/**************************************************************************
 * 
 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
 * 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 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 TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
 * 
 **************************************************************************/

#include "sp_context.h"
#include "sp_state.h"
#include "sp_surface.h"
#include "pipe/p_defines.h"
#include "main/imports.h"


/**
 * Softpipe surface functions.
 * Basically, create surface of a particular type, then plug in default
 * read/write_quad functions.
 * Note that these quad funcs assume the buffer/region is in a linear
 * layout with Y=0=bottom.
 * If we had swizzled/AOS buffers the read/write functions could be
 * simplified a lot....
 */


#if 000 /* OLD... should be recycled... */
static void rgba8_read_quad_f( struct softpipe_surface *gs,
			       GLint x, GLint y,
			       GLfloat (*rgba)[NUM_CHANNELS] )
{
   GLuint i, j, k = 0;

   for (i = 0; i < 2; i++) {
      for (j = 0; j < 2; j++, k++) {
	 GLubyte *ptr = gs->surface.ptr + (y+i) * gs->surface.stride + (x+j) * 4;
	 rgba[k][0] = ptr[0] * (1.0 / 255.0);
	 rgba[k][1] = ptr[1] * (1.0 / 255.0);
	 rgba[k][2] = ptr[2] * (1.0 / 255.0);
	 rgba[k][3] = ptr[3] * (1.0 / 255.0);
      }
   }
}

static void rgba8_read_quad_f_swz( struct softpipe_surface *gs,
				   GLint x, GLint y,
				   GLfloat (*rrrr)[QUAD_SIZE] )
{
   GLuint i, j, k = 0;

   for (i = 0; i < 2; i++) {
      for (j = 0; j < 2; j++, k++) {
	 GLubyte *ptr = gs->surface.ptr + (y+i) * gs->surface.stride + (x+j) * 4;
	 rrrr[0][k] = ptr[0] * (1.0 / 255.0);
	 rrrr[1][k] = ptr[1] * (1.0 / 255.0);
	 rrrr[2][k] = ptr[2] * (1.0 / 255.0);
	 rrrr[3][k] = ptr[3] * (1.0 / 255.0);
      }
   }
}

static void rgba8_write_quad_f( struct softpipe_surface *gs,
				GLint x, GLint y,
				GLfloat (*rgba)[NUM_CHANNELS] )
{
   GLuint i, j, k = 0;

   for (i = 0; i < 2; i++) {
      for (j = 0; j < 2; j++, k++) {
	 GLubyte *ptr = gs->surface.ptr + (y+i) * gs->surface.stride + (x+j) * 4;
	 ptr[0] = rgba[k][0] * 255.0;
	 ptr[1] = rgba[k][1] * 255.0;
	 ptr[2] = rgba[k][2] * 255.0;
	 ptr[3] = rgba[k][3] * 255.0;
      }
   }
}

static void rgba8_write_quad_f_swz( struct softpipe_surface *gs,
				    GLint x, GLint y,
				    GLfloat (*rrrr)[QUAD_SIZE] )
{
   GLuint i, j, k = 0;

   for (i = 0; i < 2; i++) {
      for (j = 0; j < 2; j++, k++) {
	 GLubyte *ptr = gs->surface.ptr + (y+i) * gs->surface.stride + (x+j) * 4;
	 ptr[0] = rrrr[0][k] * 255.0;
	 ptr[1] = rrrr[1][k] * 255.0;
	 ptr[2] = rrrr[2][k] * 255.0;
	 ptr[3] = rrrr[3][k] * 255.0;
      }
   }
}

static void rgba8_read_quad_ub( struct softpipe_surface *gs,
				GLint x, GLint y,
				GLubyte (*rgba)[NUM_CHANNELS] )
{
   GLuint i, j, k = 0;

   for (i = 0; i < 2; i++) {
      for (j = 0; j < 2; j++, k++) {
	 GLubyte *ptr = gs->surface.ptr + (y+i) * gs->surface.stride + (x+j) * 4;
	 rgba[k][0] = ptr[0];
	 rgba[k][1] = ptr[1];
	 rgba[k][2] = ptr[2];
	 rgba[k][3] = ptr[3];
      }
   }
}

static void rgba8_write_quad_ub( struct softpipe_surface *gs,
				 GLint x, GLint y,
				 GLubyte (*rgba)[NUM_CHANNELS] )
{
   GLuint i, j, k = 0;

   for (i = 0; i < 2; i++) {
      for (j = 0; j < 2; j++, k++) {
	 GLubyte *ptr = gs->surface.ptr + (y+i) * gs->surface.stride + (x+j) * 4;
	 ptr[0] = rgba[k][0];
	 ptr[1] = rgba[k][1];
	 ptr[2] = rgba[k][2];
	 ptr[3] = rgba[k][3];
      }
   }
}

#endif



static void
z16_read_quad_z(struct softpipe_surface *sps,
                GLint x, GLint y, GLuint zzzz[QUAD_SIZE])
{
   const GLushort *src
      = (GLushort *) sps->surface.region->map + y * sps->surface.region->pitch + x;

   assert(sps->surface.format == PIPE_FORMAT_U_Z16);

   /* converting GLushort to GLuint: */
   zzzz[0] = src[0];
   zzzz[1] = src[1];
   src += sps->surface.region->pitch;
   zzzz[2] = src[0];
   zzzz[3] = src[1];
}

static void
z16_write_quad_z(struct softpipe_surface *sps,
                 GLint x, GLint y, const GLuint zzzz[QUAD_SIZE])
{
   GLushort *dst = (GLushort *) sps->surface.region->map + y * sps->surface.region->pitch + x;

   assert(sps->surface.format == PIPE_FORMAT_U_Z16);

   /* converting GLuint to GLushort: */
   dst[0] = zzzz[0];
   dst[1] = zzzz[1];
   dst += sps->surface.region->pitch;
   dst[0] = zzzz[2];
   dst[1] = zzzz[3];
}

static void
z32_read_quad_z(struct softpipe_surface *sps,
                GLint x, GLint y, GLuint zzzz[QUAD_SIZE])
{
   const GLuint *src
      = (GLuint *) sps->surface.region->map + y * sps->surface.region->pitch + x;

   assert(sps->surface.format == PIPE_FORMAT_U_Z32);

   zzzz[0] = src[0];
   zzzz[1] = src[1];
   src += sps->surface.region->pitch;
   zzzz[2] = src[0];
   zzzz[3] = src[1];
}

static void
z32_write_quad_z(struct softpipe_surface *sps,
                 GLint x, GLint y, const GLuint zzzz[QUAD_SIZE])
{
   GLuint *dst = (GLuint *) sps->surface.region->map + y * sps->surface.region->pitch + x;

   assert(sps->surface.format == PIPE_FORMAT_U_Z32);

   dst[0] = zzzz[0];
   dst[1] = zzzz[1];
   dst += sps->surface.region->pitch;
   dst[0] = zzzz[2];
   dst[1] = zzzz[3];
}

static void
z24s8_read_quad_z(struct softpipe_surface *sps,
                  GLint x, GLint y, GLuint zzzz[QUAD_SIZE])
{
   const GLuint *src
      = (GLuint *) sps->surface.region->map + y * sps->surface.region->pitch + x;

   assert(sps->surface.format == PIPE_FORMAT_Z24_S8);

   zzzz[0] = src[0] >> 8;
   zzzz[1] = src[1] >> 8;
   src += sps->surface.region->pitch;
   zzzz[2] = src[0] >> 8;
   zzzz[3] = src[1] >> 8;
}

static void
z24s8_write_quad_z(struct softpipe_surface *sps,
                   GLint x, GLint y, const GLuint zzzz[QUAD_SIZE])
{
   GLuint *dst = (GLuint *) sps->surface.region->map + y * sps->surface.region->pitch + x;

   assert(sps->surface.format == PIPE_FORMAT_Z24_S8);
   assert(zzzz[0] <= 0xffffff);

   dst[0] = (dst[0] & 0xff) | (zzzz[0] << 8);
   dst[1] = (dst[1] & 0xff) | (zzzz[1] << 8);
   dst += sps->surface.region->pitch;
   dst[0] = (dst[0] & 0xff) | (zzzz[2] << 8);
   dst[1] = (dst[1] & 0xff) | (zzzz[3] << 8);
}

static void
z24s8_read_quad_stencil(struct softpipe_surface *sps,
                        GLint x, GLint y, GLubyte ssss[QUAD_SIZE])
{
   const GLuint *src
      = (GLuint *) sps->surface.region->map + y * sps->surface.region->pitch + x;

   assert(sps->surface.format == PIPE_FORMAT_Z24_S8);

   ssss[0] = src[0] & 0xff;
   ssss[1] = src[1] & 0xff;
   src += sps->surface.region->pitch;
   ssss[2] = src[0] & 0xff;
   ssss[3] = src[1] & 0xff;
}

static void
z24s8_write_quad_stencil(struct softpipe_surface *sps,
                         GLint x, GLint y, const GLubyte ssss[QUAD_SIZE])
{
   GLuint *dst = (GLuint *) sps->surface.region->map + y * sps->surface.region->pitch + x;

   assert(sps->surface.format == PIPE_FORMAT_Z24_S8);

   dst[0] = (dst[0] & 0xffffff00) | ssss[0];
   dst[1] = (dst[1] & 0xffffff00) | ssss[1];
   dst += sps->surface.region->pitch;
   dst[0] = (dst[0] & 0xffffff00) | ssss[2];
   dst[1] = (dst[1] & 0xffffff00) | ssss[3];
}


static void
s8_read_quad_stencil(struct softpipe_surface *sps,
                     GLint x, GLint y, GLubyte ssss[QUAD_SIZE])
{
   const GLubyte *src
      = sps->surface.region->map + y * sps->surface.region->pitch + x;

   assert(sps->surface.format == PIPE_FORMAT_U_S8);

   ssss[0] = src[0];
   ssss[1] = src[1];
   src += sps->surface.region->pitch;
   ssss[2] = src[0];
   ssss[3] = src[1];
}

static void
s8_write_quad_stencil(struct softpipe_surface *sps,
                      GLint x, GLint y, const GLubyte ssss[QUAD_SIZE])
{
   GLubyte *dst
      = sps->surface.region->map + y * sps->surface.region->pitch + x;

   assert(sps->surface.format == PIPE_FORMAT_U_S8);

   dst[0] = ssss[0];
   dst[1] = ssss[1];
   dst += sps->surface.region->pitch;
   dst[0] = ssss[2];
   dst[1] = ssss[3];
}



static void
init_quad_funcs(struct softpipe_surface *sps)
{
   switch (sps->surface.format) {
   case PIPE_FORMAT_U_Z16:
      sps->read_quad_z = z16_read_quad_z;
      sps->write_quad_z = z16_write_quad_z;
      break;
   case PIPE_FORMAT_U_Z32:
      sps->read_quad_z = z32_read_quad_z;
      sps->write_quad_z = z32_write_quad_z;
      break;
   case PIPE_FORMAT_Z24_S8:
      sps->read_quad_z = z24s8_read_quad_z;
      sps->write_quad_z = z24s8_write_quad_z;
      sps->read_quad_stencil = z24s8_read_quad_stencil;
      sps->write_quad_stencil = z24s8_write_quad_stencil;
      break;
   case PIPE_FORMAT_U_S8:
      sps->read_quad_stencil = s8_read_quad_stencil;
      sps->write_quad_stencil = s8_write_quad_stencil;
      break;
   default:
      assert(0);
   }
}


static struct pipe_surface *
sp_surface_alloc(struct pipe_context *pipe, GLenum format)
{
   struct softpipe_surface *sps = CALLOC_STRUCT(softpipe_surface);
   if (!sps)
      return NULL;

   sps->surface.format = format;
   init_quad_funcs(sps);

   return &sps->surface;
}


void
sp_init_surface_functions(struct softpipe_context *sp)
{
   sp->pipe.surface_alloc = sp_surface_alloc;
}