/**************************************************************************
 *
 * 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 "i915_batch.h"
#include "i915_context.h"
#include "i915_debug.h"
#include "i915_fpc.h"
#include "i915_reg.h"
#include "i915_resource.h"

#include "pipe/p_context.h"
#include "pipe/p_defines.h"
#include "util/format/u_formats.h"

#include "util/format/u_format.h"
#include "util/u_math.h"
#include "util/u_memory.h"

static void
validate_flush(struct i915_context *i915, unsigned *batch_space)
{
   *batch_space = i915->flush_dirty ? 1 : 0;
}

static void
emit_flush(struct i915_context *i915)
{
   /* Cache handling is very cheap atm. State handling can request to flushes:
    * - I915_FLUSH_CACHE which is a flush everything request and
    * - I915_PIPELINE_FLUSH which is specifically for the draw_offset flush.
    * Because the cache handling is so dumb, no explicit "invalidate map cache".
    * Also, the first is a strict superset of the latter, so the following logic
    * works. */
   if (i915->flush_dirty & I915_FLUSH_CACHE)
      OUT_BATCH(MI_FLUSH | FLUSH_MAP_CACHE);
   else if (i915->flush_dirty & I915_PIPELINE_FLUSH)
      OUT_BATCH(MI_FLUSH | INHIBIT_FLUSH_RENDER_CACHE);
}

uint32_t invariant_state[] = {
   _3DSTATE_AA_CMD | AA_LINE_ECAAR_WIDTH_ENABLE | AA_LINE_ECAAR_WIDTH_1_0 |
      AA_LINE_REGION_WIDTH_ENABLE | AA_LINE_REGION_WIDTH_1_0,

   _3DSTATE_DFLT_DIFFUSE_CMD, 0,

   _3DSTATE_DFLT_SPEC_CMD, 0,

   _3DSTATE_DFLT_Z_CMD, 0,

   _3DSTATE_COORD_SET_BINDINGS | CSB_TCB(0, 0) | CSB_TCB(1, 1) | CSB_TCB(2, 2) |
      CSB_TCB(3, 3) | CSB_TCB(4, 4) | CSB_TCB(5, 5) | CSB_TCB(6, 6) |
      CSB_TCB(7, 7),

   _3DSTATE_RASTER_RULES_CMD | ENABLE_POINT_RASTER_RULE |
      OGL_POINT_RASTER_RULE | ENABLE_LINE_STRIP_PROVOKE_VRTX |
      ENABLE_TRI_FAN_PROVOKE_VRTX | LINE_STRIP_PROVOKE_VRTX(1) |
      TRI_FAN_PROVOKE_VRTX(2) | ENABLE_TEXKILL_3D_4D | TEXKILL_4D,

   _3DSTATE_DEPTH_SUBRECT_DISABLE,

   /* disable indirect state for now
    */
   _3DSTATE_LOAD_INDIRECT | 0, 0};

static void
emit_invariant(struct i915_context *i915)
{
   i915_winsys_batchbuffer_write(
      i915->batch, invariant_state,
      ARRAY_SIZE(invariant_state) * sizeof(uint32_t));
}

static void
validate_immediate(struct i915_context *i915, unsigned *batch_space)
{
   unsigned dirty = (1 << I915_IMMEDIATE_S0 | 1 << I915_IMMEDIATE_S1 |
                     1 << I915_IMMEDIATE_S2 | 1 << I915_IMMEDIATE_S3 |
                     1 << I915_IMMEDIATE_S3 | 1 << I915_IMMEDIATE_S4 |
                     1 << I915_IMMEDIATE_S5 | 1 << I915_IMMEDIATE_S6) &
                    i915->immediate_dirty;

   if (i915->immediate_dirty & (1 << I915_IMMEDIATE_S0) && i915->vbo)
      i915->validation_buffers[i915->num_validation_buffers++] = i915->vbo;

   *batch_space = 1 + util_bitcount(dirty);
}

static void
emit_immediate_s5(struct i915_context *i915, uint32_t imm)
{
   struct i915_surface *surf = i915_surface(i915->framebuffer.cbufs[0]);

   if (surf) {
      uint32_t writemask = imm & S5_WRITEDISABLE_MASK;
      imm &= ~S5_WRITEDISABLE_MASK;

      /* The register bits are not in order. */
      static const uint32_t writedisables[4] = {
         S5_WRITEDISABLE_RED,
         S5_WRITEDISABLE_GREEN,
         S5_WRITEDISABLE_BLUE,
         S5_WRITEDISABLE_ALPHA,
      };

      for (int i = 0; i < 4; i++) {
         if (writemask & writedisables[surf->color_swizzle[i]])
            imm |= writedisables[i];
      }
   }

   OUT_BATCH(imm);
}

static void
emit_immediate(struct i915_context *i915)
{
   /* remove unwanted bits and S7 */
   unsigned dirty = (1 << I915_IMMEDIATE_S0 | 1 << I915_IMMEDIATE_S1 |
                     1 << I915_IMMEDIATE_S2 | 1 << I915_IMMEDIATE_S3 |
                     1 << I915_IMMEDIATE_S3 | 1 << I915_IMMEDIATE_S4 |
                     1 << I915_IMMEDIATE_S5 | 1 << I915_IMMEDIATE_S6) &
                    i915->immediate_dirty;
   int i, num = util_bitcount(dirty);
   assert(num && num <= I915_MAX_IMMEDIATE);

   OUT_BATCH(_3DSTATE_LOAD_STATE_IMMEDIATE_1 | dirty << 4 | (num - 1));

   if (i915->immediate_dirty & (1 << I915_IMMEDIATE_S0)) {
      if (i915->vbo)
         OUT_RELOC(i915->vbo, I915_USAGE_VERTEX,
                   i915->current.immediate[I915_IMMEDIATE_S0]);
      else
         OUT_BATCH(0);
   }

   for (i = 1; i < I915_MAX_IMMEDIATE; i++) {
      if (dirty & (1 << i)) {
         if (i == I915_IMMEDIATE_S5)
            emit_immediate_s5(i915, i915->current.immediate[i]);
         else
            OUT_BATCH(i915->current.immediate[i]);
      }
   }
}

static void
validate_dynamic(struct i915_context *i915, unsigned *batch_space)
{
   *batch_space =
      util_bitcount(i915->dynamic_dirty & ((1 << I915_MAX_DYNAMIC) - 1));
}

static void
emit_dynamic(struct i915_context *i915)
{
   int i;
   for (i = 0; i < I915_MAX_DYNAMIC; i++) {
      if (i915->dynamic_dirty & (1 << i))
         OUT_BATCH(i915->current.dynamic[i]);
   }
}

static void
validate_static(struct i915_context *i915, unsigned *batch_space)
{
   *batch_space = 0;

   if (i915->current.cbuf_bo && (i915->static_dirty & I915_DST_BUF_COLOR)) {
      i915->validation_buffers[i915->num_validation_buffers++] =
         i915->current.cbuf_bo;
      *batch_space += 3;
   }

   if (i915->current.depth_bo && (i915->static_dirty & I915_DST_BUF_DEPTH)) {
      i915->validation_buffers[i915->num_validation_buffers++] =
         i915->current.depth_bo;
      *batch_space += 3;
   }

   if (i915->static_dirty & I915_DST_VARS)
      *batch_space += 2;

   if (i915->static_dirty & I915_DST_RECT)
      *batch_space += 5;
}

static void
emit_static(struct i915_context *i915)
{
   if (i915->current.cbuf_bo && (i915->static_dirty & I915_DST_BUF_COLOR)) {
      OUT_BATCH(_3DSTATE_BUF_INFO_CMD);
      OUT_BATCH(i915->current.cbuf_flags);
      OUT_RELOC(i915->current.cbuf_bo, I915_USAGE_RENDER, i915->current.cbuf_offset);
   }

   /* What happens if no zbuf??
    */
   if (i915->current.depth_bo && (i915->static_dirty & I915_DST_BUF_DEPTH)) {
      OUT_BATCH(_3DSTATE_BUF_INFO_CMD);
      OUT_BATCH(i915->current.depth_flags);
      OUT_RELOC(i915->current.depth_bo, I915_USAGE_RENDER, 0);
   }

   if (i915->static_dirty & I915_DST_VARS) {
      OUT_BATCH(_3DSTATE_DST_BUF_VARS_CMD);
      OUT_BATCH(i915->current.dst_buf_vars);
   }
}

static void
validate_map(struct i915_context *i915, unsigned *batch_space)
{
   const uint32_t enabled = i915->current.sampler_enable_flags;
   uint32_t unit;
   struct i915_texture *tex;

   *batch_space = i915->current.sampler_enable_nr
                     ? 2 + 3 * i915->current.sampler_enable_nr
                     : 0;

   for (unit = 0; unit < I915_TEX_UNITS; unit++) {
      if (enabled & (1 << unit)) {
         tex = i915_texture(i915->fragment_sampler_views[unit]->texture);
         i915->validation_buffers[i915->num_validation_buffers++] = tex->buffer;
      }
   }
}

static void
emit_map(struct i915_context *i915)
{
   const uint32_t nr = i915->current.sampler_enable_nr;
   if (nr) {
      const uint32_t enabled = i915->current.sampler_enable_flags;
      uint32_t unit;
      uint32_t count = 0;
      OUT_BATCH(_3DSTATE_MAP_STATE | (3 * nr));
      OUT_BATCH(enabled);
      for (unit = 0; unit < I915_TEX_UNITS; unit++) {
         if (enabled & (1 << unit)) {
            struct i915_texture *texture =
               i915_texture(i915->fragment_sampler_views[unit]->texture);
            struct i915_winsys_buffer *buf = texture->buffer;
            unsigned offset = i915->current.texbuffer[unit][2];

            assert(buf);

            count++;

            OUT_RELOC(buf, I915_USAGE_SAMPLER, offset);
            OUT_BATCH(i915->current.texbuffer[unit][0]); /* MS3 */
            OUT_BATCH(i915->current.texbuffer[unit][1]); /* MS4 */
         }
      }
      assert(count == nr);
   }
}

static void
validate_sampler(struct i915_context *i915, unsigned *batch_space)
{
   *batch_space = i915->current.sampler_enable_nr
                     ? 2 + 3 * i915->current.sampler_enable_nr
                     : 0;
}

static void
emit_sampler(struct i915_context *i915)
{
   if (i915->current.sampler_enable_nr) {
      int i;

      OUT_BATCH(_3DSTATE_SAMPLER_STATE | (3 * i915->current.sampler_enable_nr));

      OUT_BATCH(i915->current.sampler_enable_flags);

      for (i = 0; i < I915_TEX_UNITS; i++) {
         if (i915->current.sampler_enable_flags & (1 << i)) {
            OUT_BATCH(i915->current.sampler[i][0]);
            OUT_BATCH(i915->current.sampler[i][1]);
            OUT_BATCH(i915->current.sampler[i][2]);
         }
      }
   }
}

static void
validate_constants(struct i915_context *i915, unsigned *batch_space)
{
   int nr = i915->fs->num_constants ? 2 + 4 * i915->fs->num_constants : 0;

   *batch_space = nr;
}

static void
emit_constants(struct i915_context *i915)
{
   /* Collate the user-defined constants with the fragment shader's
    * immediates according to the constant_flags[] array.
    */
   const uint32_t nr = i915->fs->num_constants;

   assert(nr <= I915_MAX_CONSTANT);
   if (nr) {
      uint32_t i;

      OUT_BATCH(_3DSTATE_PIXEL_SHADER_CONSTANTS | (nr * 4));
      OUT_BATCH((1 << nr) - 1);

      for (i = 0; i < nr; i++) {
         const uint32_t *c;
         if (i915->fs->constant_flags[i] == I915_CONSTFLAG_USER) {
            /* grab user-defined constant */
            c = (uint32_t *)i915_buffer(i915->constants[PIPE_SHADER_FRAGMENT])
                   ->data;
            c += 4 * i;
         } else {
            /* emit program constant */
            c = (uint32_t *)i915->fs->constants[i];
         }
#if 0 /* debug */
         {
            float *f = (float *) c;
            printf("Const %2d: %f %f %f %f %s\n", i, f[0], f[1], f[2], f[3],
                   (i915->fs->constant_flags[i] == I915_CONSTFLAG_USER
                    ? "user" : "immediate"));
         }
#endif
         OUT_BATCH(*c++);
         OUT_BATCH(*c++);
         OUT_BATCH(*c++);
         OUT_BATCH(*c++);
      }
   }
}

static void
validate_program(struct i915_context *i915, unsigned *batch_space)
{
   /* we need more batch space if we want to emulate rgba framebuffers */
   *batch_space = i915->fs->program_len + (i915->current.fixup_swizzle ? 3 : 0);
}

static void
emit_program(struct i915_context *i915)
{
   /* we should always have, at least, a pass-through program */
   assert(i915->fs->program_len > 0);

   /* If we're doing a fixup swizzle, that's 3 more dwords to add. */
   uint32_t additional_size = 0;
   if (i915->current.fixup_swizzle)
      additional_size = 3;

   /* output the program: 1 dword of header, then 3 dwords per decl/instruction */
   assert(i915->fs->program_len % 3 == 1);

   /* first word has the size, adjust it for fixup swizzle */
   OUT_BATCH(i915->fs->program[0] + additional_size);

   for (int i = 1; i < i915->fs->program_len; i++)
      OUT_BATCH(i915->fs->program[i]);

   /* we emit an additional mov with swizzle to fake RGBA framebuffers */
   if (i915->current.fixup_swizzle) {
      /* mov out_color, out_color.zyxw */
      OUT_BATCH(A0_MOV | (REG_TYPE_OC << A0_DEST_TYPE_SHIFT) |
                A0_DEST_CHANNEL_ALL | (REG_TYPE_OC << A0_SRC0_TYPE_SHIFT) |
                (T_DIFFUSE << A0_SRC0_NR_SHIFT));
      OUT_BATCH(i915->current.fixup_swizzle);
      OUT_BATCH(0);
   }
}

static void
emit_draw_rect(struct i915_context *i915)
{
   if (i915->static_dirty & I915_DST_RECT) {
      OUT_BATCH(_3DSTATE_DRAW_RECT_CMD);
      OUT_BATCH(DRAW_RECT_DIS_DEPTH_OFS);
      OUT_BATCH(i915->current.draw_offset);
      OUT_BATCH(i915->current.draw_size);
      OUT_BATCH(i915->current.draw_offset);
   }
}

static bool
i915_validate_state(struct i915_context *i915, unsigned *batch_space)
{
   unsigned tmp;

   i915->num_validation_buffers = 0;
   if (i915->hardware_dirty & I915_HW_INVARIANT)
      *batch_space = ARRAY_SIZE(invariant_state);
   else
      *batch_space = 0;

#if 0
static int counter_total = 0;
#define VALIDATE_ATOM(atom, hw_dirty)                                          \
   if (i915->hardware_dirty & hw_dirty) {                                      \
      static int counter_##atom = 0;                                           \
      validate_##atom(i915, &tmp);                                             \
      *batch_space += tmp;                                                     \
      counter_##atom += tmp;                                                   \
      counter_total += tmp;                                                    \
      printf("%s: \t%d/%d \t%2.2f\n", #atom, counter_##atom, counter_total,    \
             counter_##atom * 100.f / counter_total);                          \
   }
#else
#define VALIDATE_ATOM(atom, hw_dirty)                                          \
   if (i915->hardware_dirty & hw_dirty) {                                      \
      validate_##atom(i915, &tmp);                                             \
      *batch_space += tmp;                                                     \
   }
#endif
   VALIDATE_ATOM(flush, I915_HW_FLUSH);
   VALIDATE_ATOM(immediate, I915_HW_IMMEDIATE);
   VALIDATE_ATOM(dynamic, I915_HW_DYNAMIC);
   VALIDATE_ATOM(static, I915_HW_STATIC);
   VALIDATE_ATOM(map, I915_HW_MAP);
   VALIDATE_ATOM(sampler, I915_HW_SAMPLER);
   VALIDATE_ATOM(constants, I915_HW_CONSTANTS);
   VALIDATE_ATOM(program, I915_HW_PROGRAM);
#undef VALIDATE_ATOM

   if (i915->num_validation_buffers == 0)
      return true;

   if (!i915_winsys_validate_buffers(i915->batch, i915->validation_buffers,
                                     i915->num_validation_buffers))
      return false;

   return true;
}

/* Push the state into the sarea and/or texture memory.
 */
void
i915_emit_hardware_state(struct i915_context *i915)
{
   unsigned batch_space;
   uintptr_t save_ptr;

   assert(i915->dirty == 0);

   if (I915_DBG_ON(DBG_ATOMS))
      i915_dump_hardware_dirty(i915, __func__);

   if (!i915_validate_state(i915, &batch_space)) {
      FLUSH_BATCH(NULL, I915_FLUSH_ASYNC);
      assert(i915_validate_state(i915, &batch_space));
   }

   if (!BEGIN_BATCH(batch_space)) {
      FLUSH_BATCH(NULL, I915_FLUSH_ASYNC);
      assert(i915_validate_state(i915, &batch_space));
      assert(BEGIN_BATCH(batch_space));
   }

   save_ptr = (uintptr_t)i915->batch->ptr;

#define EMIT_ATOM(atom, hw_dirty)                                              \
   if (i915->hardware_dirty & hw_dirty)                                        \
      emit_##atom(i915);
   EMIT_ATOM(flush, I915_HW_FLUSH);
   EMIT_ATOM(invariant, I915_HW_INVARIANT);
   EMIT_ATOM(immediate, I915_HW_IMMEDIATE);
   EMIT_ATOM(dynamic, I915_HW_DYNAMIC);
   EMIT_ATOM(static, I915_HW_STATIC);
   EMIT_ATOM(map, I915_HW_MAP);
   EMIT_ATOM(sampler, I915_HW_SAMPLER);
   EMIT_ATOM(constants, I915_HW_CONSTANTS);
   EMIT_ATOM(program, I915_HW_PROGRAM);
   EMIT_ATOM(draw_rect, I915_HW_STATIC);
#undef EMIT_ATOM

   I915_DBG(DBG_EMIT, "%s: used %lu dwords, %d dwords reserved\n", __func__,
            ((uintptr_t)i915->batch->ptr - save_ptr) / 4, batch_space);
   assert(((uintptr_t)i915->batch->ptr - save_ptr) / 4 == batch_space);

   i915->hardware_dirty = 0;
   i915->immediate_dirty = 0;
   i915->dynamic_dirty = 0;
   i915->static_dirty = 0;
   i915->flush_dirty = 0;
}
