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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.

 *

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

/*

 * This file implements the st_draw_vbo() function which is called from

 * Mesa's VBO module.  All point/line/triangle rendering is done through

 * this function whether the user called glBegin/End, glDrawArrays,

 * glDrawElements, glEvalMesh, or glCalList, etc.

 *

 * Authors:

 *   Keith Whitwell 

 */

#include "main/imports.h"

#include "main/image.h"

#include "main/bufferobj.h"

#include "main/macros.h"

#include "vbo/vbo.h"

#include "st_context.h"

#include "st_atom.h"

#include "st_cb_bufferobjects.h"

#include "st_cb_xformfb.h"

#include "st_debug.h"

#include "st_draw.h"

#include "st_program.h"

#include "pipe/p_context.h"

#include "pipe/p_defines.h"

#include "util/u_inlines.h"

#include "util/u_format.h"

#include "util/u_prim.h"

#include "util/u_draw_quad.h"

#include "util/u_upload_mgr.h"

#include "draw/draw_context.h"

#include "cso_cache/cso_context.h"

#include "../glsl/ir_uniform.h"

/**

 * This is very similar to vbo_all_varyings_in_vbos() but we are

 * only interested in per-vertex data.  See bug 38626.

 */

static GLboolean

all_varyings_in_vbos(const struct gl_client_array *arrays[])

{

   GLuint i;

   for (i = 0; i < VERT_ATTRIB_MAX; i++)

      if (arrays[i]->StrideB &&

          !arrays[i]->InstanceDivisor &&

          !_mesa_is_bufferobj(arrays[i]->BufferObj))

	 return GL_FALSE;

   return GL_TRUE;

}

/**

 * Basically, translate Mesa's index buffer information into

 * a pipe_index_buffer object.

 * \return TRUE or FALSE for success/failure

 */

static boolean

setup_index_buffer(struct st_context *st,

                   const struct _mesa_index_buffer *ib,

                   struct pipe_index_buffer *ibuffer)

{

   struct gl_buffer_object *bufobj = ib->obj;

   ibuffer->index_size = vbo_sizeof_ib_type(ib->type);

   /* get/create the index buffer object */

   if (_mesa_is_bufferobj(bufobj)) {

      /* indices are in a real VBO */

      ibuffer->buffer = st_buffer_object(bufobj)->buffer;

      ibuffer->offset = pointer_to_offset(ib->ptr);

   }

   else if (st->indexbuf_uploader) {

      if (u_upload_data(st->indexbuf_uploader, 0,

                        ib->count * ibuffer->index_size, ib->ptr,

                        &ibuffer->offset, &ibuffer->buffer) != PIPE_OK) {

         /* out of memory */

         return FALSE;

      }

      u_upload_unmap(st->indexbuf_uploader);

   }

   else {

      /* indices are in user space memory */

      ibuffer->user_buffer = ib->ptr;

   }

   cso_set_index_buffer(st->cso_context, ibuffer);

   return TRUE;

}

/**

 * Prior to drawing, check that any uniforms referenced by the

 * current shader have been set.  If a uniform has not been set,

 * issue a warning.

 */

static void

check_uniforms(struct gl_context *ctx)

{

   struct gl_shader_program *shProg[3] = {

      ctx->Shader.CurrentVertexProgram,

      ctx->Shader.CurrentGeometryProgram,

      ctx->Shader.CurrentFragmentProgram,

   };

   unsigned j;

   for (j = 0; j < 3; j++) {

      unsigned i;

      if (shProg[j] == NULL || !shProg[j]->LinkStatus)

	 continue;

      for (i = 0; i < shProg[j]->NumUserUniformStorage; i++) {

         const struct gl_uniform_storage *u = &shProg[j]->UniformStorage[i];

         if (!u->initialized) {

            _mesa_warning(ctx,

                          "Using shader with uninitialized uniform: %s",

                          u->name);

         }

      }

   }

}

/**

 * Translate OpenGL primtive type (GL_POINTS, GL_TRIANGLE_STRIP, etc) to

 * the corresponding Gallium type.

 */

static unsigned

translate_prim(const struct gl_context *ctx, unsigned prim)

{

   /* GL prims should match Gallium prims, spot-check a few */

   STATIC_ASSERT(GL_POINTS == PIPE_PRIM_POINTS);

   STATIC_ASSERT(GL_QUADS == PIPE_PRIM_QUADS);

   STATIC_ASSERT(GL_TRIANGLE_STRIP_ADJACENCY == PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY);

   /* Avoid quadstrips if it's easy to do so:

    * Note: it's important to do the correct trimming if we change the

    * prim type!  We do that wherever this function is called.

    */

   if (prim == GL_QUAD_STRIP &&

       ctx->Light.ShadeModel != GL_FLAT &&

       ctx->Polygon.FrontMode == GL_FILL &&

       ctx->Polygon.BackMode == GL_FILL)

      prim = GL_TRIANGLE_STRIP;

   return prim;

}

/**

 * This function gets plugged into the VBO module and is called when

 * we have something to render.

 * Basically, translate the information into the format expected by gallium.

 */

void

st_draw_vbo(struct gl_context *ctx,

            const struct _mesa_prim *prims,

            GLuint nr_prims,

            const struct _mesa_index_buffer *ib,

	    GLboolean index_bounds_valid,

            GLuint min_index,

            GLuint max_index,

            struct gl_transform_feedback_object *tfb_vertcount)

{

   struct st_context *st = st_context(ctx);

   struct pipe_index_buffer ibuffer = {0};

   struct pipe_draw_info info;

   const struct gl_client_array **arrays = ctx->Array._DrawArrays;

   unsigned i;

   /* Mesa core state should have been validated already */

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

   /* Validate state. */

   if (st->dirty.st || ctx->NewDriverState) {

      st_validate_state(st);

#if 0

      if (MESA_VERBOSE & VERBOSE_GLSL) {

         check_uniforms(ctx);

      }

#else

      (void) check_uniforms;

#endif

   }

   if (st->vertex_array_out_of_memory) {

      return;

   }

   util_draw_init_info(&info);

   if (ib) {

      /* Get index bounds for user buffers. */

      if (!index_bounds_valid)

         if (!all_varyings_in_vbos(arrays))

            vbo_get_minmax_indices(ctx, prims, ib, &min_index, &max_index,

                                   nr_prims);

      if (!setup_index_buffer(st, ib, &ibuffer)) {

         _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBegin/DrawElements/DrawArray");

         return;

      }

      info.indexed = TRUE;

      if (min_index != ~0 && max_index != ~0) {

         info.min_index = min_index;

         info.max_index = max_index;

      }

      /* The VBO module handles restart for the non-indexed GLDrawArrays

       * so we only set these fields for indexed drawing:

       */

      info.primitive_restart = ctx->Array._PrimitiveRestart;

      info.restart_index = ctx->Array.RestartIndex;

   }

   else {

      /* Transform feedback drawing is always non-indexed. */

      /* Set info.count_from_stream_output. */

      if (tfb_vertcount) {

         st_transform_feedback_draw_init(tfb_vertcount, &info);

      }

   }

   /* do actual drawing */

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

      info.mode = translate_prim( ctx, prims[i].mode );

      info.start = prims[i].start;

      info.count = prims[i].count;

      info.start_instance = prims[i].base_instance;

      info.instance_count = prims[i].num_instances;

      info.index_bias = prims[i].basevertex;

      if (!ib) {

         info.min_index = info.start;

         info.max_index = info.start + info.count - 1;

      }

      if (ST_DEBUG & DEBUG_DRAW) {

         debug_printf("st/draw: mode %s  start %u  count %u  indexed %d\n",

                      u_prim_name(info.mode),

                      info.start,

                      info.count,

                      info.indexed);

      }

      if (info.count_from_stream_output) {

         cso_draw_vbo(st->cso_context, &info);

      }

      else if (info.primitive_restart) {

         /* don't trim, restarts might be inside index list */

         cso_draw_vbo(st->cso_context, &info);

      }

      else if (u_trim_pipe_prim(prims[i].mode, &info.count))

         cso_draw_vbo(st->cso_context, &info);

   }

   if (ib && st->indexbuf_uploader && !_mesa_is_bufferobj(ib->obj)) {

      pipe_resource_reference(&ibuffer.buffer, NULL);

   }

}

void

st_init_draw(struct st_context *st)

{

   struct gl_context *ctx = st->ctx;

   vbo_set_draw_func(ctx, st_draw_vbo);

   st->draw = draw_create(st->pipe); /* for selection/feedback */

   /* Disable draw options that might convert points/lines to tris, etc.

    * as that would foul-up feedback/selection mode.

    */

   draw_wide_line_threshold(st->draw, 1000.0f);

   draw_wide_point_threshold(st->draw, 1000.0f);

   draw_enable_line_stipple(st->draw, FALSE);

   draw_enable_point_sprites(st->draw, FALSE);

}

void

st_destroy_draw(struct st_context *st)

{

   draw_destroy(st->draw);

}