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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/macros.h"

#include "main/colormac.h"

#include "main/samplerobj.h"

#include "intel_mipmap_tree.h"

#include "intel_tex.h"

#include "i915_context.h"

#include "i915_reg.h"

static GLuint

translate_texture_format(mesa_format mesa_format, GLenum DepthMode)

{

   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_A_UNORM8:

      return MAPSURF_8BIT | MT_8BIT_A8;

   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_SRGB:

   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_R8G8B8A8_UNORM:

      return MAPSURF_32BIT | MT_32BIT_ABGR8888;

   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_Z_UNORM16:

      if (DepthMode == GL_ALPHA)

          return (MAPSURF_16BIT | MT_16BIT_A16);

      else if (DepthMode == GL_INTENSITY)

          return (MAPSURF_16BIT | MT_16BIT_I16);

      else

          return (MAPSURF_16BIT | MT_16BIT_L16);

   case MESA_FORMAT_RGBA_DXT1:

   case MESA_FORMAT_RGB_DXT1:

   case MESA_FORMAT_SRGB_DXT1:

   case MESA_FORMAT_SRGBA_DXT1:

      return (MAPSURF_COMPRESSED | MT_COMPRESS_DXT1);

   case MESA_FORMAT_RGBA_DXT3:

   case MESA_FORMAT_SRGBA_DXT3:

      return (MAPSURF_COMPRESSED | MT_COMPRESS_DXT2_3);

   case MESA_FORMAT_RGBA_DXT5:

   case MESA_FORMAT_SRGBA_DXT5:

      return (MAPSURF_COMPRESSED | MT_COMPRESS_DXT4_5);

   case MESA_FORMAT_Z24_UNORM_S8_UINT:

   case MESA_FORMAT_Z24_UNORM_X8_UINT:

      if (DepthMode == GL_ALPHA)

	 return (MAPSURF_32BIT | MT_32BIT_x8A24);

      else if (DepthMode == GL_INTENSITY)

	 return (MAPSURF_32BIT | MT_32BIT_x8I24);

      else

	 return (MAPSURF_32BIT | MT_32BIT_x8L24);

   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:

      return TEXCOORDMODE_CLAMP_EDGE;   /* not quite correct */

   case GL_CLAMP_TO_EDGE:

      return TEXCOORDMODE_CLAMP_EDGE;

   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

i915_update_tex_unit(struct intel_context *intel, GLuint unit, GLuint ss3)

{

   struct gl_context *ctx = &intel->ctx;

   struct i915_context *i915 = i915_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 = i915->state.Tex[unit], format;

   GLint lodbias, aniso = 0;

   GLubyte border[4];

   GLfloat maxlod;

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

   /*We need to refcount these. */

   if (i915->state.tex_buffer[unit] != NULL) {

       drm_intel_bo_unreference(i915->state.tex_buffer[unit]);

       i915->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];

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

   i915->state.tex_buffer[unit] = intelObj->mt->region->bo;

   i915->state.tex_offset[unit] = intelObj->mt->offset;

   format = translate_texture_format(firstImage->TexFormat,

				     tObj->DepthMode);

   state[I915_TEXREG_MS3] =

      (((firstImage->Height - 1) << MS3_HEIGHT_SHIFT) |

       ((firstImage->Width - 1) << MS3_WIDTH_SHIFT) | format);

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

      state[I915_TEXREG_MS3] |= MS3_TILED_SURFACE;

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

	 state[I915_TEXREG_MS3] |= MS3_TILE_WALK;

   }

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

    * (lowest resolution) LOD.  Use it to cover both MAX_LEVEL and

    * MAX_LOD.

    */

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

   state[I915_TEXREG_MS4] =

      ((((intelObj->mt->region->pitch / 4) - 1) << MS4_PITCH_SHIFT) |

       MS4_CUBE_FACE_ENA_MASK |

       (U_FIXED(CLAMP(maxlod, 0.0, 11.0), 2) << MS4_MAX_LOD_SHIFT) |

       ((firstImage->Depth - 1) << MS4_VOLUME_DEPTH_SHIFT));

   {

      GLuint minFilt, mipFilt, magFilt;

      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;

         if (sampler->MaxAnisotropy > 2.0)

            aniso = SS2_MAX_ANISO_4;

         else

            aniso = SS2_MAX_ANISO_2;

      }

      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 < -256)

          lodbias = -256;

      if (lodbias > 255)

          lodbias = 255;

      state[I915_TEXREG_SS2] = ((lodbias << SS2_LOD_BIAS_SHIFT) &

                                SS2_LOD_BIAS_MASK);

      /* YUV conversion:

       */

      if (firstImage->TexFormat == MESA_FORMAT_YCBCR ||

          firstImage->TexFormat == MESA_FORMAT_YCBCR_REV)

         state[I915_TEXREG_SS2] |= SS2_COLORSPACE_CONVERSION;

      /* Shadow:

       */

      if (sampler->CompareMode == GL_COMPARE_R_TO_TEXTURE_ARB &&

          tObj->Target != GL_TEXTURE_3D) {

         if (tObj->Target == GL_TEXTURE_1D)

            return false;

         state[I915_TEXREG_SS2] |=

            (SS2_SHADOW_ENABLE |

             intel_translate_shadow_compare_func(sampler->CompareFunc));

         minFilt = FILTER_4X4_FLAT;

         magFilt = FILTER_4X4_FLAT;

      }

      state[I915_TEXREG_SS2] |= ((minFilt << SS2_MIN_FILTER_SHIFT) |

                                 (mipFilt << SS2_MIP_FILTER_SHIFT) |

                                 (magFilt << SS2_MAG_FILTER_SHIFT) |

                                 aniso);

   }

   {

      GLenum ws = sampler->WrapS;

      GLenum wt = sampler->WrapT;

      GLenum wr = sampler->WrapR;

      float minlod;

      /* We program 1D textures as 2D textures, so the 2D texcoord could

       * result in sampling border values if we don't set the T wrap to

       * repeat.

       */

      if (tObj->Target == GL_TEXTURE_1D)

	 wt = GL_REPEAT;

      /* 3D textures don't seem to respect the border color.

       * Fallback if there's ever a danger that they might refer to

       * it.

       *

       * Effectively this means fallback on 3D clamp or

       * clamp_to_border.

       */

      if (tObj->Target == GL_TEXTURE_3D &&

          (sampler->MinFilter != GL_NEAREST ||

           sampler->MagFilter != GL_NEAREST) &&

          (ws == GL_CLAMP ||

           wt == GL_CLAMP ||

           wr == GL_CLAMP ||

           ws == GL_CLAMP_TO_BORDER ||

           wt == GL_CLAMP_TO_BORDER || wr == GL_CLAMP_TO_BORDER))

         return false;

      /* Only support TEXCOORDMODE_CLAMP_EDGE and TEXCOORDMODE_CUBE (not

       * used) when using cube map texture coordinates

       */

      if (tObj->Target == GL_TEXTURE_CUBE_MAP_ARB &&

          (((ws != GL_CLAMP) && (ws != GL_CLAMP_TO_EDGE)) ||

           ((wt != GL_CLAMP) && (wt != GL_CLAMP_TO_EDGE))))

          return false;

      /*

       * According to 3DSTATE_MAP_STATE at page of 104 in Bspec

       * Vol3d 3D Instructions:

       *   [DevGDG and DevAlv]: Must be a power of 2 for cube maps.

       *   [DevLPT, DevCST and DevBLB]: If not a power of 2, cube maps

       *      must have all faces enabled.

       *

       * But, as I tested on pineview(DevBLB derived), the rendering is

       * bad(you will find the color isn't samplered right in some

       * fragments). After checking, it seems that the texture layout is

       * wrong: making the width and height align of 4(although this

       * doesn't make much sense) will fix this issue and also broke some

       * others. Well, Bspec mentioned nothing about the layout alignment

       * and layout for NPOT cube map.  I guess the Bspec just assume it's

       * a POT cube map.

       *

       * Thus, I guess we need do this for other platforms as well.

       */

      if (tObj->Target == GL_TEXTURE_CUBE_MAP_ARB &&

          !is_power_of_two(firstImage->Height))

         return false;

      state[I915_TEXREG_SS3] = ss3;     /* SS3_NORMALIZED_COORDS */

      state[I915_TEXREG_SS3] |=

         ((translate_wrap_mode(ws) << SS3_TCX_ADDR_MODE_SHIFT) |

          (translate_wrap_mode(wt) << SS3_TCY_ADDR_MODE_SHIFT) |

          (translate_wrap_mode(wr) << SS3_TCZ_ADDR_MODE_SHIFT));

      minlod = MIN2(sampler->MinLod, tObj->_MaxLevel - tObj->BaseLevel);

      state[I915_TEXREG_SS3] |= (unit << SS3_TEXTUREMAP_INDEX_SHIFT);

      state[I915_TEXREG_SS3] |= (U_FIXED(CLAMP(minlod, 0.0, 11.0), 4) <<

				 SS3_MIN_LOD_SHIFT);

   }

   if (sampler->sRGBDecode == GL_DECODE_EXT &&

       (_mesa_get_srgb_format_linear(firstImage->TexFormat) !=

        firstImage->TexFormat)) {

      state[I915_TEXREG_SS2] |= SS2_REVERSE_GAMMA_ENABLE;

   }

   /* 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]);

   if (firstImage->_BaseFormat == GL_DEPTH_COMPONENT) {

      /* GL specs that border color for depth textures is taken from the

       * R channel, while the hardware uses A.  Spam R into all the channels

       * for safety.

       */

      state[I915_TEXREG_SS4] = PACK_COLOR_8888(border[0],

					       border[0],

					       border[0],

					       border[0]);

   } else {

      state[I915_TEXREG_SS4] = PACK_COLOR_8888(border[3],

					       border[0],

					       border[1],

					       border[2]);

   }

   I915_ACTIVESTATE(i915, I915_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:

    */

   I915_STATECHANGE(i915, I915_UPLOAD_TEX(unit));

#if 0

   DBG(TEXTURE, "state[I915_TEXREG_SS2] = 0x%x\n", state[I915_TEXREG_SS2]);

   DBG(TEXTURE, "state[I915_TEXREG_SS3] = 0x%x\n", state[I915_TEXREG_SS3]);

   DBG(TEXTURE, "state[I915_TEXREG_SS4] = 0x%x\n", state[I915_TEXREG_SS4]);

   DBG(TEXTURE, "state[I915_TEXREG_MS2] = 0x%x\n", state[I915_TEXREG_MS2]);

   DBG(TEXTURE, "state[I915_TEXREG_MS3] = 0x%x\n", state[I915_TEXREG_MS3]);

   DBG(TEXTURE, "state[I915_TEXREG_MS4] = 0x%x\n", state[I915_TEXREG_MS4]);

#endif

   return true;

}

void

i915UpdateTextureState(struct intel_context *intel)

{

   bool ok = true;

   GLuint i;

   for (i = 0; i < I915_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:

         case GL_TEXTURE_3D:

            ok = i915_update_tex_unit(intel, i, SS3_NORMALIZED_COORDS);

            break;

         case GL_TEXTURE_RECTANGLE:

            ok = i915_update_tex_unit(intel, i, 0);

            break;

         default:

            ok = false;

            break;

         }

      } else {

         struct i915_context *i915 = i915_context(&intel->ctx);

         if (i915->state.active & I915_UPLOAD_TEX(i))

            I915_ACTIVESTATE(i915, I915_UPLOAD_TEX(i), false);

         if (i915->state.tex_buffer[i] != NULL) {

            drm_intel_bo_unreference(i915->state.tex_buffer[i]);

            i915->state.tex_buffer[i] = NULL;

         }

      }

   }

   FALLBACK(intel, I915_FALLBACK_TEXTURE, !ok);

}