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

 *

 * Copyright 2007 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.

 *

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

 /*

  * Authors:

  *   Brian Paul

  */

#include "main/imports.h"

#include "main/image.h"

#include "main/bufferobj.h"

#include "main/macros.h"

#include "main/pack.h"

#include "main/texformat.h"

#include "main/texstore.h"

#include "program/program.h"

#include "program/prog_print.h"

#include "program/prog_instruction.h"

#include "st_atom.h"

#include "st_atom_constbuf.h"

#include "st_cb_drawpixels.h"

#include "st_cb_readpixels.h"

#include "st_cb_fbo.h"

#include "st_context.h"

#include "st_debug.h"

#include "st_format.h"

#include "st_program.h"

#include "st_texture.h"

#include "pipe/p_context.h"

#include "pipe/p_defines.h"

#include "tgsi/tgsi_ureg.h"

#include "util/u_draw_quad.h"

#include "util/u_format.h"

#include "util/u_inlines.h"

#include "util/u_math.h"

#include "util/u_tile.h"

#include "cso_cache/cso_context.h"

#if FEATURE_drawpix

/**

 * Check if the given program is:

 * 0: MOVE result.color, fragment.color;

 * 1: END;

 */

static GLboolean

is_passthrough_program(const struct gl_fragment_program *prog)

{

   if (prog->Base.NumInstructions == 2) {

      const struct prog_instruction *inst = prog->Base.Instructions;

      if (inst[0].Opcode == OPCODE_MOV &&

          inst[1].Opcode == OPCODE_END &&

          inst[0].DstReg.File == PROGRAM_OUTPUT &&

          inst[0].DstReg.Index == FRAG_RESULT_COLOR &&

          inst[0].DstReg.WriteMask == WRITEMASK_XYZW &&

          inst[0].SrcReg[0].File == PROGRAM_INPUT &&

          inst[0].SrcReg[0].Index == FRAG_ATTRIB_COL0 &&

          inst[0].SrcReg[0].Swizzle == SWIZZLE_XYZW) {

         return GL_TRUE;

      }

   }

   return GL_FALSE;

}

/**

 * Make fragment shader for glDraw/CopyPixels.  This shader is made

 * by combining the pixel transfer shader with the user-defined shader.

 * \return pointer to Gallium driver fragment shader

 */

static void *

combined_drawpix_fragment_program(struct gl_context *ctx)

{

   struct st_context *st = st_context(ctx);

   struct st_fragment_program *stfp;

   if (st->pixel_xfer.program->serialNo == st->pixel_xfer.xfer_prog_sn

       && st->fp->serialNo == st->pixel_xfer.user_prog_sn) {

      /* the pixel tranfer program has not changed and the user-defined

       * program has not changed, so re-use the combined program.

       */

      stfp = st->pixel_xfer.combined_prog;

   }

   else {

      /* Concatenate the pixel transfer program with the current user-

       * defined program.

       */

      if (is_passthrough_program(&st->fp->Base)) {

         stfp = (struct st_fragment_program *)

            _mesa_clone_fragment_program(ctx, &st->pixel_xfer.program->Base);

      }

      else {

#if 0

         printf("Base program:\n");

         _mesa_print_program(&st->fp->Base.Base);

         printf("DrawPix program:\n");

         _mesa_print_program(&st->pixel_xfer.program->Base.Base);

#endif

         stfp = (struct st_fragment_program *)

            _mesa_combine_programs(ctx,

                                   &st->pixel_xfer.program->Base.Base,

                                   &st->fp->Base.Base);

      }

#if 0

      {

         struct gl_program *p = &stfp->Base.Base;

         printf("Combined DrawPixels program:\n");

         _mesa_print_program(p);

         printf("InputsRead: 0x%x\n", p->InputsRead);

         printf("OutputsWritten: 0x%x\n", p->OutputsWritten);

         _mesa_print_parameter_list(p->Parameters);

      }

#endif

      /* translate to TGSI tokens */

      st_translate_fragment_program(st, stfp);

      /* save new program, update serial numbers */

      st->pixel_xfer.xfer_prog_sn = st->pixel_xfer.program->serialNo;

      st->pixel_xfer.user_prog_sn = st->fp->serialNo;

      st->pixel_xfer.combined_prog_sn = stfp->serialNo;

      /* can't reference new program directly, already have a reference on it */

      st_reference_fragprog(st, &st->pixel_xfer.combined_prog, NULL);

      st->pixel_xfer.combined_prog = stfp;

   }

   /* Ideally we'd have updated the pipe constants during the normal

    * st/atom mechanism.  But we can't since this is specific to glDrawPixels.

    */

   st_upload_constants(st, stfp->Base.Base.Parameters, PIPE_SHADER_FRAGMENT);

   return stfp->driver_shader;

}

/**

 * Create fragment shader that does a TEX() instruction to get a Z and/or

 * stencil value value, then writes to FRAG_RESULT_DEPTH/FRAG_RESULT_STENCIL.

 * Used for glDrawPixels(GL_DEPTH_COMPONENT / GL_STENCIL_INDEX).

 * Pass fragment color through as-is.

 * \return pointer to the Gallium driver fragment shader

 */

static void *

make_fragment_shader_z_stencil(struct st_context *st, GLboolean write_depth,

                               GLboolean write_stencil)

{

   struct gl_context *ctx = st->ctx;

   struct gl_program *p;

   struct st_fragment_program *stp;

   GLuint ic = 0;

   const GLuint shaderIndex = write_depth * 2 + write_stencil;

   assert(shaderIndex < Elements(st->drawpix.shaders));

   if (st->drawpix.shaders[shaderIndex]) {

      /* already have the proper shader */

      return st->drawpix.shaders[shaderIndex]->driver_shader;

   }

   /*

    * Create shader now

    */

   p = ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);

   if (!p)

      return NULL;

   p->NumInstructions = write_depth ? 2 : 1;

   p->NumInstructions += write_stencil ? 1 : 0;

   p->Instructions = _mesa_alloc_instructions(p->NumInstructions);

   if (!p->Instructions) {

      ctx->Driver.DeleteProgram(ctx, p);

      return NULL;

   }

   _mesa_init_instructions(p->Instructions, p->NumInstructions);

   if (write_depth) {

      /* TEX result.depth, fragment.texcoord[0], texture[0], 2D; */

      p->Instructions[ic].Opcode = OPCODE_TEX;

      p->Instructions[ic].DstReg.File = PROGRAM_OUTPUT;

      p->Instructions[ic].DstReg.Index = FRAG_RESULT_DEPTH;

      p->Instructions[ic].DstReg.WriteMask = WRITEMASK_Z;

      p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;

      p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;

      p->Instructions[ic].TexSrcUnit = 0;

      p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;

      ic++;

   }

   if (write_stencil) {

      /* TEX result.stencil, fragment.texcoord[0], texture[0], 2D; */

      p->Instructions[ic].Opcode = OPCODE_TEX;

      p->Instructions[ic].DstReg.File = PROGRAM_OUTPUT;

      p->Instructions[ic].DstReg.Index = FRAG_RESULT_STENCIL;

      p->Instructions[ic].DstReg.WriteMask = WRITEMASK_Y;

      p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;

      p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;

      p->Instructions[ic].TexSrcUnit = 1;

      p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;

      ic++;

   }

   /* END; */

   p->Instructions[ic++].Opcode = OPCODE_END;

   assert(ic == p->NumInstructions);

   p->InputsRead = FRAG_BIT_TEX0 | FRAG_BIT_COL0;

   p->OutputsWritten = 0;

   if (write_depth)

      p->OutputsWritten |= (1 << FRAG_RESULT_DEPTH);

   if (write_stencil)

      p->OutputsWritten |= (1 << FRAG_RESULT_STENCIL);

   p->SamplersUsed =  0x1;  /* sampler 0 (bit 0) is used */

   if (write_stencil)

      p->SamplersUsed |= 1 << 1;

   stp = st_fragment_program((struct gl_fragment_program *) p);

   /* save the new shader */

   st->drawpix.shaders[shaderIndex] = stp;

   st_translate_fragment_program(st, stp);

   return stp->driver_shader;

}

/**

 * Create a simple vertex shader that just passes through the

 * vertex position and texcoord (and optionally, color).

 */

static void *

make_passthrough_vertex_shader(struct st_context *st,

                               GLboolean passColor)

{

   if (!st->drawpix.vert_shaders[passColor]) {

      struct ureg_program *ureg = ureg_create( TGSI_PROCESSOR_VERTEX );

      if (ureg == NULL)

         return NULL;

      /* MOV result.pos, vertex.pos; */

      ureg_MOV(ureg,

               ureg_DECL_output( ureg, TGSI_SEMANTIC_POSITION, 0 ),

               ureg_DECL_vs_input( ureg, 0 ));

      /* MOV result.texcoord0, vertex.attr[1]; */

      ureg_MOV(ureg,

               ureg_DECL_output( ureg, TGSI_SEMANTIC_GENERIC, 0 ),

               ureg_DECL_vs_input( ureg, 1 ));

      if (passColor) {

         /* MOV result.color0, vertex.attr[2]; */

         ureg_MOV(ureg,

                  ureg_DECL_output( ureg, TGSI_SEMANTIC_COLOR, 0 ),

                  ureg_DECL_vs_input( ureg, 2 ));

      }

      ureg_END( ureg );

      st->drawpix.vert_shaders[passColor] =

         ureg_create_shader_and_destroy( ureg, st->pipe );

   }

   return st->drawpix.vert_shaders[passColor];

}

/**

 * Return a texture base format for drawing/copying an image

 * of the given format.

 */

static GLenum

base_format(GLenum format)

{

   switch (format) {

   case GL_DEPTH_COMPONENT:

      return GL_DEPTH_COMPONENT;

   case GL_DEPTH_STENCIL:

      return GL_DEPTH_STENCIL;

   case GL_STENCIL_INDEX:

      return GL_STENCIL_INDEX;

   default:

      return GL_RGBA;

   }

}

/**

 * Return a texture internalFormat for drawing/copying an image

 * of the given format and type.

 */

static GLenum

internal_format(GLenum format, GLenum type)

{

   switch (format) {

   case GL_DEPTH_COMPONENT:

      return GL_DEPTH_COMPONENT;

   case GL_DEPTH_STENCIL:

      return GL_DEPTH_STENCIL;

   case GL_STENCIL_INDEX:

      return GL_STENCIL_INDEX;

   default:

      if (_mesa_is_integer_format(format)) {

         switch (type) {

         case GL_BYTE:

            return GL_RGBA8I;

         case GL_UNSIGNED_BYTE:

            return GL_RGBA8UI;

         case GL_SHORT:

            return GL_RGBA16I;

         case GL_UNSIGNED_SHORT:

            return GL_RGBA16UI;

         case GL_INT:

            return GL_RGBA32I;

         case GL_UNSIGNED_INT:

            return GL_RGBA32UI;

         default:

            assert(0 && "Unexpected type in internal_format()");

            return GL_RGBA_INTEGER;

         }

      }

      else {

         return GL_RGBA;

      }

   }

}

/**

 * Create a temporary texture to hold an image of the given size.

 * If width, height are not POT and the driver only handles POT textures,

 * allocate the next larger size of texture that is POT.

 */

static struct pipe_resource *

alloc_texture(struct st_context *st, GLsizei width, GLsizei height,

              enum pipe_format texFormat)

{

   struct pipe_resource *pt;

   pt = st_texture_create(st, st->internal_target, texFormat, 0,

                          width, height, 1, PIPE_BIND_SAMPLER_VIEW);

   return pt;

}

/**

 * Make texture containing an image for glDrawPixels image.

 * If 'pixels' is NULL, leave the texture image data undefined.

 */

static struct pipe_resource *

make_texture(struct st_context *st,

	     GLsizei width, GLsizei height, GLenum format, GLenum type,

	     const struct gl_pixelstore_attrib *unpack,

	     const GLvoid *pixels)

{

   struct gl_context *ctx = st->ctx;

   struct pipe_context *pipe = st->pipe;

   gl_format mformat;

   struct pipe_resource *pt;

   enum pipe_format pipeFormat;

   GLuint cpp;

   GLenum baseFormat, intFormat;

   baseFormat = base_format(format);

   intFormat = internal_format(format, type);

   mformat = st_ChooseTextureFormat_renderable(ctx, intFormat,

                                               format, type, GL_FALSE);

   assert(mformat);

   pipeFormat = st_mesa_format_to_pipe_format(mformat);

   assert(pipeFormat);

   cpp = util_format_get_blocksize(pipeFormat);

   pixels = _mesa_map_pbo_source(ctx, unpack, pixels);

   if (!pixels)

      return NULL;

   /* alloc temporary texture */

   pt = alloc_texture(st, width, height, pipeFormat);

   if (!pt) {

      _mesa_unmap_pbo_source(ctx, unpack);

      return NULL;

   }

   {

      struct pipe_transfer *transfer;

      static const GLuint dstImageOffsets = 0;

      GLboolean success;

      GLubyte *dest;

      const GLbitfield imageTransferStateSave = ctx->_ImageTransferState;

      /* we'll do pixel transfer in a fragment shader */

      ctx->_ImageTransferState = 0x0;

      transfer = pipe_get_transfer(st->pipe, pt, 0, 0,

                                   PIPE_TRANSFER_WRITE, 0, 0,

                                   width, height);

      /* map texture transfer */

      dest = pipe_transfer_map(pipe, transfer);

      /* Put image into texture transfer.

       * Note that the image is actually going to be upside down in

       * the texture.  We deal with that with texcoords.

       */

      success = _mesa_texstore(ctx, 2,           /* dims */

                               baseFormat,       /* baseInternalFormat */

                               mformat,          /* gl_format */

                               dest,             /* dest */

                               0, 0, 0,          /* dstX/Y/Zoffset */

                               transfer->stride, /* dstRowStride, bytes */

                               &dstImageOffsets, /* dstImageOffsets */

                               width, height, 1, /* size */

                               format, type,     /* src format/type */

                               pixels,           /* data source */

                               unpack);

      /* unmap */

      pipe_transfer_unmap(pipe, transfer);

      pipe->transfer_destroy(pipe, transfer);

      assert(success);

      /* restore */

      ctx->_ImageTransferState = imageTransferStateSave;

   }

   _mesa_unmap_pbo_source(ctx, unpack);

   return pt;

}

/**

 * Draw quad with texcoords and optional color.

 * Coords are gallium window coords with y=0=top.

 * \param color  may be null

 * \param invertTex  if true, flip texcoords vertically

 */

static void

draw_quad(struct gl_context *ctx, GLfloat x0, GLfloat y0, GLfloat z,

          GLfloat x1, GLfloat y1, const GLfloat *color,

          GLboolean invertTex, GLfloat maxXcoord, GLfloat maxYcoord)

{

   struct st_context *st = st_context(ctx);

   struct pipe_context *pipe = st->pipe;

   GLfloat verts[4][3][4]; /* four verts, three attribs, XYZW */

   /* setup vertex data */

   {

      const struct gl_framebuffer *fb = st->ctx->DrawBuffer;

      const GLfloat fb_width = (GLfloat) fb->Width;

      const GLfloat fb_height = (GLfloat) fb->Height;

      const GLfloat clip_x0 = x0 / fb_width * 2.0f - 1.0f;

      const GLfloat clip_y0 = y0 / fb_height * 2.0f - 1.0f;

      const GLfloat clip_x1 = x1 / fb_width * 2.0f - 1.0f;

      const GLfloat clip_y1 = y1 / fb_height * 2.0f - 1.0f;

      const GLfloat sLeft = 0.0f, sRight = maxXcoord;

      const GLfloat tTop = invertTex ? maxYcoord : 0.0f;

      const GLfloat tBot = invertTex ? 0.0f : maxYcoord;

      GLuint i;

      /* upper-left */

      verts[0][0][0] = clip_x0;    /* v[0].attr[0].x */

      verts[0][0][1] = clip_y0;    /* v[0].attr[0].y */

      /* upper-right */

      verts[1][0][0] = clip_x1;

      verts[1][0][1] = clip_y0;

      /* lower-right */

      verts[2][0][0] = clip_x1;

      verts[2][0][1] = clip_y1;

      /* lower-left */

      verts[3][0][0] = clip_x0;

      verts[3][0][1] = clip_y1;

      verts[0][1][0] = sLeft; /* v[0].attr[1].S */

      verts[0][1][1] = tTop;  /* v[0].attr[1].T */

      verts[1][1][0] = sRight;

      verts[1][1][1] = tTop;

      verts[2][1][0] = sRight;

      verts[2][1][1] = tBot;

      verts[3][1][0] = sLeft;

      verts[3][1][1] = tBot;

      /* same for all verts: */

      if (color) {

         for (i = 0; i < 4; i++) {

            verts[i][0][2] = z;         /* v[i].attr[0].z */

            verts[i][0][3] = 1.0f;      /* v[i].attr[0].w */

            verts[i][2][0] = color[0];  /* v[i].attr[2].r */

            verts[i][2][1] = color[1];  /* v[i].attr[2].g */

            verts[i][2][2] = color[2];  /* v[i].attr[2].b */

            verts[i][2][3] = color[3];  /* v[i].attr[2].a */

            verts[i][1][2] = 0.0f;      /* v[i].attr[1].R */

            verts[i][1][3] = 1.0f;      /* v[i].attr[1].Q */

         }

      }

      else {

         for (i = 0; i < 4; i++) {

            verts[i][0][2] = z;    /*Z*/

            verts[i][0][3] = 1.0f; /*W*/

            verts[i][1][2] = 0.0f; /*R*/

            verts[i][1][3] = 1.0f; /*Q*/

         }

      }

   }

   {

      struct pipe_resource *buf;

      /* allocate/load buffer object with vertex data */

      buf = pipe_buffer_create(pipe->screen,

			       PIPE_BIND_VERTEX_BUFFER,

                               sizeof(verts));

      pipe_buffer_write(st->pipe, buf, 0, sizeof(verts), verts);

      util_draw_vertex_buffer(pipe, buf, 0,

                              PIPE_PRIM_QUADS,

                              4,  /* verts */

                              3); /* attribs/vert */

      pipe_resource_reference(&buf, NULL);

   }

}

static void

draw_textured_quad(struct gl_context *ctx, GLint x, GLint y, GLfloat z,

                   GLsizei width, GLsizei height,

                   GLfloat zoomX, GLfloat zoomY,

                   struct pipe_sampler_view **sv,

                   int num_sampler_view,

                   void *driver_vp,

                   void *driver_fp,

                   const GLfloat *color,

                   GLboolean invertTex,

                   GLboolean write_depth, GLboolean write_stencil)

{

   struct st_context *st = st_context(ctx);

   struct pipe_context *pipe = st->pipe;

   struct cso_context *cso = st->cso_context;

   GLfloat x0, y0, x1, y1;

   GLsizei maxSize;

   boolean normalized = sv[0]->texture->target != PIPE_TEXTURE_RECT;

   /* limit checks */

   /* XXX if DrawPixels image is larger than max texture size, break

    * it up into chunks.

    */

   maxSize = 1 << (pipe->screen->get_param(pipe->screen,

                                        PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);

   assert(width <= maxSize);

   assert(height <= maxSize);

   cso_save_rasterizer(cso);

   cso_save_viewport(cso);

   cso_save_samplers(cso);

   cso_save_fragment_sampler_views(cso);

   cso_save_fragment_shader(cso);

   cso_save_vertex_shader(cso);

   cso_save_vertex_elements(cso);

   if (write_stencil) {

      cso_save_depth_stencil_alpha(cso);

      cso_save_blend(cso);

   }

   /* rasterizer state: just scissor */

   {

      struct pipe_rasterizer_state rasterizer;

      memset(&rasterizer, 0, sizeof(rasterizer));

      rasterizer.gl_rasterization_rules = 1;

      rasterizer.scissor = ctx->Scissor.Enabled;

      cso_set_rasterizer(cso, &rasterizer);

   }

   if (write_stencil) {

      /* Stencil writing bypasses the normal fragment pipeline to

       * disable color writing and set stencil test to always pass.

       */

      struct pipe_depth_stencil_alpha_state dsa;

      struct pipe_blend_state blend;

      /* depth/stencil */

      memset(&dsa, 0, sizeof(dsa));

      dsa.stencil[0].enabled = 1;

      dsa.stencil[0].func = PIPE_FUNC_ALWAYS;

      dsa.stencil[0].writemask = ctx->Stencil.WriteMask[0] & 0xff;

      dsa.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;

      if (write_depth) {

         /* writing depth+stencil: depth test always passes */

         dsa.depth.enabled = 1;

         dsa.depth.writemask = ctx->Depth.Mask;

         dsa.depth.func = PIPE_FUNC_ALWAYS;

      }

      cso_set_depth_stencil_alpha(cso, &dsa);

      /* blend (colormask) */

      memset(&blend, 0, sizeof(blend));

      cso_set_blend(cso, &blend);

   }

   /* fragment shader state: TEX lookup program */

   cso_set_fragment_shader_handle(cso, driver_fp);

   /* vertex shader state: position + texcoord pass-through */

   cso_set_vertex_shader_handle(cso, driver_vp);

   /* texture sampling state: */

   {

      struct pipe_sampler_state sampler;

      memset(&sampler, 0, sizeof(sampler));

      sampler.wrap_s = PIPE_TEX_WRAP_CLAMP;

      sampler.wrap_t = PIPE_TEX_WRAP_CLAMP;

      sampler.wrap_r = PIPE_TEX_WRAP_CLAMP;

      sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;

      sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;

      sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;

      sampler.normalized_coords = normalized;

      cso_single_sampler(cso, 0, &sampler);

      if (num_sampler_view > 1) {

         cso_single_sampler(cso, 1, &sampler);

      }

      cso_single_sampler_done(cso);

   }

   /* viewport state: viewport matching window dims */

   {

      const float w = (float) ctx->DrawBuffer->Width;

      const float h = (float) ctx->DrawBuffer->Height;

      struct pipe_viewport_state vp;

      vp.scale[0] =  0.5f * w;

      vp.scale[1] = -0.5f * h;

      vp.scale[2] = 0.5f;

      vp.scale[3] = 1.0f;

      vp.translate[0] = 0.5f * w;

      vp.translate[1] = 0.5f * h;

      vp.translate[2] = 0.5f;

      vp.translate[3] = 0.0f;

      cso_set_viewport(cso, &vp);

   }

   cso_set_vertex_elements(cso, 3, st->velems_util_draw);

   /* texture state: */

   cso_set_fragment_sampler_views(cso, num_sampler_view, sv);

   /* Compute Gallium window coords (y=0=top) with pixel zoom.

    * Recall that these coords are transformed by the current

    * vertex shader and viewport transformation.

    */

   if (st_fb_orientation(ctx->DrawBuffer) == Y_0_BOTTOM) {

      y = ctx->DrawBuffer->Height - (int) (y + height * ctx->Pixel.ZoomY);

      invertTex = !invertTex;

   }

   x0 = (GLfloat) x;

   x1 = x + width * ctx->Pixel.ZoomX;

   y0 = (GLfloat) y;

   y1 = y + height * ctx->Pixel.ZoomY;

   /* convert Z from [0,1] to [-1,-1] to match viewport Z scale/bias */

   z = z * 2.0 - 1.0;

   draw_quad(ctx, x0, y0, z, x1, y1, color, invertTex,

             normalized ? ((GLfloat) width / sv[0]->texture->width0) : (GLfloat)width,

             normalized ? ((GLfloat) height / sv[0]->texture->height0) : (GLfloat)height);

   /* restore state */

   cso_restore_rasterizer(cso);

   cso_restore_viewport(cso);

   cso_restore_samplers(cso);

   cso_restore_fragment_sampler_views(cso);

   cso_restore_fragment_shader(cso);

   cso_restore_vertex_shader(cso);

   cso_restore_vertex_elements(cso);

   if (write_stencil) {

      cso_restore_depth_stencil_alpha(cso);

      cso_restore_blend(cso);

   }

}

/**

 * Software fallback to do glDrawPixels(GL_STENCIL_INDEX) when we

 * can't use a fragment shader to write stencil values.

 */

static void

draw_stencil_pixels(struct gl_context *ctx, GLint x, GLint y,

                    GLsizei width, GLsizei height, GLenum format, GLenum type,

                    const struct gl_pixelstore_attrib *unpack,

                    const GLvoid *pixels)

{

   struct st_context *st = st_context(ctx);

   struct pipe_context *pipe = st->pipe;

   struct st_renderbuffer *strb;

   enum pipe_transfer_usage usage;

   struct pipe_transfer *pt;

   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;

   GLint skipPixels;

   ubyte *stmap;

   struct gl_pixelstore_attrib clippedUnpack = *unpack;

   if (!zoom) {

      if (!_mesa_clip_drawpixels(ctx, &x, &y, &width, &height,

                                 &clippedUnpack)) {

         /* totally clipped */

         return;

      }

   }

   strb = st_renderbuffer(ctx->DrawBuffer->

                          Attachment[BUFFER_STENCIL].Renderbuffer);

   if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {

      y = ctx->DrawBuffer->Height - y - height;

   }

   if(format != GL_DEPTH_STENCIL &&

      util_format_get_component_bits(strb->format,

                                     UTIL_FORMAT_COLORSPACE_ZS, 0) != 0)

      usage = PIPE_TRANSFER_READ_WRITE;

   else

      usage = PIPE_TRANSFER_WRITE;

   pt = pipe_get_transfer(st_context(ctx)->pipe, strb->texture, 0, 0,

                                     usage, x, y,

                                     width, height);

   stmap = pipe_transfer_map(pipe, pt);

   pixels = _mesa_map_pbo_source(ctx, &clippedUnpack, pixels);

   assert(pixels);

   /* if width > MAX_WIDTH, have to process image in chunks */

   skipPixels = 0;

   while (skipPixels < width) {

      const GLint spanX = skipPixels;

      const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);

      GLint row;

      for (row = 0; row < height; row++) {

         GLubyte sValues[MAX_WIDTH];

         GLuint zValues[MAX_WIDTH];

         GLenum destType = GL_UNSIGNED_BYTE;

         const GLvoid *source = _mesa_image_address2d(&clippedUnpack, pixels,

                                                      width, height,

                                                      format, type,

                                                      row, skipPixels);

         _mesa_unpack_stencil_span(ctx, spanWidth, destType, sValues,

                                   type, source, &clippedUnpack,

                                   ctx->_ImageTransferState);

         if (format == GL_DEPTH_STENCIL) {

            _mesa_unpack_depth_span(ctx, spanWidth, GL_UNSIGNED_INT, zValues,

                                    (1 << 24) - 1, type, source,

                                    &clippedUnpack);

         }

         if (zoom) {

            _mesa_problem(ctx, "Gallium glDrawPixels(GL_STENCIL) with "

                          "zoom not complete");

         }

         {

            GLint spanY;

            if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {

               spanY = height - row - 1;

            }

            else {

               spanY = row;

            }

            /* now pack the stencil (and Z) values in the dest format */

            switch (pt->resource->format) {

            case PIPE_FORMAT_S8_USCALED:

               {

                  ubyte *dest = stmap + spanY * pt->stride + spanX;

                  assert(usage == PIPE_TRANSFER_WRITE);

                  memcpy(dest, sValues, spanWidth);

               }

               break;

            case PIPE_FORMAT_Z24_UNORM_S8_USCALED:

               if (format == GL_DEPTH_STENCIL) {

                  uint *dest = (uint *) (stmap + spanY * pt->stride + spanX*4);

                  GLint k;

                  assert(usage == PIPE_TRANSFER_WRITE);

                  for (k = 0; k < spanWidth; k++) {

                     dest[k] = zValues[k] | (sValues[k] << 24);

                  }

               }

               else {

                  uint *dest = (uint *) (stmap + spanY * pt->stride + spanX*4);

                  GLint k;

                  assert(usage == PIPE_TRANSFER_READ_WRITE);

                  for (k = 0; k < spanWidth; k++) {

                     dest[k] = (dest[k] & 0xffffff) | (sValues[k] << 24);

                  }

               }

               break;

            case PIPE_FORMAT_S8_USCALED_Z24_UNORM:

               if (format == GL_DEPTH_STENCIL) {

                  uint *dest = (uint *) (stmap + spanY * pt->stride + spanX*4);

                  GLint k;

                  assert(usage == PIPE_TRANSFER_WRITE);

                  for (k = 0; k < spanWidth; k++) {

                     dest[k] = (zValues[k] << 8) | (sValues[k] & 0xff);

                  }

               }

               else {

                  uint *dest = (uint *) (stmap + spanY * pt->stride + spanX*4);

                  GLint k;

                  assert(usage == PIPE_TRANSFER_READ_WRITE);

                  for (k = 0; k < spanWidth; k++) {

                     dest[k] = (dest[k] & 0xffffff00) | (sValues[k] & 0xff);

                  }

               }

               break;

            default:

               assert(0);

            }

         }

      }

      skipPixels += spanWidth;

   }

   _mesa_unmap_pbo_source(ctx, &clippedUnpack);

   /* unmap the stencil buffer */

   pipe_transfer_unmap(pipe, pt);

   pipe->transfer_destroy(pipe, pt);

}

/**

 * Called via ctx->Driver.DrawPixels()

 */

static void

st_DrawPixels(struct gl_context *ctx, GLint x, GLint y,

              GLsizei width, GLsizei height,

              GLenum format, GLenum type,

              const struct gl_pixelstore_attrib *unpack, const GLvoid *pixels)

{

   void *driver_vp, *driver_fp;

   struct st_context *st = st_context(ctx);

   const GLfloat *color;

   struct pipe_context *pipe = st->pipe;

   GLboolean write_stencil = GL_FALSE, write_depth = GL_FALSE;

   struct pipe_sampler_view *sv[2];

   int num_sampler_view = 1;

   enum pipe_format stencil_format = PIPE_FORMAT_NONE;

   if (format == GL_DEPTH_STENCIL)

      write_stencil = write_depth = GL_TRUE;

   else if (format == GL_STENCIL_INDEX)

      write_stencil = GL_TRUE;

   else if (format == GL_DEPTH_COMPONENT)

      write_depth = GL_TRUE;

   if (write_stencil) {

      enum pipe_format tex_format;

      /* can we write to stencil if not fallback */

      if (!pipe->screen->get_param(pipe->screen, PIPE_CAP_SHADER_STENCIL_EXPORT))

	 goto stencil_fallback;

      tex_format = st_choose_format(st->pipe->screen, base_format(format),

                                    PIPE_TEXTURE_2D,

				    0, PIPE_BIND_SAMPLER_VIEW);

      if (tex_format == PIPE_FORMAT_Z24_UNORM_S8_USCALED)

	 stencil_format = PIPE_FORMAT_X24S8_USCALED;

      else if (tex_format == PIPE_FORMAT_S8_USCALED_Z24_UNORM)

	 stencil_format = PIPE_FORMAT_S8X24_USCALED;

      else

	 stencil_format = PIPE_FORMAT_S8_USCALED;

      if (stencil_format == PIPE_FORMAT_NONE)

	 goto stencil_fallback;

   }

   /* Mesa state should be up to date by now */

   assert(ctx->NewState == 0x0);

   st_validate_state(st);

   if (write_depth || write_stencil) {

      driver_fp = make_fragment_shader_z_stencil(st, write_depth, write_stencil);

      driver_vp = make_passthrough_vertex_shader(st, GL_TRUE);

      color = ctx->Current.RasterColor;

   }

   else {

      driver_fp = combined_drawpix_fragment_program(ctx);

      driver_vp = make_passthrough_vertex_shader(st, GL_FALSE);

      color = NULL;

      if (st->pixel_xfer.pixelmap_enabled) {

	  sv[1] = st->pixel_xfer.pixelmap_sampler_view;

	  num_sampler_view++;

      }

   }

   /* draw with textured quad */

   {

      struct pipe_resource *pt

         = make_texture(st, width, height, format, type, unpack, pixels);

      if (pt) {

         sv[0] = st_create_texture_sampler_view(st->pipe, pt);

         if (sv[0]) {

	    if (write_stencil) {

	       sv[1] = st_create_texture_sampler_view_format(st->pipe, pt,

                                                             stencil_format);

	       num_sampler_view++;

	    }

            draw_textured_quad(ctx, x, y, ctx->Current.RasterPos[2],

                               width, height,

                               ctx->Pixel.ZoomX, ctx->Pixel.ZoomY,

                               sv,

                               num_sampler_view,

                               driver_vp,

                               driver_fp,

                               color, GL_FALSE, write_depth, write_stencil);

            pipe_sampler_view_reference(&sv[0], NULL);

            if (num_sampler_view > 1)

               pipe_sampler_view_reference(&sv[1], NULL);

         }

         pipe_resource_reference(&pt, NULL);

      }

   }

   return;

stencil_fallback:

   draw_stencil_pixels(ctx, x, y, width, height, format, type,

		       unpack, pixels);

}

/**

 * Software fallback for glCopyPixels(GL_STENCIL).

 */

static void

copy_stencil_pixels(struct gl_context *ctx, GLint srcx, GLint srcy,

                    GLsizei width, GLsizei height,

                    GLint dstx, GLint dsty)

{

   struct st_renderbuffer *rbDraw;

   struct pipe_context *pipe = st_context(ctx)->pipe;

   enum pipe_transfer_usage usage;

   struct pipe_transfer *ptDraw;

   ubyte *drawMap;

   ubyte *buffer;

   int i;

   buffer = malloc(width * height * sizeof(ubyte));

   if (!buffer) {

      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels(stencil)");

      return;

   }

   /* Get the dest renderbuffer.  If there's a wrapper, use the

    * underlying renderbuffer.

    */

   rbDraw = st_renderbuffer(ctx->DrawBuffer->_StencilBuffer);

   if (rbDraw->Base.Wrapped)

      rbDraw = st_renderbuffer(rbDraw->Base.Wrapped);

   /* this will do stencil pixel transfer ops */

   st_read_stencil_pixels(ctx, srcx, srcy, width, height,

                          GL_STENCIL_INDEX, GL_UNSIGNED_BYTE,

                          &ctx->DefaultPacking, buffer);

   if (0) {

      /* debug code: dump stencil values */

      GLint row, col;

      for (row = 0; row < height; row++) {

         printf("%3d: ", row);

         for (col = 0; col < width; col++) {

            printf("%02x ", buffer[col + row * width]);

         }

         printf("\n");

      }

   }

   if (util_format_get_component_bits(rbDraw->format,

                                     UTIL_FORMAT_COLORSPACE_ZS, 0) != 0)

      usage = PIPE_TRANSFER_READ_WRITE;

   else

      usage = PIPE_TRANSFER_WRITE;

   if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {

      dsty = rbDraw->Base.Height - dsty - height;

   }

   ptDraw = pipe_get_transfer(st_context(ctx)->pipe,

                              rbDraw->texture, 0, 0,

                              usage, dstx, dsty,

                              width, height);

   assert(util_format_get_blockwidth(ptDraw->resource->format) == 1);

   assert(util_format_get_blockheight(ptDraw->resource->format) == 1);

   /* map the stencil buffer */

   drawMap = pipe_transfer_map(pipe, ptDraw);

   /* draw */

   /* XXX PixelZoom not handled yet */

   for (i = 0; i < height; i++) {

      ubyte *dst;

      const ubyte *src;

      int y;

      y = i;

      if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {

         y = height - y - 1;

      }

      dst = drawMap + y * ptDraw->stride;

      src = buffer + i * width;

      switch (ptDraw->resource->format) {

      case PIPE_FORMAT_Z24_UNORM_S8_USCALED:

         {

            uint *dst4 = (uint *) dst;

            int j;

            assert(usage == PIPE_TRANSFER_READ_WRITE);

            for (j = 0; j < width; j++) {

               *dst4 = (*dst4 & 0xffffff) | (src[j] << 24);

               dst4++;

            }

         }

         break;

      case PIPE_FORMAT_S8_USCALED_Z24_UNORM:

         {

            uint *dst4 = (uint *) dst;

            int j;

            assert(usage == PIPE_TRANSFER_READ_WRITE);

            for (j = 0; j < width; j++) {

               *dst4 = (*dst4 & 0xffffff00) | (src[j] & 0xff);

               dst4++;

            }

         }

         break;

      case PIPE_FORMAT_S8_USCALED:

         assert(usage == PIPE_TRANSFER_WRITE);

         memcpy(dst, src, width);

         break;

      default:

         assert(0);

      }

   }

   free(buffer);

   /* unmap the stencil buffer */

   pipe_transfer_unmap(pipe, ptDraw);

   pipe->transfer_destroy(pipe, ptDraw);

}

static void

st_CopyPixels(struct gl_context *ctx, GLint srcx, GLint srcy,

              GLsizei width, GLsizei height,

              GLint dstx, GLint dsty, GLenum type)

{

   struct st_context *st = st_context(ctx);

   struct pipe_context *pipe = st->pipe;

   struct pipe_screen *screen = pipe->screen;

   struct st_renderbuffer *rbRead;

   void *driver_vp, *driver_fp;

   struct pipe_resource *pt;

   struct pipe_sampler_view *sv[2];

   int num_sampler_view = 1;

   GLfloat *color;

   enum pipe_format srcFormat, texFormat;

   GLboolean invertTex = GL_FALSE;

   GLint readX, readY, readW, readH;

   GLuint sample_count;

   struct gl_pixelstore_attrib pack = ctx->DefaultPacking;

   st_validate_state(st);

   if (type == GL_STENCIL) {

      /* can't use texturing to do stencil */

      copy_stencil_pixels(ctx, srcx, srcy, width, height, dstx, dsty);

      return;

   }

   if (type == GL_COLOR) {

      rbRead = st_get_color_read_renderbuffer(ctx);