_OPENGLES2;
	break;
	case __DRI_API_OPENGL_CORE:
	default:
	return NULL;
	}

	for (unsigned i = 0; i < num_attribs; i++) {
	switch (attribs[i * 2]) {
	case __DRI_CTX_ATTRIB_MAJOR_VERSION:
	major_version = attribs[i * 2 + 1];
	break;
	case __DRI_CTX_ATTRIB_MINOR_VERSION:
	minor_version = attribs[i * 2 + 1];
	break;
	case __DRI_CTX_ATTRIB_FLAGS:
	flags = attribs[i * 2 + 1];
	break;
	default:
	/* We can't create a context that satisfies the requirements of an
	* attribute that we don't understand. Return failure.
	*/
	return NULL;
	}
	}

	/* There are no forward-compatible contexts before OpenGL 3.0. The
	* GLX_ARB_create_context spec says:
	*
	* "Forward-compatible contexts are defined only for OpenGL versions
	* 3.0 and later."
	*
	* Moreover, Mesa can't fulfill the requirements of a forward-looking
	* context. Return failure if a forward-looking context is requested.
	*
	* In Mesa, a debug context is the same as a regular context.
	*/
	if (major_version >= 3) {
	if ((flags & ~__DRI_CTX_FLAG_DEBUG) != 0)
	return NULL;
	}

	pcp = CALLOC_STRUCT(__DRIcontextRec);
	if (!pcp)
	return NULL;

	pcp->loaderPrivate = data;

	pcp->driScreenPriv = screen;
	pcp->driDrawablePriv = NULL;
	pcp->driReadablePriv = NULL;

	if (!driDriverAPI.CreateContext(mesa_api, modes, pcp,
	major_version, minor_version,
	flags, error, shareCtx)) {
	FREE(pcp);
	return NULL;
	}

	return pcp;
	}

	static __DRIcontext *
	driCreateNewContextForAPI(__DRIscreen *psp, int api,
	const __DRIconfig *config,
	__DRIcontext shared, void data)
	{
	unsigned error;

	return driCreateContextAttribs(psp, api, config, shared, 0, NULL,
	&error, data);
	}

	static __DRIcontext *
	driCreateNewContext(__DRIscreen psp, const __DRIconfig config,
	__DRIcontext shared, void data)
	{
	return driCreateNewContextForAPI(psp, __DRI_API_OPENGL,
	config, shared, data);
	}

	static void
	driDestroyContext(__DRIcontext *pcp)
	{
	if (pcp) {
	driDriverAPI.DestroyContext(pcp);
	FREE(pcp);
	}
	}

	static int
	driCopyContext(__DRIcontext dst, __DRIcontext src, unsigned long mask)
	{
	return GL_FALSE;
	}

	static void dri_get_drawable(__DRIdrawable *pdp);
	static void dri_put_drawable(__DRIdrawable *pdp);

	static int driBindContext(__DRIcontext *pcp,
	__DRIdrawable *pdp,
	__DRIdrawable *prp)
	{
	/* Bind the drawable to the context */
	if (pcp) {
	pcp->driDrawablePriv = pdp;
	pcp->driReadablePriv = prp;
	if (pdp) {
	pdp->driContextPriv = pcp;
	dri_get_drawable(pdp);
	}
	if (prp && pdp != prp) {
	dri_get_drawable(prp);
	}
	}

	return driDriverAPI.MakeCurrent(pcp, pdp, prp);
	}

	static int driUnbindContext(__DRIcontext *pcp)
	{
	__DRIdrawable *pdp;
	__DRIdrawable *prp;

	if (pcp == NULL)
	return GL_FALSE;

	pdp = pcp->driDrawablePriv;
	prp = pcp->driReadablePriv;

	/* already unbound */
	if (!pdp && !prp)
	return GL_TRUE;

	driDriverAPI.UnbindContext(pcp);

	dri_put_drawable(pdp);

	if (prp != pdp) {
	dri_put_drawable(prp);
	}

	pcp->driDrawablePriv = NULL;
	pcp->driReadablePriv = NULL;

	return GL_TRUE;
	}


	/**
	* Drawable functions
	*/

	static void dri_get_drawable(__DRIdrawable *pdp)
	{
	pdp->refcount++;
	}

	static void dri_put_drawable(__DRIdrawable *pdp)
	{
	if (pdp) {
	pdp->refcount--;
	if (pdp->refcount)
	return;

	driDriverAPI.DestroyBuffer(pdp);
	FREE(pdp);
	}
	}

	static __DRIdrawable *
	driCreateNewDrawable(__DRIscreen *psp,
	const __DRIconfig config, void data)
	{
	__DRIdrawable *pdp;

	pdp = CALLOC_STRUCT(__DRIdrawableRec);
	if (!pdp)
	return NULL;

	pdp->loaderPrivate = data;

	pdp->driScreenPriv = psp;
	pdp->driContextPriv = NULL;

	dri_get_drawable(pdp);

	if (!driDriverAPI.CreateBuffer(psp, pdp, &config->modes, GL_FALSE)) {
	FREE(pdp);
	return NULL;
	}

	pdp->lastStamp = 1; /* const */

	return pdp;
	}

	static void
	driDestroyDrawable(__DRIdrawable *pdp)
	{
	dri_put_drawable(pdp);
	}

	static void driSwapBuffers(__DRIdrawable *pdp)
	{
	driDriverAPI.SwapBuffers(pdp);
	}

	const __DRIcoreExtension driCoreExtension = {
	{ __DRI_CORE, __DRI_CORE_VERSION },
	NULL, /* driCreateNewScreen */
	driDestroyScreen,
	driGetExtensions,
	driGetConfigAttrib,
	driIndexConfigAttrib,
	NULL, /* driCreateNewDrawable */
	driDestroyDrawable,
	driSwapBuffers,
	driCreateNewContext,
	driCopyContext,
	driDestroyContext,
	driBindContext,
	driUnbindContext
	};

	const __DRIswrastExtension driSWRastExtension = {
	{ __DRI_SWRAST, __DRI_SWRAST_VERSION },
	driCreateNewScreen,
	driCreateNewDrawable,
	driCreateNewContextForAPI,
	driCreateContextAttribs
	};