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

 *

 * Copyright 2003 VMware, Inc.

 * 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 VMWARE 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 "main/mtypes.h"

#include "main/enums.h"

#include "main/colormac.h"

#include "main/macros.h"

#include "main/samplerobj.h"

#include "intel_mipmap_tree.h"

#include "intel_tex.h"

#include "i830_context.h"

#include "i830_reg.h"

#include "intel_chipset.h"

static GLuint

translate_texture_format(GLuint mesa_format)

{

   switch (mesa_format) {

   case MESA_FORMAT_L_UNORM8:

      return MAPSURF_8BIT | MT_8BIT_L8;

   case MESA_FORMAT_I_UNORM8:

      return MAPSURF_8BIT | MT_8BIT_I8;

   case MESA_FORMAT_L8A8_UNORM:

      return MAPSURF_16BIT | MT_16BIT_AY88;

   case MESA_FORMAT_B5G6R5_UNORM:

      return MAPSURF_16BIT | MT_16BIT_RGB565;

   case MESA_FORMAT_B5G5R5A1_UNORM:

      return MAPSURF_16BIT | MT_16BIT_ARGB1555;

   case MESA_FORMAT_B4G4R4A4_UNORM:

      return MAPSURF_16BIT | MT_16BIT_ARGB4444;

   case MESA_FORMAT_B8G8R8A8_UNORM:

      return MAPSURF_32BIT | MT_32BIT_ARGB8888;

   case MESA_FORMAT_B8G8R8X8_UNORM:

      return MAPSURF_32BIT | MT_32BIT_XRGB8888;

   case MESA_FORMAT_YCBCR_REV:

      return (MAPSURF_422 | MT_422_YCRCB_NORMAL);

   case MESA_FORMAT_YCBCR:

      return (MAPSURF_422 | MT_422_YCRCB_SWAPY);

   case MESA_FORMAT_RGB_FXT1:

   case MESA_FORMAT_RGBA_FXT1:

      return (MAPSURF_COMPRESSED | MT_COMPRESS_FXT1);

   case MESA_FORMAT_RGBA_DXT1:

   case MESA_FORMAT_RGB_DXT1:

      return (MAPSURF_COMPRESSED | MT_COMPRESS_DXT1);

   case MESA_FORMAT_RGBA_DXT3:

      return (MAPSURF_COMPRESSED | MT_COMPRESS_DXT2_3);

   case MESA_FORMAT_RGBA_DXT5:

      return (MAPSURF_COMPRESSED | MT_COMPRESS_DXT4_5);

   default:

      fprintf(stderr, "%s: bad image format %s\n", __func__,

	      _mesa_get_format_name(mesa_format));

      abort();

      return 0;

   }

}

/* The i915 (and related graphics cores) do not support GL_CLAMP.  The

 * Intel drivers for "other operating systems" implement GL_CLAMP as

 * GL_CLAMP_TO_EDGE, so the same is done here.

 */

static GLuint

translate_wrap_mode(GLenum wrap)

{

   switch (wrap) {

   case GL_REPEAT:

      return TEXCOORDMODE_WRAP;

   case GL_CLAMP:

   case GL_CLAMP_TO_EDGE:

      return TEXCOORDMODE_CLAMP;        /* not really correct */

   case GL_CLAMP_TO_BORDER:

      return TEXCOORDMODE_CLAMP_BORDER;

   case GL_MIRRORED_REPEAT:

      return TEXCOORDMODE_MIRROR;

   default:

      return TEXCOORDMODE_WRAP;

   }

}

/* Recalculate all state from scratch.  Perhaps not the most

 * efficient, but this has gotten complex enough that we need

 * something which is understandable and reliable.

 */

static bool

i830_update_tex_unit(struct intel_context *intel, GLuint unit, GLuint ss3)

{

   struct gl_context *ctx = &intel->ctx;

   struct i830_context *i830 = i830_context(ctx);

   struct gl_texture_unit *tUnit = &ctx->Texture.Unit[unit];

   struct gl_texture_object *tObj = tUnit->_Current;

   struct intel_texture_object *intelObj = intel_texture_object(tObj);

   struct gl_texture_image *firstImage;

   struct gl_sampler_object *sampler = _mesa_get_samplerobj(ctx, unit);

   GLuint *state = i830->state.Tex[unit], format, pitch;

   GLint lodbias;

   GLubyte border[4];

   GLuint dst_x, dst_y;

   memset(state, 0, sizeof(*state));

   /*We need to refcount these. */

   if (i830->state.tex_buffer[unit] != NULL) {

       drm_intel_bo_unreference(i830->state.tex_buffer[unit]);

       i830->state.tex_buffer[unit] = NULL;

   }

   if (!intel_finalize_mipmap_tree(intel, unit))

      return false;

   /* Get first image here, since intelObj->firstLevel will get set in

    * the intel_finalize_mipmap_tree() call above.

    */

   firstImage = tObj->Image[0][tObj->BaseLevel];

   intel_miptree_get_image_offset(intelObj->mt, tObj->BaseLevel, 0,

				  &dst_x, &dst_y);

   drm_intel_bo_reference(intelObj->mt->region->bo);

   i830->state.tex_buffer[unit] = intelObj->mt->region->bo;

   pitch = intelObj->mt->region->pitch;

   /* XXX: This calculation is probably broken for tiled images with

    * a non-page-aligned offset.

    */

   i830->state.tex_offset[unit] = dst_x * intelObj->mt->cpp + dst_y * pitch;

   format = translate_texture_format(firstImage->TexFormat);

   state[I830_TEXREG_TM0LI] = (_3DSTATE_LOAD_STATE_IMMEDIATE_2 |

                               (LOAD_TEXTURE_MAP0 << unit) | 4);

   state[I830_TEXREG_TM0S1] =

      (((firstImage->Height - 1) << TM0S1_HEIGHT_SHIFT) |

       ((firstImage->Width - 1) << TM0S1_WIDTH_SHIFT) | format);

   if (intelObj->mt->region->tiling != I915_TILING_NONE) {

      state[I830_TEXREG_TM0S1] |= TM0S1_TILED_SURFACE;

      if (intelObj->mt->region->tiling == I915_TILING_Y)

	 state[I830_TEXREG_TM0S1] |= TM0S1_TILE_WALK;

   }

   state[I830_TEXREG_TM0S2] =

      ((((pitch / 4) - 1) << TM0S2_PITCH_SHIFT) | TM0S2_CUBE_FACE_ENA_MASK);

   {

      if (tObj->Target == GL_TEXTURE_CUBE_MAP)

         state[I830_TEXREG_CUBE] = (_3DSTATE_MAP_CUBE | MAP_UNIT(unit) |

                                    CUBE_NEGX_ENABLE |

                                    CUBE_POSX_ENABLE |

                                    CUBE_NEGY_ENABLE |

                                    CUBE_POSY_ENABLE |

                                    CUBE_NEGZ_ENABLE | CUBE_POSZ_ENABLE);

      else

         state[I830_TEXREG_CUBE] = (_3DSTATE_MAP_CUBE | MAP_UNIT(unit));

   }

   {

      GLuint minFilt, mipFilt, magFilt;

      float maxlod;

      uint32_t minlod_fixed, maxlod_fixed;

      switch (sampler->MinFilter) {

      case GL_NEAREST:

         minFilt = FILTER_NEAREST;

         mipFilt = MIPFILTER_NONE;

         break;

      case GL_LINEAR:

         minFilt = FILTER_LINEAR;

         mipFilt = MIPFILTER_NONE;

         break;

      case GL_NEAREST_MIPMAP_NEAREST:

         minFilt = FILTER_NEAREST;

         mipFilt = MIPFILTER_NEAREST;

         break;

      case GL_LINEAR_MIPMAP_NEAREST:

         minFilt = FILTER_LINEAR;

         mipFilt = MIPFILTER_NEAREST;

         break;

      case GL_NEAREST_MIPMAP_LINEAR:

         minFilt = FILTER_NEAREST;

         mipFilt = MIPFILTER_LINEAR;

         break;

      case GL_LINEAR_MIPMAP_LINEAR:

         minFilt = FILTER_LINEAR;

         mipFilt = MIPFILTER_LINEAR;

         break;

      default:

         return false;

      }

      if (sampler->MaxAnisotropy > 1.0) {

         minFilt = FILTER_ANISOTROPIC;

         magFilt = FILTER_ANISOTROPIC;

         /* no trilinear + anisotropic */

         mipFilt = MIPFILTER_NEAREST;

      }

      else {

         switch (sampler->MagFilter) {

         case GL_NEAREST:

            magFilt = FILTER_NEAREST;

            break;

         case GL_LINEAR:

            magFilt = FILTER_LINEAR;

            break;

         default:

            return false;

         }

      }

      lodbias = (int) ((tUnit->LodBias + sampler->LodBias) * 16.0);

      if (lodbias < -64)

          lodbias = -64;

      if (lodbias > 63)

          lodbias = 63;

      state[I830_TEXREG_TM0S3] = ((lodbias << TM0S3_LOD_BIAS_SHIFT) &

                                  TM0S3_LOD_BIAS_MASK);

#if 0

      /* YUV conversion:

       */

      if (firstImage->TexFormat->MesaFormat == MESA_FORMAT_YCBCR ||

          firstImage->TexFormat->MesaFormat == MESA_FORMAT_YCBCR_REV)

         state[I830_TEXREG_TM0S3] |= SS2_COLORSPACE_CONVERSION;

#endif

      /* We get one field with fraction bits for the maximum

       * addressable (smallest resolution) LOD.  Use it to cover both

       * MAX_LEVEL and MAX_LOD.

       */

      minlod_fixed = U_FIXED(CLAMP(sampler->MinLod, 0.0, 11), 4);

      maxlod = MIN2(sampler->MaxLod, tObj->_MaxLevel - tObj->BaseLevel);

      if (intel->intelScreen->deviceID == PCI_CHIP_I855_GM ||

	  intel->intelScreen->deviceID == PCI_CHIP_I865_G) {

	 maxlod_fixed = U_FIXED(CLAMP(maxlod, 0.0, 11.75), 2);

	 maxlod_fixed = MAX2(maxlod_fixed, (minlod_fixed + 3) >> 2);

	 state[I830_TEXREG_TM0S3] |= maxlod_fixed << TM0S3_MIN_MIP_SHIFT;

	 state[I830_TEXREG_TM0S2] |= TM0S2_LOD_PRECLAMP;

      } else {

	 maxlod_fixed = U_FIXED(CLAMP(maxlod, 0.0, 11), 0);

	 maxlod_fixed = MAX2(maxlod_fixed, (minlod_fixed + 15) >> 4);

	 state[I830_TEXREG_TM0S3] |= maxlod_fixed << TM0S3_MIN_MIP_SHIFT_830;

      }

      state[I830_TEXREG_TM0S3] |= minlod_fixed << TM0S3_MAX_MIP_SHIFT;

      state[I830_TEXREG_TM0S3] |= ((minFilt << TM0S3_MIN_FILTER_SHIFT) |

                                   (mipFilt << TM0S3_MIP_FILTER_SHIFT) |

                                   (magFilt << TM0S3_MAG_FILTER_SHIFT));

   }

   {

      GLenum ws = sampler->WrapS;

      GLenum wt = sampler->WrapT;

      /* 3D textures not available on i830

       */

      if (tObj->Target == GL_TEXTURE_3D)

         return false;

      state[I830_TEXREG_MCS] = (_3DSTATE_MAP_COORD_SET_CMD |

                                MAP_UNIT(unit) |

                                ENABLE_TEXCOORD_PARAMS |

                                ss3 |

                                ENABLE_ADDR_V_CNTL |

                                TEXCOORD_ADDR_V_MODE(translate_wrap_mode(wt))

                                | ENABLE_ADDR_U_CNTL |

                                TEXCOORD_ADDR_U_MODE(translate_wrap_mode

                                                     (ws)));

   }

   /* convert border color from float to ubyte */

   CLAMPED_FLOAT_TO_UBYTE(border[0], sampler->BorderColor.f[0]);

   CLAMPED_FLOAT_TO_UBYTE(border[1], sampler->BorderColor.f[1]);

   CLAMPED_FLOAT_TO_UBYTE(border[2], sampler->BorderColor.f[2]);

   CLAMPED_FLOAT_TO_UBYTE(border[3], sampler->BorderColor.f[3]);

   state[I830_TEXREG_TM0S4] = PACK_COLOR_8888(border[3],

					      border[0],

					      border[1],

					      border[2]);

   I830_ACTIVESTATE(i830, I830_UPLOAD_TEX(unit), true);

   /* memcmp was already disabled, but definitely won't work as the

    * region might now change and that wouldn't be detected:

    */

   I830_STATECHANGE(i830, I830_UPLOAD_TEX(unit));

   return true;

}

void

i830UpdateTextureState(struct intel_context *intel)

{

   struct i830_context *i830 = i830_context(&intel->ctx);

   bool ok = true;

   GLuint i;

   for (i = 0; i < I830_TEX_UNITS && ok; i++) {

      if (intel->ctx.Texture.Unit[i]._Current) {

         switch (intel->ctx.Texture.Unit[i]._Current->Target) {

         case GL_TEXTURE_1D:

         case GL_TEXTURE_2D:

         case GL_TEXTURE_CUBE_MAP:

            ok = i830_update_tex_unit(intel, i, TEXCOORDS_ARE_NORMAL);

            break;

         case GL_TEXTURE_RECTANGLE:

            ok = i830_update_tex_unit(intel, i, TEXCOORDS_ARE_IN_TEXELUNITS);

            break;

         case GL_TEXTURE_3D:

         default:

            ok = false;

            break;

         }

      } else {

         struct i830_context *i830 = i830_context(&intel->ctx);

         if (i830->state.active & I830_UPLOAD_TEX(i))

            I830_ACTIVESTATE(i830, I830_UPLOAD_TEX(i), false);

         if (i830->state.tex_buffer[i] != NULL) {

            drm_intel_bo_unreference(i830->state.tex_buffer[i]);

            i830->state.tex_buffer[i] = NULL;

         }

      }

   }

   FALLBACK(intel, I830_FALLBACK_TEXTURE, !ok);

   if (ok)

      i830EmitTextureBlend(i830);

}