/**************************************************************************

Copyright 2003 Eric Anholt
All Rights Reserved.

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
on the rights to use, copy, modify, merge, publish, distribute, sub
license, 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 (including the next
paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL
ERIC ANHOLT 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.

**************************************************************************/

/*
 * Authors:
 *   Eric Anholt <anholt@FreeBSD.org>
 */

#include "dri_util.h"

#include "main/context.h"
#include "utils.h"
#include "main/imports.h"
#include "main/framebuffer.h"
#include "main/renderbuffer.h"

#include "sis_context.h"
#include "sis_dri.h"
#include "sis_lock.h"

#include "xmlpool.h"

#include "GL/internal/dri_interface.h"

#define SIS_AGP_DISABLE(def) \
DRI_CONF_OPT_BEGIN(agp_disable,bool,def)				\
	DRI_CONF_DESC(en,"Disable AGP vertex dispatch")			\
DRI_CONF_OPT_END

PUBLIC const char __driConfigOptions[] =
DRI_CONF_BEGIN
	DRI_CONF_SECTION_QUALITY
		DRI_CONF_TEXTURE_DEPTH(DRI_CONF_TEXTURE_DEPTH_FB)
	DRI_CONF_SECTION_END
	DRI_CONF_SECTION_DEBUG
		SIS_AGP_DISABLE(true)
		DRI_CONF_NO_RAST(false)
	DRI_CONF_SECTION_END
DRI_CONF_END;
static const GLuint __driNConfigOptions = 3;

extern const struct dri_extension card_extensions[];

static const __DRIconfig **
sisFillInModes(__DRIscreen *psp, int bpp)
{
   __DRIconfig **configs;
   unsigned depth_buffer_factor;
   unsigned back_buffer_factor;
   GLenum fb_format;
   GLenum fb_type;
   static const GLenum back_buffer_modes[] = {
      GLX_NONE, GLX_SWAP_UNDEFINED_OML
   };
   uint8_t depth_bits_array[4];
   uint8_t stencil_bits_array[4];
   uint8_t msaa_samples_array[1];

   depth_bits_array[0] = 0;
   stencil_bits_array[0] = 0;
   depth_bits_array[1] = 16;
   stencil_bits_array[1] = 0;
   depth_bits_array[2] = 24;
   stencil_bits_array[2] = 8;
   depth_bits_array[3] = 32;
   stencil_bits_array[3] = 0;

   msaa_samples_array[0] = 0;

   depth_buffer_factor = 4;
   back_buffer_factor = 2;

   if (bpp == 16) {
      fb_format = GL_RGB;
      fb_type = GL_UNSIGNED_SHORT_5_6_5;
   } else {
      fb_format = GL_BGRA;
      fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
   }

   configs = driCreateConfigs(fb_format, fb_type, depth_bits_array,
			      stencil_bits_array, depth_buffer_factor,
			      back_buffer_modes, back_buffer_factor,
                              msaa_samples_array, 1, GL_TRUE);
   if (configs == NULL) {
      fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__, __LINE__);
      return NULL;
   }

   return (const __DRIconfig **) configs;
}


/* Create the device specific screen private data struct.
 */
static sisScreenPtr
sisCreateScreen( __DRIscreen *sPriv )
{
   sisScreenPtr sisScreen;
   SISDRIPtr sisDRIPriv = (SISDRIPtr)sPriv->pDevPriv;

   if (sPriv->devPrivSize != sizeof(SISDRIRec)) {
      fprintf(stderr,"\nERROR!  sizeof(SISDRIRec) does not match passed size from device driver\n");
      return GL_FALSE;
   }

   /* Allocate the private area */
   sisScreen = (sisScreenPtr)CALLOC( sizeof(*sisScreen) );
   if ( sisScreen == NULL )
      return NULL;

   sisScreen->screenX = sisDRIPriv->width;
   sisScreen->screenY = sisDRIPriv->height;
   sisScreen->cpp = sisDRIPriv->bytesPerPixel;
   sisScreen->deviceID = sisDRIPriv->deviceID;
   sisScreen->AGPCmdBufOffset = sisDRIPriv->AGPCmdBufOffset;
   sisScreen->AGPCmdBufSize = sisDRIPriv->AGPCmdBufSize;
   sisScreen->sarea_priv_offset = sizeof(drm_sarea_t);

   sisScreen->mmio.handle = sisDRIPriv->regs.handle;
   sisScreen->mmio.size   = sisDRIPriv->regs.size;
   if ( drmMap( sPriv->fd, sisScreen->mmio.handle, sisScreen->mmio.size,
	       &sisScreen->mmio.map ) )
   {
      FREE( sisScreen );
      return NULL;
   }

   if (sisDRIPriv->agp.size) {
      sisScreen->agp.handle = sisDRIPriv->agp.handle;
      sisScreen->agpBaseOffset = drmAgpBase(sPriv->fd);
      sisScreen->agp.size   = sisDRIPriv->agp.size;
      if ( drmMap( sPriv->fd, sisScreen->agp.handle, sisScreen->agp.size,
                   &sisScreen->agp.map ) )
      {
         sisScreen->agp.size = 0;
      }
   }

   sisScreen->driScreen = sPriv;

   /* parse information in __driConfigOptions */
   driParseOptionInfo(&sisScreen->optionCache,
		      __driConfigOptions, __driNConfigOptions);

   return sisScreen;
}

/* Destroy the device specific screen private data struct.
 */
static void
sisDestroyScreen( __DRIscreen *sPriv )
{
   sisScreenPtr sisScreen = (sisScreenPtr)sPriv->private;

   if ( sisScreen == NULL )
      return;

   if (sisScreen->agp.size != 0)
      drmUnmap( sisScreen->agp.map, sisScreen->agp.size );
   drmUnmap( sisScreen->mmio.map, sisScreen->mmio.size );

   FREE( sisScreen );
   sPriv->private = NULL;
}


/* Create and initialize the Mesa and driver specific pixmap buffer
 * data.
 */
static GLboolean
sisCreateBuffer( __DRIscreen *driScrnPriv,
                 __DRIdrawable *driDrawPriv,
                 const struct gl_config *mesaVis,
                 GLboolean isPixmap )
{
   /*sisScreenPtr screen = (sisScreenPtr) driScrnPriv->private;*/
   struct gl_framebuffer *fb;

   if (isPixmap)
      return GL_FALSE; /* not implemented */

   fb = _mesa_create_framebuffer(mesaVis);

   _mesa_add_soft_renderbuffers(fb,
				GL_FALSE, /* color */
				GL_FALSE, /* depth */
				mesaVis->stencilBits > 0,
				mesaVis->accumRedBits > 0,
				GL_FALSE, /* alpha */
				GL_FALSE /* aux */);
   driDrawPriv->driverPrivate = (void *) fb;

   return (driDrawPriv->driverPrivate != NULL);
}


static void
sisDestroyBuffer(__DRIdrawable *driDrawPriv)
{
   _mesa_reference_framebuffer((struct gl_framebuffer **)(&(driDrawPriv->driverPrivate)), NULL);
}

static void sisCopyBuffer( __DRIdrawable *dPriv )
{
   sisContextPtr smesa = (sisContextPtr)dPriv->driContextPriv->driverPrivate;
   int i;

   while ((*smesa->FrameCountPtr) - MMIO_READ(0x8a2c) > SIS_MAX_FRAME_LENGTH)
      ;

   LOCK_HARDWARE();

   for (i = 0; i < dPriv->numClipRects; i++) {
      drm_clip_rect_t *box = &dPriv->pClipRects[i];

      mWait3DCmdQueue(10);
      MMIO(REG_SRC_ADDR, smesa->back.offset);
      MMIO(REG_SRC_PITCH, smesa->back.pitch | ((smesa->bytesPerPixel == 4) ? 
			   BLIT_DEPTH_32 : BLIT_DEPTH_16));
      MMIO(REG_SRC_X_Y, ((box->x1 - dPriv->x) << 16) | (box->y1 - dPriv->y));
      MMIO(REG_DST_X_Y, ((box->x1 - dPriv->x) << 16) | (box->y1 - dPriv->y));
      MMIO(REG_DST_ADDR, smesa->front.offset);
      MMIO(REG_DST_PITCH_HEIGHT, (smesa->virtualY << 16) | smesa->front.pitch);
      MMIO(REG_WIDTH_HEIGHT, ((box->y2 - box->y1) << 16) | (box->x2 - box->x1));
      MMIO(REG_BLIT_CMD, CMD_DIR_X_INC | CMD_DIR_Y_INC | CMD_ROP_SRC);
      MMIO(REG_CommandQueue, -1);
   }

   *(GLint *)(smesa->IOBase+0x8a2c) = *smesa->FrameCountPtr;
   (*smesa->FrameCountPtr)++;  

   UNLOCK_HARDWARE ();
}


/* Copy the back color buffer to the front color buffer */
static void
sisSwapBuffers(__DRIdrawable *dPriv)
{
   if (dPriv->driContextPriv && dPriv->driContextPriv->driverPrivate) {
         sisContextPtr smesa = (sisContextPtr) dPriv->driContextPriv->driverPrivate;
         struct gl_context *ctx = smesa->glCtx;

      if (ctx->Visual.doubleBufferMode) {
         _mesa_notifySwapBuffers( ctx );  /* flush pending rendering comands */
         sisCopyBuffer( dPriv );
      }
   } else {
      /* XXX this shouldn't be an error but we can't handle it for now */
      _mesa_problem(NULL, "%s: drawable has no context!", __FUNCTION__);
   }
}


/**
 * This is the driver specific part of the createNewScreen entry point.
 * 
 * \todo maybe fold this into intelInitDriver
 *
 * \return the struct gl_config supported by this driver
 */
static const __DRIconfig **
sisInitScreen(__DRIscreen *psp)
{
   static const __DRIversion ddx_expected = {0, 8, 0};
   static const __DRIversion dri_expected = {4, 0, 0};
   static const __DRIversion drm_expected = {1, 0, 0};
   static const char *driver_name = "SiS";
   SISDRIPtr dri_priv = (SISDRIPtr)psp->pDevPriv;

   if (!driCheckDriDdxDrmVersions2(driver_name,
				   &psp->dri_version, &dri_expected,
				   &psp->ddx_version, &ddx_expected,
				   &psp->drm_version, &drm_expected))
      return NULL;

   psp->private = sisCreateScreen(psp);

   if (!psp->private) {
      sisDestroyScreen(psp);
      return NULL;
   }

   return sisFillInModes(psp, dri_priv->bytesPerPixel * 8);
}

const struct __DriverAPIRec driDriverAPI = {
   .InitScreen      = sisInitScreen,
   .DestroyScreen   = sisDestroyScreen,
   .CreateContext   = sisCreateContext,
   .DestroyContext  = sisDestroyContext,
   .CreateBuffer    = sisCreateBuffer,
   .DestroyBuffer   = sisDestroyBuffer,
   .SwapBuffers     = sisSwapBuffers,
   .MakeCurrent     = sisMakeCurrent,
   .UnbindContext   = sisUnbindContext,
   .GetSwapInfo     = NULL,
   .GetDrawableMSC  = NULL,
   .WaitForMSC      = NULL,
   .WaitForSBC      = NULL,
   .SwapBuffersMSC  = NULL

};

/* This is the table of extensions that the loader will dlsym() for. */
PUBLIC const __DRIextension *__driDriverExtensions[] = {
    &driCoreExtension.base,
    &driLegacyExtension.base,
    NULL
};