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

 *

 * Copyright 2007 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.

 *

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

 /*

  * Authors:

  *   Brian Paul

  */

#include "main/imports.h"

#include "main/image.h"

#include "main/bufferobj.h"

#include "main/macros.h"

#include "main/pbo.h"

#include "program/program.h"

#include "program/prog_print.h"

#include "st_context.h"

#include "st_atom.h"

#include "st_atom_constbuf.h"

#include "st_program.h"

#include "st_cb_bitmap.h"

#include "st_texture.h"

#include "pipe/p_context.h"

#include "pipe/p_defines.h"

#include "pipe/p_shader_tokens.h"

#include "util/u_inlines.h"

#include "util/u_draw_quad.h"

#include "util/u_simple_shaders.h"

#include "util/u_upload_mgr.h"

#include "program/prog_instruction.h"

#include "cso_cache/cso_context.h"

/**

 * glBitmaps are drawn as textured quads.  The user's bitmap pattern

 * is stored in a texture image.  An alpha8 texture format is used.

 * The fragment shader samples a bit (texel) from the texture, then

 * discards the fragment if the bit is off.

 *

 * Note that we actually store the inverse image of the bitmap to

 * simplify the fragment program.  An "on" bit gets stored as texel=0x0

 * and an "off" bit is stored as texel=0xff.  Then we kill the

 * fragment if the negated texel value is less than zero.

 */

/**

 * The bitmap cache attempts to accumulate multiple glBitmap calls in a

 * buffer which is then rendered en mass upon a flush, state change, etc.

 * A wide, short buffer is used to target the common case of a series

 * of glBitmap calls being used to draw text.

 */

static GLboolean UseBitmapCache = GL_TRUE;

#define BITMAP_CACHE_WIDTH  512

#define BITMAP_CACHE_HEIGHT 32

struct bitmap_cache

{

   /** Window pos to render the cached image */

   GLint xpos, ypos;

   /** Bounds of region used in window coords */

   GLint xmin, ymin, xmax, ymax;

   GLfloat color[4];

   /** Bitmap's Z position */

   GLfloat zpos;

   struct pipe_resource *texture;

   struct pipe_transfer *trans;

   GLboolean empty;

   /** An I8 texture image: */

   ubyte *buffer;

};

/** Epsilon for Z comparisons */

#define Z_EPSILON 1e-06

/**

 * Make fragment program for glBitmap:

 *   Sample the texture and kill the fragment if the bit is 0.

 * This program will be combined with the user's fragment program.

 */

static struct st_fragment_program *

make_bitmap_fragment_program(struct gl_context *ctx, GLuint samplerIndex)

{

   struct st_context *st = st_context(ctx);

   struct st_fragment_program *stfp;

   struct gl_program *p;

   GLuint ic = 0;

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

   if (!p)

      return NULL;

   p->NumInstructions = 3;

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

   if (!p->Instructions) {

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

      return NULL;

   }

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

   /* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */

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

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

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

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

   p->Instructions[ic].SrcReg[0].Index = VARYING_SLOT_TEX0;

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

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

   ic++;

   /* KIL if -tmp0 < 0 # texel=0 -> keep / texel=0 -> discard */

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

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

   if (st->bitmap.tex_format == PIPE_FORMAT_L8_UNORM)

      p->Instructions[ic].SrcReg[0].Swizzle = SWIZZLE_XXXX;

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

   p->Instructions[ic].SrcReg[0].Negate = NEGATE_XYZW;

   ic++;

   /* END; */

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

   assert(ic == p->NumInstructions);

   p->InputsRead = VARYING_BIT_TEX0;

   p->OutputsWritten = 0x0;

   p->SamplersUsed = (1 << samplerIndex);

   stfp = (struct st_fragment_program *) p;

   stfp->Base.UsesKill = GL_TRUE;

   return stfp;

}

static struct gl_program *

make_bitmap_fragment_program_glsl(struct st_context *st,

                                  struct st_fragment_program *orig,

                                  GLuint samplerIndex)

{

   struct gl_context *ctx = st->ctx;

   struct st_fragment_program *fp = (struct st_fragment_program *)

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

   if (!fp)

      return NULL;

   get_bitmap_visitor(fp, orig->glsl_to_tgsi, samplerIndex);

   return &fp->Base.Base;

}

static int

find_free_bit(uint bitfield)

{

   int i;

   for (i = 0; i < 32; i++) {

      if ((bitfield & (1 << i)) == 0) {

         return i;

      }

   }

   return -1;

}

/**

 * Combine basic bitmap fragment program with the user-defined program.

 * \param st  current context

 * \param fpIn  the incoming fragment program

 * \param fpOut  the new fragment program which does fragment culling

 * \param bitmap_sampler  sampler number for the bitmap texture

 */

void

st_make_bitmap_fragment_program(struct st_context *st,

                                struct gl_fragment_program *fpIn,

                                struct gl_fragment_program **fpOut,

                                GLuint *bitmap_sampler)

{

   struct st_fragment_program *bitmap_prog;

   struct st_fragment_program *stfpIn = (struct st_fragment_program *) fpIn;

   struct gl_program *newProg;

   uint sampler;

   /*

    * Generate new program which is the user-defined program prefixed

    * with the bitmap sampler/kill instructions.

    */

   sampler = find_free_bit(fpIn->Base.SamplersUsed);

   if (stfpIn->glsl_to_tgsi)

      newProg = make_bitmap_fragment_program_glsl(st, stfpIn, sampler);

   else {

      bitmap_prog = make_bitmap_fragment_program(st->ctx, sampler);

      newProg = _mesa_combine_programs(st->ctx,

                                       &bitmap_prog->Base.Base,

                                       &fpIn->Base);

      /* done with this after combining */

      st_reference_fragprog(st, &bitmap_prog, NULL);

   }

#if 0

   {

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

      _mesa_print_program(newProg);

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

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

      _mesa_print_parameter_list(newProg->Parameters);

   }

#endif

   /* return results */

   *fpOut = (struct gl_fragment_program *) newProg;

   *bitmap_sampler = sampler;

}

/**

 * Copy user-provide bitmap bits into texture buffer, expanding

 * bits into texels.

 * "On" bits will set texels to 0x0.

 * "Off" bits will not modify texels.

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

 * the texture.  We deal with that with texcoords.

 */

static void

unpack_bitmap(struct st_context *st,

              GLint px, GLint py, GLsizei width, GLsizei height,

              const struct gl_pixelstore_attrib *unpack,

              const GLubyte *bitmap,

              ubyte *destBuffer, uint destStride)

{

   destBuffer += py * destStride + px;

   _mesa_expand_bitmap(width, height, unpack, bitmap,

                       destBuffer, destStride, 0x0);

}

/**

 * Create a texture which represents a bitmap image.

 */

static struct pipe_resource *

make_bitmap_texture(struct gl_context *ctx, GLsizei width, GLsizei height,

                    const struct gl_pixelstore_attrib *unpack,

                    const GLubyte *bitmap)

{

   struct st_context *st = st_context(ctx);

   struct pipe_context *pipe = st->pipe;

   struct pipe_transfer *transfer;

   ubyte *dest;

   struct pipe_resource *pt;

   /* PBO source... */

   bitmap = _mesa_map_pbo_source(ctx, unpack, bitmap);

   if (!bitmap) {

      return NULL;

   }

   /**

    * Create texture to hold bitmap pattern.

    */

   pt = st_texture_create(st, st->internal_target, st->bitmap.tex_format,

                          0, width, height, 1, 1, 0,

                          PIPE_BIND_SAMPLER_VIEW);

   if (!pt) {

      _mesa_unmap_pbo_source(ctx, unpack);

      return NULL;

   }

   dest = pipe_transfer_map(st->pipe, pt, 0, 0,

                            PIPE_TRANSFER_WRITE,

                            0, 0, width, height, &transfer);

   /* Put image into texture transfer */

   memset(dest, 0xff, height * transfer->stride);

   unpack_bitmap(st, 0, 0, width, height, unpack, bitmap,

                 dest, transfer->stride);

   _mesa_unmap_pbo_source(ctx, unpack);

   /* Release transfer */

   pipe_transfer_unmap(pipe, transfer);

   return pt;

}

static void

setup_bitmap_vertex_data(struct st_context *st, bool normalized,

                         int x, int y, int width, int height,

                         float z, const float color[4],

			 struct pipe_resource **vbuf,

			 unsigned *vbuf_offset)

{

   const GLfloat fb_width = (GLfloat)st->state.framebuffer.width;

   const GLfloat fb_height = (GLfloat)st->state.framebuffer.height;

   const GLfloat x0 = (GLfloat)x;

   const GLfloat x1 = (GLfloat)(x + width);

   const GLfloat y0 = (GLfloat)y;

   const GLfloat y1 = (GLfloat)(y + height);

   GLfloat sLeft = (GLfloat)0.0, sRight = (GLfloat)1.0;

   GLfloat tTop = (GLfloat)0.0, tBot = (GLfloat)1.0 - tTop;

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

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

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

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

   GLuint i;

   float (*vertices)[3][4];  /**< vertex pos + color + texcoord */

   if(!normalized)

   {

      sRight = (GLfloat) width;

      tBot = (GLfloat) height;

   }

   if (u_upload_alloc(st->uploader, 0, 4 * sizeof(vertices[0]),

                      vbuf_offset, vbuf, (void **) &vertices) != PIPE_OK) {

      return;

   }

   /* Positions are in clip coords since we need to do clipping in case

    * the bitmap quad goes beyond the window bounds.

    */

   vertices[0][0][0] = clip_x0;

   vertices[0][0][1] = clip_y0;

   vertices[0][2][0] = sLeft;

   vertices[0][2][1] = tTop;

   vertices[1][0][0] = clip_x1;

   vertices[1][0][1] = clip_y0;

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

   vertices[1][2][1] = tTop;

   vertices[2][0][0] = clip_x1;

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

   vertices[2][2][0] = sRight;

   vertices[2][2][1] = tBot;

   vertices[3][0][0] = clip_x0;

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

   vertices[3][2][0] = sLeft;

   vertices[3][2][1] = tBot;

   /* same for all verts: */

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

      vertices[i][0][2] = z;

      vertices[i][0][3] = 1.0f;

      vertices[i][1][0] = color[0];

      vertices[i][1][1] = color[1];

      vertices[i][1][2] = color[2];

      vertices[i][1][3] = color[3];

      vertices[i][2][2] = 0.0; /*R*/

      vertices[i][2][3] = 1.0; /*Q*/

   }

   u_upload_unmap(st->uploader);

}

/**

 * Render a glBitmap by drawing a textured quad

 */

static void

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

                 GLsizei width, GLsizei height,

                 struct pipe_sampler_view *sv,

                 const GLfloat *color)

{

   struct st_context *st = st_context(ctx);

   struct pipe_context *pipe = st->pipe;

   struct cso_context *cso = st->cso_context;

   struct st_fp_variant *fpv;

   struct st_fp_variant_key key;

   GLuint maxSize;

   GLuint offset;

   struct pipe_resource *vbuf = NULL;

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

   key.st = st;

   key.bitmap = GL_TRUE;

   key.clamp_color = st->clamp_frag_color_in_shader &&

                     st->ctx->Color._ClampFragmentColor;

   fpv = st_get_fp_variant(st, st->fp, &key);

   /* As an optimization, Mesa's fragment programs will sometimes get the

    * primary color from a statevar/constant rather than a varying variable.

    * when that's the case, we need to ensure that we use the 'color'

    * parameter and not the current attribute color (which may have changed

    * through glRasterPos and state validation.

    * So, we force the proper color here.  Not elegant, but it works.

    */

   {

      GLfloat colorSave[4];

      COPY_4V(colorSave, ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);

      COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color);

      st_upload_constants(st, fpv->parameters, PIPE_SHADER_FRAGMENT);

      COPY_4V(ctx->Current.Attrib[VERT_ATTRIB_COLOR0], colorSave);

   }

   /* limit checks */

   /* XXX if the bitmap is larger than the 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 <= (GLsizei)maxSize);

   assert(height <= (GLsizei)maxSize);

   cso_save_rasterizer(cso);

   cso_save_samplers(cso, PIPE_SHADER_FRAGMENT);

   cso_save_sampler_views(cso, PIPE_SHADER_FRAGMENT);

   cso_save_viewport(cso);

   cso_save_fragment_shader(cso);

   cso_save_stream_outputs(cso);

   cso_save_vertex_shader(cso);

   cso_save_tessctrl_shader(cso);

   cso_save_tesseval_shader(cso);

   cso_save_geometry_shader(cso);

   cso_save_vertex_elements(cso);

   cso_save_aux_vertex_buffer_slot(cso);

   /* rasterizer state: just scissor */

   st->bitmap.rasterizer.scissor = ctx->Scissor.EnableFlags & 1;

   cso_set_rasterizer(cso, &st->bitmap.rasterizer);

   /* fragment shader state: TEX lookup program */

   cso_set_fragment_shader_handle(cso, fpv->driver_shader);

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

   cso_set_vertex_shader_handle(cso, st->bitmap.vs);

   /* disable other shaders */

   cso_set_tessctrl_shader_handle(cso, NULL);

   cso_set_tesseval_shader_handle(cso, NULL);

   cso_set_geometry_shader_handle(cso, NULL);

   /* user samplers, plus our bitmap sampler */

   {

      struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];

      uint num = MAX2(fpv->bitmap_sampler + 1,

                      st->state.num_samplers[PIPE_SHADER_FRAGMENT]);

      uint i;

      for (i = 0; i < st->state.num_samplers[PIPE_SHADER_FRAGMENT]; i++) {

         samplers[i] = &st->state.samplers[PIPE_SHADER_FRAGMENT][i];

      }

      samplers[fpv->bitmap_sampler] =

         &st->bitmap.samplers[sv->texture->target != PIPE_TEXTURE_RECT];

      cso_set_samplers(cso, PIPE_SHADER_FRAGMENT, num,

                       (const struct pipe_sampler_state **) samplers);

   }

   /* user textures, plus the bitmap texture */

   {

      struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];

      uint num = MAX2(fpv->bitmap_sampler + 1,

                      st->state.num_sampler_views[PIPE_SHADER_FRAGMENT]);

      memcpy(sampler_views, st->state.sampler_views[PIPE_SHADER_FRAGMENT],

             sizeof(sampler_views));

      sampler_views[fpv->bitmap_sampler] = sv;

      cso_set_sampler_views(cso, PIPE_SHADER_FRAGMENT, num, sampler_views);

   }

   /* viewport state: viewport matching window dims */

   {

      const GLboolean invert = st->state.fb_orientation == Y_0_TOP;

      const GLfloat width = (GLfloat)st->state.framebuffer.width;

      const GLfloat height = (GLfloat)st->state.framebuffer.height;

      struct pipe_viewport_state vp;

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

      vp.scale[1] = height * (invert ? -0.5f : 0.5f);

      vp.scale[2] = 0.5f;

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

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

      vp.translate[2] = 0.5f;

      cso_set_viewport(cso, &vp);

   }

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

   cso_set_stream_outputs(st->cso_context, 0, NULL, NULL);

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

   z = z * 2.0f - 1.0f;

   /* draw textured quad */

   setup_bitmap_vertex_data(st, sv->texture->target != PIPE_TEXTURE_RECT,

			    x, y, width, height, z, color, &vbuf, &offset);

   if (vbuf) {

      util_draw_vertex_buffer(pipe, st->cso_context, vbuf,

                              cso_get_aux_vertex_buffer_slot(st->cso_context),

                              offset,

                              PIPE_PRIM_TRIANGLE_FAN,

                              4,  /* verts */

                              3); /* attribs/vert */

   }

   /* restore state */

   cso_restore_rasterizer(cso);

   cso_restore_samplers(cso, PIPE_SHADER_FRAGMENT);

   cso_restore_sampler_views(cso, PIPE_SHADER_FRAGMENT);

   cso_restore_viewport(cso);

   cso_restore_fragment_shader(cso);

   cso_restore_vertex_shader(cso);

   cso_restore_tessctrl_shader(cso);

   cso_restore_tesseval_shader(cso);

   cso_restore_geometry_shader(cso);

   cso_restore_vertex_elements(cso);

   cso_restore_aux_vertex_buffer_slot(cso);

   cso_restore_stream_outputs(cso);

   pipe_resource_reference(&vbuf, NULL);

}

static void

reset_cache(struct st_context *st)

{

   struct bitmap_cache *cache = st->bitmap.cache;

   /*memset(cache->buffer, 0xff, sizeof(cache->buffer));*/

   cache->empty = GL_TRUE;

   cache->xmin = 1000000;

   cache->xmax = -1000000;

   cache->ymin = 1000000;

   cache->ymax = -1000000;

   assert(!cache->texture);

   /* allocate a new texture */

   cache->texture = st_texture_create(st, PIPE_TEXTURE_2D,

                                      st->bitmap.tex_format, 0,

                                      BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,

                                      1, 1, 0,

				      PIPE_BIND_SAMPLER_VIEW);

}

/** Print bitmap image to stdout (debug) */

static void

print_cache(const struct bitmap_cache *cache)

{

   int i, j, k;

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

      k = BITMAP_CACHE_WIDTH * (BITMAP_CACHE_HEIGHT - i - 1);

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

         if (cache->buffer[k])

            printf("X");

         else

            printf(" ");

         k++;

      }

      printf("\n");

   }

}

/**

 * Create gallium pipe_transfer object for the bitmap cache.

 */

static void

create_cache_trans(struct st_context *st)

{

   struct pipe_context *pipe = st->pipe;

   struct bitmap_cache *cache = st->bitmap.cache;

   if (cache->trans)

      return;

   /* Map the texture transfer.

    * Subsequent glBitmap calls will write into the texture image.

    */

   cache->buffer = pipe_transfer_map(pipe, cache->texture, 0, 0,

                                     PIPE_TRANSFER_WRITE, 0, 0,

                                     BITMAP_CACHE_WIDTH,

                                     BITMAP_CACHE_HEIGHT, &cache->trans);

   /* init image to all 0xff */

   memset(cache->buffer, 0xff, cache->trans->stride * BITMAP_CACHE_HEIGHT);

}

/**

 * If there's anything in the bitmap cache, draw/flush it now.

 */

void

st_flush_bitmap_cache(struct st_context *st)

{

   if (!st->bitmap.cache->empty) {

      struct bitmap_cache *cache = st->bitmap.cache;

      struct pipe_context *pipe = st->pipe;

      struct pipe_sampler_view *sv;

      assert(cache->xmin <= cache->xmax);

/*    printf("flush size %d x %d  at %d, %d\n",

             cache->xmax - cache->xmin,

             cache->ymax - cache->ymin,

             cache->xpos, cache->ypos);

*/

      /* The texture transfer has been mapped until now.

          * So unmap and release the texture transfer before drawing.

          */

      if (cache->trans && cache->buffer) {

         if (0)

            print_cache(cache);

         pipe_transfer_unmap(pipe, cache->trans);

         cache->buffer = NULL;

         cache->trans = NULL;

      }

      sv = st_create_texture_sampler_view(st->pipe, cache->texture);

      if (sv) {

         draw_bitmap_quad(st->ctx,

                          cache->xpos,

                          cache->ypos,

                          cache->zpos,

                          BITMAP_CACHE_WIDTH, BITMAP_CACHE_HEIGHT,

                          sv,

                          cache->color);

         pipe_sampler_view_reference(&sv, NULL);

      }

      /* release/free the texture */

      pipe_resource_reference(&cache->texture, NULL);

      reset_cache(st);

   }

}

/**

 * Try to accumulate this glBitmap call in the bitmap cache.

 * \return  GL_TRUE for success, GL_FALSE if bitmap is too large, etc.

 */

static GLboolean

accum_bitmap(struct gl_context *ctx,

             GLint x, GLint y, GLsizei width, GLsizei height,

             const struct gl_pixelstore_attrib *unpack,

             const GLubyte *bitmap )

{

   struct st_context *st = ctx->st;

   struct bitmap_cache *cache = st->bitmap.cache;

   int px = -999, py = -999;

   const GLfloat z = st->ctx->Current.RasterPos[2];

   if (width > BITMAP_CACHE_WIDTH ||

       height > BITMAP_CACHE_HEIGHT)

      return GL_FALSE; /* too big to cache */

   if (!cache->empty) {

      px = x - cache->xpos;  /* pos in buffer */

      py = y - cache->ypos;

      if (px < 0 || px + width > BITMAP_CACHE_WIDTH ||

          py < 0 || py + height > BITMAP_CACHE_HEIGHT ||

          !TEST_EQ_4V(st->ctx->Current.RasterColor, cache->color) ||

          ((fabs(z - cache->zpos) > Z_EPSILON))) {

         /* This bitmap would extend beyond cache bounds, or the bitmap

          * color is changing

          * so flush and continue.

          */

         st_flush_bitmap_cache(st);

      }

   }

   if (cache->empty) {

      /* Initialize.  Center bitmap vertically in the buffer. */

      px = 0;

      py = (BITMAP_CACHE_HEIGHT - height) / 2;

      cache->xpos = x;

      cache->ypos = y - py;

      cache->zpos = z;

      cache->empty = GL_FALSE;

      COPY_4FV(cache->color, st->ctx->Current.RasterColor);

   }

   assert(px != -999);

   assert(py != -999);

   if (x < cache->xmin)

      cache->xmin = x;

   if (y < cache->ymin)

      cache->ymin = y;

   if (x + width > cache->xmax)

      cache->xmax = x + width;

   if (y + height > cache->ymax)

      cache->ymax = y + height;

   /* create the transfer if needed */

   create_cache_trans(st);

   /* PBO source... */

   bitmap = _mesa_map_pbo_source(ctx, unpack, bitmap);

   if (!bitmap) {

      return FALSE;

   }

   unpack_bitmap(st, px, py, width, height, unpack, bitmap,

                 cache->buffer, BITMAP_CACHE_WIDTH);

   _mesa_unmap_pbo_source(ctx, unpack);

   return GL_TRUE; /* accumulated */

}

/**

 * Called via ctx->Driver.Bitmap()

 */

static void

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

          GLsizei width, GLsizei height,

          const struct gl_pixelstore_attrib *unpack, const GLubyte *bitmap )

{

   struct st_context *st = st_context(ctx);

   struct pipe_resource *pt;

   if (width == 0 || height == 0)

      return;

   st_validate_state(st);

   if (!st->bitmap.vs) {

      /* create pass-through vertex shader now */

      const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,

                                      TGSI_SEMANTIC_COLOR,

        st->needs_texcoord_semantic ? TGSI_SEMANTIC_TEXCOORD :

                                      TGSI_SEMANTIC_GENERIC };

      const uint semantic_indexes[] = { 0, 0, 0 };

      st->bitmap.vs = util_make_vertex_passthrough_shader(st->pipe, 3,

                                                          semantic_names,

                                                          semantic_indexes,

                                                          FALSE);

   }

   if (UseBitmapCache && accum_bitmap(ctx, x, y, width, height, unpack, bitmap))

      return;

   pt = make_bitmap_texture(ctx, width, height, unpack, bitmap);

   if (pt) {

      struct pipe_sampler_view *sv =

         st_create_texture_sampler_view(st->pipe, pt);

      assert(pt->target == PIPE_TEXTURE_2D || pt->target == PIPE_TEXTURE_RECT);

      if (sv) {

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

                          width, height, sv,

                          st->ctx->Current.RasterColor);

         pipe_sampler_view_reference(&sv, NULL);

      }

      /* release/free the texture */

      pipe_resource_reference(&pt, NULL);

   }

}

/** Per-context init */

void

st_init_bitmap_functions(struct dd_function_table *functions)

{

   functions->Bitmap = st_Bitmap;

}

/** Per-context init */

void

st_init_bitmap(struct st_context *st)

{

   struct pipe_sampler_state *sampler = &st->bitmap.samplers[0];

   struct pipe_context *pipe = st->pipe;

   struct pipe_screen *screen = pipe->screen;

   /* init sampler state once */

   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;

   st->bitmap.samplers[1] = *sampler;

   st->bitmap.samplers[1].normalized_coords = 1;

   /* init baseline rasterizer state once */

   memset(&st->bitmap.rasterizer, 0, sizeof(st->bitmap.rasterizer));

   st->bitmap.rasterizer.half_pixel_center = 1;

   st->bitmap.rasterizer.bottom_edge_rule = 1;

   st->bitmap.rasterizer.depth_clip = 1;

   /* find a usable texture format */

   if (screen->is_format_supported(screen, PIPE_FORMAT_I8_UNORM,

                                   PIPE_TEXTURE_2D, 0,

                                   PIPE_BIND_SAMPLER_VIEW)) {

      st->bitmap.tex_format = PIPE_FORMAT_I8_UNORM;

   }

   else if (screen->is_format_supported(screen, PIPE_FORMAT_A8_UNORM,

                                        PIPE_TEXTURE_2D, 0,

                                        PIPE_BIND_SAMPLER_VIEW)) {

      st->bitmap.tex_format = PIPE_FORMAT_A8_UNORM;

   }

   else if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM,

                                        PIPE_TEXTURE_2D, 0,

                                        PIPE_BIND_SAMPLER_VIEW)) {

      st->bitmap.tex_format = PIPE_FORMAT_L8_UNORM;

   }

   else {

      /* XXX support more formats */

      assert(0);

   }

   /* alloc bitmap cache object */

   st->bitmap.cache = ST_CALLOC_STRUCT(bitmap_cache);

   reset_cache(st);

}

/** Per-context tear-down */

void

st_destroy_bitmap(struct st_context *st)

{

   struct pipe_context *pipe = st->pipe;

   struct bitmap_cache *cache = st->bitmap.cache;

   if (st->bitmap.vs) {

      cso_delete_vertex_shader(st->cso_context, st->bitmap.vs);

      st->bitmap.vs = NULL;

   }

   if (cache) {

      if (cache->trans && cache->buffer) {

         pipe_transfer_unmap(pipe, cache->trans);

      }

      pipe_resource_reference(&st->bitmap.cache->texture, NULL);

      free(st->bitmap.cache);

      st->bitmap.cache = NULL;

   }

}