virglrenderer/src/vrend_decode.c

/**************************************************************************
 *
 * Copyright (C) 2014 Red Hat Inc.
 *
 * 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, sublicense,
 * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS 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 <stdint.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <epoxy/gl.h>

#include "util/u_memory.h"
#include "pipe/p_state.h"
#include "pipe/p_shader_tokens.h"
#include "vrend_renderer.h"
#include "vrend_object.h"
#include "tgsi/tgsi_text.h"

/* decode side */
#define DECODE_MAX_TOKENS 8000

struct vrend_decoder_state {
   uint32_t *buf;
   uint32_t buf_total;
   uint32_t buf_offset;
};

struct vrend_decode_ctx {
   struct vrend_decoder_state ids, *ds;
   struct vrend_context *grctx;
};
#define VREND_MAX_CTX 16
static struct vrend_decode_ctx *dec_ctx[VREND_MAX_CTX];

static inline uint32_t get_buf_entry(struct vrend_decode_ctx *ctx, uint32_t offset)
{
   return ctx->ds->buf[ctx->ds->buf_offset + offset];
}

static inline void *get_buf_ptr(struct vrend_decode_ctx *ctx,
				uint32_t offset)
{
   return &ctx->ds->buf[ctx->ds->buf_offset + offset];
}

static int vrend_decode_create_shader(struct vrend_decode_ctx *ctx, uint32_t type,
                              uint32_t handle,
   uint16_t length)
{
   struct pipe_shader_state *state;
   struct tgsi_token *tokens;
   int i, ret;
   uint32_t shader_offset;
   unsigned num_tokens;
   uint8_t *shd_text;

   if (length < 3)
      return EINVAL;

   state = CALLOC_STRUCT(pipe_shader_state);
   if (!state)
      return ENOMEM;

   num_tokens = get_buf_entry(ctx, VIRGL_OBJ_SHADER_NUM_TOKENS);

   if (num_tokens == 0)
      num_tokens = 300;

   tokens = calloc(num_tokens + 10, sizeof(struct tgsi_token));
   if (!tokens) {
      free(state);
      return ENOMEM;
   }

   state->stream_output.num_outputs = get_buf_entry(ctx, VIRGL_OBJ_SHADER_SO_NUM_OUTPUTS);
   if (state->stream_output.num_outputs) {
      for (i = 0; i < 4; i++)
         state->stream_output.stride[i] = get_buf_entry(ctx, VIRGL_OBJ_SHADER_SO_STRIDE(i));
      for (i = 0; i < state->stream_output.num_outputs; i++) {
         uint32_t tmp = get_buf_entry(ctx, VIRGL_OBJ_SHADER_SO_OUTPUT0(i));
      
         state->stream_output.output[i].register_index = tmp & 0xff;
         state->stream_output.output[i].start_component = (tmp >> 8) & 0x3;
         state->stream_output.output[i].num_components = (tmp >> 10) & 0x7;
         state->stream_output.output[i].output_buffer = (tmp >> 13) & 0x7;
         state->stream_output.output[i].dst_offset = (tmp >> 16) & 0xffff;         
      }
      shader_offset = 8 + state->stream_output.num_outputs;
   } else
      shader_offset = 4;

   shd_text = get_buf_ptr(ctx, shader_offset);
   if (vrend_dump_shaders)
      fprintf(stderr,"shader\n%s\n", shd_text);
   if (!tgsi_text_translate((const char *)shd_text, tokens, num_tokens + 10)) {
      fprintf(stderr,"failed to translate\n %s\n", shd_text);
      free(tokens);
      free(state);
      return EINVAL;
   }

   state->tokens = tokens;

   ret = vrend_create_shader(ctx->grctx, handle, state, type);

   free(tokens);
   free(state);
   return ret;
}

static int vrend_decode_create_stream_output_target(struct vrend_decode_ctx *ctx, uint32_t handle, uint16_t length)
{
   uint32_t res_handle, buffer_size, buffer_offset;

   if (length != VIRGL_OBJ_STREAMOUT_SIZE)
      return EINVAL;

   res_handle = get_buf_entry(ctx, VIRGL_OBJ_STREAMOUT_RES_HANDLE);
   buffer_offset = get_buf_entry(ctx, VIRGL_OBJ_STREAMOUT_BUFFER_OFFSET);
   buffer_size = get_buf_entry(ctx, VIRGL_OBJ_STREAMOUT_BUFFER_SIZE);

   return vrend_create_so_target(ctx->grctx, handle, res_handle, buffer_offset,
                                 buffer_size);
}

static int vrend_decode_set_framebuffer_state(struct vrend_decode_ctx *ctx, int length)
{
   uint32_t nr_cbufs = get_buf_entry(ctx, VIRGL_SET_FRAMEBUFFER_STATE_NR_CBUFS);
   uint32_t zsurf_handle = get_buf_entry(ctx, VIRGL_SET_FRAMEBUFFER_STATE_NR_ZSURF_HANDLE);
   uint32_t surf_handle[8];
   int i;

   if (length < 2)
      return EINVAL;

   if (length != (2 + nr_cbufs))
      return EINVAL;
   for (i = 0; i < nr_cbufs; i++)
      surf_handle[i] = get_buf_entry(ctx, VIRGL_SET_FRAMEBUFFER_STATE_CBUF_HANDLE(i));
   vrend_set_framebuffer_state(ctx->grctx, nr_cbufs, surf_handle, zsurf_handle);
   return 0;
}

static int vrend_decode_clear(struct vrend_decode_ctx *ctx, int length)
{
   union pipe_color_union color;
   double depth;
   unsigned stencil, buffers;
   int i;

   if (length != VIRGL_OBJ_CLEAR_SIZE)
      return EINVAL;
   buffers = get_buf_entry(ctx, VIRGL_OBJ_CLEAR_BUFFERS);
   for (i = 0; i < 4; i++)
      color.ui[i] = get_buf_entry(ctx, VIRGL_OBJ_CLEAR_COLOR_0 + i);
   depth = *(double *)(uint64_t *)get_buf_ptr(ctx, VIRGL_OBJ_CLEAR_DEPTH_0);
   stencil = get_buf_entry(ctx, VIRGL_OBJ_CLEAR_STENCIL);

   vrend_clear(ctx->grctx, buffers, &color, depth, stencil);
   return 0;
}

static float uif(unsigned int ui)
{
   union { float f; unsigned int ui; } myuif;
   myuif.ui = ui;
   return myuif.f;
}

static int vrend_decode_set_viewport_state(struct vrend_decode_ctx *ctx, int length)
{
   struct pipe_viewport_state vps;
   int i;

   if (length != VIRGL_SET_VIEWPORT_STATE_SIZE)
      return EINVAL;

   for (i = 0; i < 4; i++)
      vps.scale[i] = uif(get_buf_entry(ctx, VIRGL_SET_VIEWPORT_STATE_SCALE_0 + i));
   for (i = 0; i < 4; i++)
      vps.translate[i] = uif(get_buf_entry(ctx, VIRGL_SET_VIEWPORT_STATE_TRANSLATE_0 + i));
   
   vrend_set_viewport_state(ctx->grctx, &vps);
   return 0;
}

static int vrend_decode_set_index_buffer(struct vrend_decode_ctx *ctx, int length)
{
   if (length != 1 && length != 3)
      return EINVAL;
   vrend_set_index_buffer(ctx->grctx,
                          get_buf_entry(ctx, VIRGL_SET_INDEX_BUFFER_HANDLE),
                          (length == 3) ? get_buf_entry(ctx, VIRGL_SET_INDEX_BUFFER_INDEX_SIZE) : 0,
                          (length == 3) ? get_buf_entry(ctx, VIRGL_SET_INDEX_BUFFER_OFFSET) : 0);
   return 0;
}

static int vrend_decode_set_constant_buffer(struct vrend_decode_ctx *ctx, uint16_t length)
{
   uint32_t shader;
   uint32_t index;
   int nc = (length - 2);

   if (length < 2)
      return EINVAL;

   shader = get_buf_entry(ctx, VIRGL_SET_CONSTANT_BUFFER_SHADER_TYPE);
   index = get_buf_entry(ctx, VIRGL_SET_CONSTANT_BUFFER_INDEX);
   vrend_set_constants(ctx->grctx, shader, index, nc, get_buf_ptr(ctx, VIRGL_SET_CONSTANT_BUFFER_DATA_START));
   return 0;
}

static int vrend_decode_set_uniform_buffer(struct vrend_decode_ctx *ctx, int length)
{
   uint32_t shader = get_buf_entry(ctx, VIRGL_SET_UNIFORM_BUFFER_SHADER_TYPE);
   uint32_t index = get_buf_entry(ctx, VIRGL_SET_UNIFORM_BUFFER_INDEX);
   uint32_t offset = get_buf_entry(ctx, VIRGL_SET_UNIFORM_BUFFER_OFFSET);
   uint32_t blength = get_buf_entry(ctx, VIRGL_SET_UNIFORM_BUFFER_LENGTH);
   uint32_t handle = get_buf_entry(ctx, VIRGL_SET_UNIFORM_BUFFER_RES_HANDLE);

   if (length != VIRGL_SET_UNIFORM_BUFFER_SIZE)
      return EINVAL;
   vrend_set_uniform_buffer(ctx->grctx, shader, index, offset, blength, handle);
   return 0;
}

static int vrend_decode_set_vertex_buffers(struct vrend_decode_ctx *ctx, uint16_t length)
{
   int num_vbo;
   int i;

   if (length < 3)
      return EINVAL;

   /* must be a multiple of 3 */
   if (length % 3)
      return EINVAL;

   num_vbo = (length / 3);
  
   for (i = 0; i < num_vbo; i++) {
      vrend_set_single_vbo(ctx->grctx, i,
                           get_buf_entry(ctx, VIRGL_SET_VERTEX_BUFFER_STRIDE(i)),
                           get_buf_entry(ctx, VIRGL_SET_VERTEX_BUFFER_OFFSET(i)),
                           get_buf_entry(ctx, VIRGL_SET_VERTEX_BUFFER_HANDLE(i)));
   }
   vrend_set_num_vbo(ctx->grctx, num_vbo);
   return 0;
}

static int vrend_decode_set_sampler_views(struct vrend_decode_ctx *ctx, uint16_t length)
{
   int num_samps;
   int i;
   uint32_t shader_type, start_slot;

   if (length < 2)
      return EINVAL;
   num_samps = length - 2;
   shader_type = get_buf_entry(ctx, VIRGL_SET_SAMPLER_VIEWS_SHADER_TYPE);
   start_slot = get_buf_entry(ctx, VIRGL_SET_SAMPLER_VIEWS_START_SLOT);
   for (i = 0; i < num_samps; i++) {
      uint32_t handle = get_buf_entry(ctx, VIRGL_SET_SAMPLER_VIEWS_V0_HANDLE + i);
      vrend_set_single_sampler_view(ctx->grctx, shader_type, i + start_slot, handle);
   }
   vrend_set_num_sampler_views(ctx->grctx, shader_type, start_slot, num_samps);
   return 0;
}

static int vrend_decode_resource_inline_write(struct vrend_decode_ctx *ctx, uint16_t length)
{
   struct vrend_transfer_info info;
   struct pipe_box box;
   uint32_t res_handle = get_buf_entry(ctx, VIRGL_RESOURCE_IW_RES_HANDLE);
   uint32_t level, usage, stride, layer_stride, data_len;
   struct iovec dataiovec;
   void *data;

   if (length < 12)
      return EINVAL;

   if (length + ctx->ds->buf_offset > ctx->ds->buf_total)
     return EINVAL;

   data_len = (length - 11) * 4;
   level = get_buf_entry(ctx, VIRGL_RESOURCE_IW_LEVEL);
   usage = get_buf_entry(ctx, VIRGL_RESOURCE_IW_USAGE);
   stride = get_buf_entry(ctx, VIRGL_RESOURCE_IW_STRIDE);
   layer_stride = get_buf_entry(ctx, VIRGL_RESOURCE_IW_STRIDE);
   box.x = get_buf_entry(ctx, VIRGL_RESOURCE_IW_X);
   box.y = get_buf_entry(ctx, VIRGL_RESOURCE_IW_Y);
   box.z = get_buf_entry(ctx, VIRGL_RESOURCE_IW_Z);
   box.width = get_buf_entry(ctx, VIRGL_RESOURCE_IW_W);
   box.height = get_buf_entry(ctx, VIRGL_RESOURCE_IW_H);
   box.depth = get_buf_entry(ctx, VIRGL_RESOURCE_IW_D);

   data = get_buf_ptr(ctx, VIRGL_RESOURCE_IW_DATA_START);

   info.handle = res_handle;
   info.ctx_id = 0;
   info.level = level;
   info.stride = stride;
   info.layer_stride = layer_stride;
   info.box = &box;
   info.offset = 0;

   dataiovec.iov_base = data;
   dataiovec.iov_len = data_len;

   info.iovec = &dataiovec;
   info.iovec_cnt = 1;
   return vrend_transfer_inline_write(ctx->grctx, &info, usage);
}

static int vrend_decode_draw_vbo(struct vrend_decode_ctx *ctx, int length)
{
   struct pipe_draw_info info;

   if (length != VIRGL_DRAW_VBO_SIZE)
      return EINVAL;
   memset(&info, 0, sizeof(struct pipe_draw_info));

   info.start = get_buf_entry(ctx, VIRGL_DRAW_VBO_START);
   info.count = get_buf_entry(ctx, VIRGL_DRAW_VBO_COUNT);
   info.mode = get_buf_entry(ctx, VIRGL_DRAW_VBO_MODE);
   info.indexed = get_buf_entry(ctx, VIRGL_DRAW_VBO_INDEXED);
   info.instance_count = get_buf_entry(ctx, VIRGL_DRAW_VBO_INSTANCE_COUNT);
   info.index_bias = get_buf_entry(ctx, VIRGL_DRAW_VBO_INDEX_BIAS);
   info.start_instance = get_buf_entry(ctx, VIRGL_DRAW_VBO_START_INSTANCE);
   info.primitive_restart = get_buf_entry(ctx, VIRGL_DRAW_VBO_PRIMITIVE_RESTART);
   info.restart_index = get_buf_entry(ctx, VIRGL_DRAW_VBO_RESTART_INDEX);
   info.min_index = get_buf_entry(ctx, VIRGL_DRAW_VBO_MIN_INDEX);
   info.max_index = get_buf_entry(ctx, VIRGL_DRAW_VBO_MAX_INDEX);
   vrend_draw_vbo(ctx->grctx, &info);
   return 0;
}

static int vrend_decode_create_blend(struct vrend_decode_ctx *ctx, uint32_t handle, uint16_t length)
{
   struct pipe_blend_state *blend_state;
   uint32_t tmp;
   int i;

   if (length != VIRGL_OBJ_BLEND_SIZE) {
      return EINVAL;
   }

   blend_state = CALLOC_STRUCT(pipe_blend_state);
   if (!blend_state)
      return ENOMEM;

   tmp = get_buf_entry(ctx, VIRGL_OBJ_BLEND_S0);
   blend_state->independent_blend_enable = (tmp & 1);
   blend_state->logicop_enable = (tmp >> 1) & 0x1;
   blend_state->dither = (tmp >> 2) & 0x1;
   blend_state->alpha_to_coverage = (tmp >> 3) & 0x1;
   blend_state->alpha_to_one = (tmp >> 4) & 0x1;

   tmp = get_buf_entry(ctx, VIRGL_OBJ_BLEND_S1);
   blend_state->logicop_func = tmp & 0xf;

   for (i = 0; i < PIPE_MAX_COLOR_BUFS; i++) {
      tmp = get_buf_entry(ctx, VIRGL_OBJ_BLEND_S2(i));
      blend_state->rt[i].blend_enable = tmp & 0x1;
      blend_state->rt[i].rgb_func = (tmp >> 1) & 0x7;
      blend_state->rt[i].rgb_src_factor = (tmp >> 4) & 0x1f;
      blend_state->rt[i].rgb_dst_factor = (tmp >> 9) & 0x1f;
      blend_state->rt[i].alpha_func = (tmp >> 14) & 0x7;
      blend_state->rt[i].alpha_src_factor = (tmp >> 17) & 0x1f;
      blend_state->rt[i].alpha_dst_factor = (tmp >> 22) & 0x1f;
      blend_state->rt[i].colormask = (tmp >> 27) & 0xf;
   }

   tmp = vrend_renderer_object_insert(ctx->grctx, blend_state, sizeof(struct pipe_blend_state), handle,
                                      VIRGL_OBJECT_BLEND);
   if (tmp == 0) {
      FREE(blend_state);
      return ENOMEM;
   }
   return 0;
}

static int vrend_decode_create_dsa(struct vrend_decode_ctx *ctx, uint32_t handle, uint16_t length)
{
   int i;
   struct pipe_depth_stencil_alpha_state *dsa_state;
   uint32_t tmp;

   if (length != VIRGL_OBJ_DSA_SIZE)
      return EINVAL;

   dsa_state = CALLOC_STRUCT(pipe_depth_stencil_alpha_state);
   if (!dsa_state)
      return ENOMEM;
   
   tmp = get_buf_entry(ctx, VIRGL_OBJ_DSA_S0);
   dsa_state->depth.enabled = tmp & 0x1;
   dsa_state->depth.writemask = (tmp >> 1) & 0x1;
   dsa_state->depth.func = (tmp >> 2) & 0x7;

   dsa_state->alpha.enabled = (tmp >> 8) & 0x1;
   dsa_state->alpha.func = (tmp >> 9) & 0x7;

   for (i = 0; i < 2; i++) {
      tmp = get_buf_entry(ctx, VIRGL_OBJ_DSA_S1 + i);
      dsa_state->stencil[i].enabled = tmp & 0x1;
      dsa_state->stencil[i].func = (tmp >> 1) & 0x7;
      dsa_state->stencil[i].fail_op = (tmp >> 4) & 0x7;
      dsa_state->stencil[i].zpass_op = (tmp >> 7) & 0x7;
      dsa_state->stencil[i].zfail_op = (tmp >> 10) & 0x7;
      dsa_state->stencil[i].valuemask = (tmp >> 13) & 0xff;
      dsa_state->stencil[i].writemask = (tmp >> 21) & 0xff;
   }

   tmp = get_buf_entry(ctx, VIRGL_OBJ_DSA_ALPHA_REF);
   dsa_state->alpha.ref_value = uif(tmp);

   tmp = vrend_renderer_object_insert(ctx->grctx, dsa_state, sizeof(struct pipe_depth_stencil_alpha_state), handle,
                                      VIRGL_OBJECT_DSA);
   if (tmp == 0) {
      FREE(dsa_state);
      return ENOMEM;
   }
   return 0;
}

static int vrend_decode_create_rasterizer(struct vrend_decode_ctx *ctx, uint32_t handle, uint16_t length)
{
   struct pipe_rasterizer_state *rs_state;
   uint32_t tmp;

   if (length != VIRGL_OBJ_RS_SIZE)
      return EINVAL;

   rs_state = CALLOC_STRUCT(pipe_rasterizer_state);
   if (!rs_state)
      return ENOMEM;

   tmp = get_buf_entry(ctx, VIRGL_OBJ_RS_S0);
#define ebit(name, bit) rs_state->name = (tmp >> bit) & 0x1
#define emask(name, bit, mask) rs_state->name = (tmp >> bit) & mask

   ebit(flatshade, 0);
   ebit(depth_clip, 1);
   ebit(clip_halfz, 2);
   ebit(rasterizer_discard, 3);
   ebit(flatshade_first, 4);
   ebit(light_twoside, 5);
   ebit(sprite_coord_mode, 6);
   ebit(point_quad_rasterization, 7);
   emask(cull_face, 8, 0x3);
   emask(fill_front, 10, 0x3);
   emask(fill_back, 12, 0x3);
   ebit(scissor, 14);
   ebit(front_ccw, 15);
   ebit(clamp_vertex_color, 16);
   ebit(clamp_fragment_color, 17);
   ebit(offset_line, 18);
   ebit(offset_point, 19);
   ebit(offset_tri, 20);
   ebit(poly_smooth, 21);
   ebit(poly_stipple_enable, 22);
   ebit(point_smooth, 23);
   ebit(point_size_per_vertex, 24);
   ebit(multisample, 25);
   ebit(line_smooth, 26);
   ebit(line_stipple_enable, 27);
   ebit(line_last_pixel, 28);
   ebit(half_pixel_center, 29);
   ebit(bottom_edge_rule, 30);
   rs_state->point_size = uif(get_buf_entry(ctx, VIRGL_OBJ_RS_POINT_SIZE));
   rs_state->sprite_coord_enable = get_buf_entry(ctx, VIRGL_OBJ_RS_SPRITE_COORD_ENABLE);
   tmp = get_buf_entry(ctx, VIRGL_OBJ_RS_S3);
   emask(line_stipple_pattern, 0, 0xffff);
   emask(line_stipple_factor, 16, 0xff);
   emask(clip_plane_enable, 24, 0xff);

   rs_state->line_width = uif(get_buf_entry(ctx, VIRGL_OBJ_RS_LINE_WIDTH));
   rs_state->offset_units = uif(get_buf_entry(ctx, VIRGL_OBJ_RS_OFFSET_UNITS));
   rs_state->offset_scale = uif(get_buf_entry(ctx, VIRGL_OBJ_RS_OFFSET_SCALE));
   rs_state->offset_clamp = uif(get_buf_entry(ctx, VIRGL_OBJ_RS_OFFSET_CLAMP));
   
   tmp = vrend_renderer_object_insert(ctx->grctx, rs_state, sizeof(struct pipe_rasterizer_state), handle,
                      VIRGL_OBJECT_RASTERIZER);
   if (tmp == 0) {
      FREE(rs_state);
      return ENOMEM;
   }
   return 0;
}

static int vrend_decode_create_surface(struct vrend_decode_ctx *ctx, uint32_t handle, uint16_t length)
{
   uint32_t res_handle, format, val0, val1;
   int ret;

   if (length != VIRGL_OBJ_SURFACE_SIZE)
      return EINVAL;
   
   res_handle = get_buf_entry(ctx, VIRGL_OBJ_SURFACE_RES_HANDLE);
   format = get_buf_entry(ctx, VIRGL_OBJ_SURFACE_FORMAT);
   /* decide later if these are texture or buffer */
   val0 = get_buf_entry(ctx, VIRGL_OBJ_SURFACE_BUFFER_FIRST_ELEMENT);
   val1 = get_buf_entry(ctx, VIRGL_OBJ_SURFACE_BUFFER_LAST_ELEMENT);
   ret = vrend_create_surface(ctx->grctx, handle, res_handle, format, val0, val1);
   return ret;
}

static int vrend_decode_create_sampler_view(struct vrend_decode_ctx *ctx, uint32_t handle, uint16_t length)
{
   uint32_t res_handle, format, val0, val1, swizzle_packed;

   if (length != VIRGL_OBJ_SAMPLER_VIEW_SIZE)
      return EINVAL;
   
   res_handle = get_buf_entry(ctx, VIRGL_OBJ_SAMPLER_VIEW_RES_HANDLE);
   format = get_buf_entry(ctx, VIRGL_OBJ_SAMPLER_VIEW_FORMAT);
   val0 = get_buf_entry(ctx, VIRGL_OBJ_SAMPLER_VIEW_BUFFER_FIRST_ELEMENT);
   val1 = get_buf_entry(ctx, VIRGL_OBJ_SAMPLER_VIEW_BUFFER_LAST_ELEMENT);
   swizzle_packed = get_buf_entry(ctx, VIRGL_OBJ_SAMPLER_VIEW_SWIZZLE);
   return vrend_create_sampler_view(ctx->grctx, handle, res_handle, format, val0, val1,swizzle_packed);
}

static int vrend_decode_create_sampler_state(struct vrend_decode_ctx *ctx, uint32_t handle, uint16_t length)
{
   struct pipe_sampler_state state;
   int i;
   uint32_t tmp;

   if (length != VIRGL_OBJ_SAMPLER_STATE_SIZE)
      return EINVAL;
   tmp = get_buf_entry(ctx, VIRGL_OBJ_SAMPLER_STATE_S0);
   state.wrap_s = tmp & 0x7;
   state.wrap_t = (tmp >> 3) & 0x7;
   state.wrap_r = (tmp >> 6) & 0x7;
   state.min_img_filter = (tmp >> 9) & 0x3;
   state.min_mip_filter = (tmp >> 11) & 0x3;
   state.mag_img_filter = (tmp >> 13) & 0x3;
   state.compare_mode = (tmp >> 15) & 0x1;
   state.compare_func = (tmp >> 16) & 0x7;

   state.lod_bias = uif(get_buf_entry(ctx, VIRGL_OBJ_SAMPLER_STATE_LOD_BIAS));
   state.min_lod = uif(get_buf_entry(ctx, VIRGL_OBJ_SAMPLER_STATE_MIN_LOD));
   state.max_lod = uif(get_buf_entry(ctx, VIRGL_OBJ_SAMPLER_STATE_MAX_LOD));

   for (i = 0; i < 4; i++)
      state.border_color.ui[i] = get_buf_entry(ctx, VIRGL_OBJ_SAMPLER_STATE_BORDER_COLOR(i));
   return vrend_create_sampler_state(ctx->grctx, handle, &state);
}

static int vrend_decode_create_ve(struct vrend_decode_ctx *ctx, uint32_t handle, uint16_t length)
{
   struct pipe_vertex_element *ve = NULL;
   int num_elements;
   int i;
   int ret;

   if (length < 1)
      return EINVAL;

   if ((length - 1) % 4)
      return EINVAL;

   num_elements = (length - 1) / 4;

   if (num_elements) {
       ve = calloc(num_elements, sizeof(struct pipe_vertex_element));

       if (!ve)
           return ENOMEM;

       for (i = 0; i < num_elements; i++) {
           ve[i].src_offset = get_buf_entry(ctx, VIRGL_OBJ_VERTEX_ELEMENTS_V0_SRC_OFFSET(i));
           ve[i].instance_divisor = get_buf_entry(ctx, VIRGL_OBJ_VERTEX_ELEMENTS_V0_INSTANCE_DIVISOR(i));
           ve[i].vertex_buffer_index = get_buf_entry(ctx, VIRGL_OBJ_VERTEX_ELEMENTS_V0_VERTEX_BUFFER_INDEX(i));
           ve[i].src_format = get_buf_entry(ctx, VIRGL_OBJ_VERTEX_ELEMENTS_V0_SRC_FORMAT(i));
       }
   }

   ret = vrend_create_vertex_elements_state(ctx->grctx, handle, num_elements, ve);

   FREE(ve);
   return ret;
}

static int vrend_decode_create_query(struct vrend_decode_ctx *ctx, uint32_t handle, uint16_t length)
{
   uint32_t query_type;
   uint32_t res_handle;
   uint32_t offset;

   if (length != VIRGL_OBJ_QUERY_SIZE)
      return EINVAL;
   
   query_type = get_buf_entry(ctx, VIRGL_OBJ_QUERY_TYPE);
   offset = get_buf_entry(ctx, VIRGL_OBJ_QUERY_OFFSET);
   res_handle = get_buf_entry(ctx, VIRGL_OBJ_QUERY_RES_HANDLE);

   return vrend_create_query(ctx->grctx, handle, query_type, res_handle, offset);
}

static int vrend_decode_create_object(struct vrend_decode_ctx *ctx, int length)
{
   uint32_t header = get_buf_entry(ctx, VIRGL_OBJ_CREATE_HEADER);
   uint32_t handle = get_buf_entry(ctx, VIRGL_OBJ_CREATE_HANDLE);
   uint8_t obj_type = (header >> 8) & 0xff;
   int ret = 0;

   if (length < 1)
       return EINVAL;

   switch (obj_type){
   case VIRGL_OBJECT_BLEND:
      ret = vrend_decode_create_blend(ctx, handle, length);
      break;
   case VIRGL_OBJECT_DSA:
      ret = vrend_decode_create_dsa(ctx, handle, length);
      break;
   case VIRGL_OBJECT_RASTERIZER:
      ret = vrend_decode_create_rasterizer(ctx, handle, length);
      break;
   case VIRGL_OBJECT_VS:
   case VIRGL_OBJECT_GS:
   case VIRGL_OBJECT_FS:
      ret = vrend_decode_create_shader(ctx, obj_type, handle, length);
      break;
   case VIRGL_OBJECT_VERTEX_ELEMENTS:
      ret = vrend_decode_create_ve(ctx, handle, length);
      break;
   case VIRGL_OBJECT_SURFACE:
      ret = vrend_decode_create_surface(ctx, handle, length);
      break;
   case VIRGL_OBJECT_SAMPLER_VIEW:
      ret = vrend_decode_create_sampler_view(ctx, handle, length);
      break;
   case VIRGL_OBJECT_SAMPLER_STATE:
      ret = vrend_decode_create_sampler_state(ctx, handle, length);
      break;
   case VIRGL_OBJECT_QUERY:
      ret = vrend_decode_create_query(ctx, handle, length);
      break;
   case VIRGL_OBJECT_STREAMOUT_TARGET:
      ret = vrend_decode_create_stream_output_target(ctx, handle, length);
      break;
   default:
      return EINVAL;
   }

   return ret;
}

static int vrend_decode_bind_object(struct vrend_decode_ctx *ctx, uint16_t length)
{
   uint32_t header = get_buf_entry(ctx, VIRGL_OBJ_BIND_HEADER);
   uint32_t handle = get_buf_entry(ctx, VIRGL_OBJ_BIND_HANDLE);
   uint8_t obj_type = (header >> 8) & 0xff;

   if (length != 1)
      return EINVAL;

   switch (obj_type) {
   case VIRGL_OBJECT_BLEND:
      vrend_object_bind_blend(ctx->grctx, handle);
      break;
   case VIRGL_OBJECT_DSA:
      vrend_object_bind_dsa(ctx->grctx, handle);
      break;
   case VIRGL_OBJECT_RASTERIZER:
      vrend_object_bind_rasterizer(ctx->grctx, handle);
      break;
   case VIRGL_OBJECT_VS:
      vrend_bind_vs(ctx->grctx, handle);
      break;
   case VIRGL_OBJECT_GS:
      vrend_bind_gs(ctx->grctx, handle);
      break;
   case VIRGL_OBJECT_FS:
      vrend_bind_fs(ctx->grctx, handle);
      break;
   case VIRGL_OBJECT_VERTEX_ELEMENTS:
      vrend_bind_vertex_elements_state(ctx->grctx, handle);
      break;
   default:
      return EINVAL;
   }

   return 0;
}

static int vrend_decode_destroy_object(struct vrend_decode_ctx *ctx, int length)
{
   uint32_t handle = get_buf_entry(ctx, VIRGL_OBJ_DESTROY_HANDLE);

   if (length != 1)
      return EINVAL;

   vrend_renderer_object_destroy(ctx->grctx, handle);
   return 0;
}

static int vrend_decode_set_stencil_ref(struct vrend_decode_ctx *ctx, int length)
{
   struct pipe_stencil_ref ref;
   uint32_t val = get_buf_entry(ctx, VIRGL_SET_STENCIL_REF);

   if (length != VIRGL_SET_STENCIL_REF_SIZE)
      return EINVAL;
   
   ref.ref_value[0] = val & 0xff;
   ref.ref_value[1] = (val >> 8) & 0xff;
   vrend_set_stencil_ref(ctx->grctx, &ref);
   return 0;
}

static int vrend_decode_set_blend_color(struct vrend_decode_ctx *ctx, int length)
{
   struct pipe_blend_color color;
   int i;

   if (length != VIRGL_SET_BLEND_COLOR_SIZE)
      return EINVAL;
   
   for (i = 0; i < 4; i++)
      color.color[i] = uif(get_buf_entry(ctx, VIRGL_SET_BLEND_COLOR(i)));

   vrend_set_blend_color(ctx->grctx, &color);
   return 0;
}

static int vrend_decode_set_scissor_state(struct vrend_decode_ctx *ctx, int length)
{
   struct pipe_scissor_state ss;
   uint32_t temp;

   if (length != VIRGL_SET_SCISSOR_STATE_SIZE)
      return EINVAL;

   temp = get_buf_entry(ctx, VIRGL_SET_SCISSOR_MINX_MINY);
   ss.minx = temp & 0xffff;
   ss.miny = (temp >> 16) & 0xffff;

   temp = get_buf_entry(ctx, VIRGL_SET_SCISSOR_MAXX_MAXY);
   ss.maxx = temp & 0xffff;
   ss.maxy = (temp >> 16) & 0xffff;

   vrend_set_scissor_state(ctx->grctx, &ss);
   return 0;
}

static int vrend_decode_set_polygon_stipple(struct vrend_decode_ctx *ctx, int length)
{
   struct pipe_poly_stipple ps;
   int i;

   if (length != VIRGL_POLYGON_STIPPLE_SIZE)
      return EINVAL;

   for (i = 0; i < 32; i++)
      ps.stipple[i] = get_buf_entry(ctx, VIRGL_POLYGON_STIPPLE_P0 + i);

   vrend_set_polygon_stipple(ctx->grctx, &ps);
   return 0;
}

static int vrend_decode_set_clip_state(struct vrend_decode_ctx *ctx, int length)
{
   struct pipe_clip_state clip;
   int i, j;

   if (length != VIRGL_SET_CLIP_STATE_SIZE)
      return EINVAL;

   for (i = 0; i < 8; i++)
      for (j = 0; j < 4; j++)
         clip.ucp[i][j] = uif(get_buf_entry(ctx, VIRGL_SET_CLIP_STATE_C0 + (i * 4) + j));
   vrend_set_clip_state(ctx->grctx, &clip);
   return 0;
}

static int vrend_decode_set_sample_mask(struct vrend_decode_ctx *ctx, int length)
{
   unsigned mask;

   if (length != VIRGL_SET_SAMPLE_MASK_SIZE)
      return EINVAL;
   mask = get_buf_entry(ctx, VIRGL_SET_SAMPLE_MASK_MASK);
   vrend_set_sample_mask(ctx->grctx, mask);
   return 0;
}

static int vrend_decode_resource_copy_region(struct vrend_decode_ctx *ctx, int length)
{
   struct pipe_box box;
   uint32_t dst_handle, src_handle;
   uint32_t dst_level, dstx, dsty, dstz;
   uint32_t src_level;

   if (length != VIRGL_CMD_RESOURCE_COPY_REGION_SIZE)
      return EINVAL;
   
   dst_handle = get_buf_entry(ctx, VIRGL_CMD_RCR_DST_RES_HANDLE);
   dst_level = get_buf_entry(ctx, VIRGL_CMD_RCR_DST_LEVEL);
   dstx = get_buf_entry(ctx, VIRGL_CMD_RCR_DST_X);
   dsty = get_buf_entry(ctx, VIRGL_CMD_RCR_DST_Y);
   dstz = get_buf_entry(ctx, VIRGL_CMD_RCR_DST_Z);
   src_handle = get_buf_entry(ctx, VIRGL_CMD_RCR_SRC_RES_HANDLE);
   src_level = get_buf_entry(ctx, VIRGL_CMD_RCR_SRC_LEVEL);
   box.x = get_buf_entry(ctx, VIRGL_CMD_RCR_SRC_X);
   box.y = get_buf_entry(ctx, VIRGL_CMD_RCR_SRC_Y);
   box.z = get_buf_entry(ctx, VIRGL_CMD_RCR_SRC_Z);
   box.width = get_buf_entry(ctx, VIRGL_CMD_RCR_SRC_W);
   box.height = get_buf_entry(ctx, VIRGL_CMD_RCR_SRC_H);
   box.depth = get_buf_entry(ctx, VIRGL_CMD_RCR_SRC_D);

   vrend_renderer_resource_copy_region(ctx->grctx, dst_handle,
                                      dst_level, dstx, dsty, dstz,
                                      src_handle, src_level,
                                      &box);
   return 0;
}


static int vrend_decode_blit(struct vrend_decode_ctx *ctx, int length)
{
   struct pipe_blit_info info;
   uint32_t dst_handle, src_handle, temp;

   if (length != VIRGL_CMD_BLIT_SIZE)
      return EINVAL;
   temp = get_buf_entry(ctx, VIRGL_CMD_BLIT_S0);
   info.mask = temp & 0xff;
   info.filter = (temp >> 8) & 0x3;
   info.scissor_enable = (temp >> 10) & 0x1;
   temp = get_buf_entry(ctx, VIRGL_CMD_BLIT_SCISSOR_MINX_MINY);
   info.scissor.minx = temp & 0xffff;
   info.scissor.miny = (temp >> 16) & 0xffff;
   temp = get_buf_entry(ctx, VIRGL_CMD_BLIT_SCISSOR_MAXX_MAXY);
   info.scissor.maxx = temp & 0xffff;
   info.scissor.maxy = (temp >> 16) & 0xffff;
   dst_handle = get_buf_entry(ctx, VIRGL_CMD_BLIT_DST_RES_HANDLE);
   info.dst.level = get_buf_entry(ctx, VIRGL_CMD_BLIT_DST_LEVEL);
   info.dst.format = get_buf_entry(ctx, VIRGL_CMD_BLIT_DST_FORMAT);
   info.dst.box.x = get_buf_entry(ctx, VIRGL_CMD_BLIT_DST_X);
   info.dst.box.y = get_buf_entry(ctx, VIRGL_CMD_BLIT_DST_Y);
   info.dst.box.z = get_buf_entry(ctx, VIRGL_CMD_BLIT_DST_Z);
   info.dst.box.width = get_buf_entry(ctx, VIRGL_CMD_BLIT_DST_W);
   info.dst.box.height = get_buf_entry(ctx, VIRGL_CMD_BLIT_DST_H);
   info.dst.box.depth = get_buf_entry(ctx, VIRGL_CMD_BLIT_DST_D);

   src_handle = get_buf_entry(ctx, VIRGL_CMD_BLIT_SRC_RES_HANDLE);
   info.src.level = get_buf_entry(ctx, VIRGL_CMD_BLIT_SRC_LEVEL);
   info.src.format = get_buf_entry(ctx, VIRGL_CMD_BLIT_SRC_FORMAT);
   info.src.box.x = get_buf_entry(ctx, VIRGL_CMD_BLIT_SRC_X);
   info.src.box.y = get_buf_entry(ctx, VIRGL_CMD_BLIT_SRC_Y);
   info.src.box.z = get_buf_entry(ctx, VIRGL_CMD_BLIT_SRC_Z);
   info.src.box.width = get_buf_entry(ctx, VIRGL_CMD_BLIT_SRC_W);
   info.src.box.height = get_buf_entry(ctx, VIRGL_CMD_BLIT_SRC_H);
   info.src.box.depth = get_buf_entry(ctx, VIRGL_CMD_BLIT_SRC_D);

   vrend_renderer_blit(ctx->grctx, dst_handle, src_handle, &info);
   return 0;
}

static int vrend_decode_bind_sampler_states(struct vrend_decode_ctx *ctx, int length)
{
   uint32_t shader_type = get_buf_entry(ctx, VIRGL_BIND_SAMPLER_STATES_SHADER_TYPE);
   uint32_t start_slot = get_buf_entry(ctx, VIRGL_BIND_SAMPLER_STATES_START_SLOT);
   uint32_t num_states = length - 2;

   if (length < 2)
      return EINVAL;

   vrend_bind_sampler_states(ctx->grctx, shader_type, start_slot, num_states,
			     get_buf_ptr(ctx, VIRGL_BIND_SAMPLER_STATES_S0_HANDLE));
   return 0;
}

static int vrend_decode_begin_query(struct vrend_decode_ctx *ctx, int length)
{
   uint32_t handle = get_buf_entry(ctx, VIRGL_QUERY_BEGIN_HANDLE);

   if (length != 1)
      return EINVAL;

   vrend_begin_query(ctx->grctx, handle);
   return 0;
}

static int vrend_decode_end_query(struct vrend_decode_ctx *ctx, int length)
{
   uint32_t handle = get_buf_entry(ctx, VIRGL_QUERY_END_HANDLE);

   if (length != 1)
      return EINVAL;

   vrend_end_query(ctx->grctx, handle);
   return 0;
}

static int vrend_decode_get_query_result(struct vrend_decode_ctx *ctx, int length)
{
   uint32_t handle = get_buf_entry(ctx, VIRGL_QUERY_RESULT_HANDLE);
   uint32_t wait = get_buf_entry(ctx, VIRGL_QUERY_RESULT_WAIT);

   if (length != 2)
      return EINVAL;
   vrend_get_query_result(ctx->grctx, handle, wait);
   return 0;
}

static int vrend_decode_set_render_condition(struct vrend_decode_ctx *ctx, int length)
{
   uint32_t handle = get_buf_entry(ctx, VIRGL_RENDER_CONDITION_HANDLE);
   boolean condition = get_buf_entry(ctx, VIRGL_RENDER_CONDITION_CONDITION) & 1;
   uint mode = get_buf_entry(ctx, VIRGL_RENDER_CONDITION_MODE);

   if (length != VIRGL_RENDER_CONDITION_SIZE)
      return EINVAL;
   vrend_render_condition(ctx->grctx, handle, condition, mode);
   return 0;
}

static int vrend_decode_set_sub_ctx(struct vrend_decode_ctx *ctx, int length)
{
   uint32_t ctx_sub_id = get_buf_entry(ctx, 1);

   if (length != 1)
      return EINVAL;
   vrend_renderer_set_sub_ctx(ctx->grctx, ctx_sub_id);
   return 0;
}

static int vrend_decode_create_sub_ctx(struct vrend_decode_ctx *ctx, int length)
{
   uint32_t ctx_sub_id = get_buf_entry(ctx, 1);

   if (length != 1)
      return EINVAL;
   vrend_renderer_create_sub_ctx(ctx->grctx, ctx_sub_id);
   return 0;
}

static int vrend_decode_destroy_sub_ctx(struct vrend_decode_ctx *ctx, int length)
{
   uint32_t ctx_sub_id = get_buf_entry(ctx, 1);

   if (length != 1)
      return EINVAL;
   vrend_renderer_destroy_sub_ctx(ctx->grctx, ctx_sub_id);
   return 0;
}

static int vrend_decode_set_streamout_targets(struct vrend_decode_ctx *ctx,
                                              uint16_t length)
{
   uint32_t handles[16];
   uint32_t num_handles = length - 1;
   uint32_t append_bitmask;
   int i;

   if (length < 1)
      return EINVAL;
   append_bitmask = get_buf_entry(ctx, VIRGL_SET_STREAMOUT_TARGETS_APPEND_BITMASK);
   for (i = 0; i < num_handles; i++)
      handles[i] = get_buf_entry(ctx, VIRGL_SET_STREAMOUT_TARGETS_H0 + i);
   vrend_set_streamout_targets(ctx->grctx, append_bitmask, num_handles, handles);
   return 0;
}

void vrend_renderer_context_create_internal(uint32_t handle, uint32_t nlen,
                                           const char *debug_name)
{
   struct vrend_decode_ctx *dctx;

   if (handle > VREND_MAX_CTX)
      return;
   
   dctx = malloc(sizeof(struct vrend_decode_ctx));
   if (!dctx)
       return;
   
   dctx->grctx = vrend_create_context(handle, nlen, debug_name);
   if (!dctx->grctx) {
      free(dctx);
      return;
   }

   dctx->ds = &dctx->ids;

   dec_ctx[handle] = dctx;
}

int vrend_renderer_context_create(uint32_t handle, uint32_t nlen, const char *debug_name)
{
   if (handle > VREND_MAX_CTX)
      return EINVAL;
   /* context 0 is always available with no guarantees */
   if (handle == 0)
      return EINVAL;

   vrend_renderer_context_create_internal(handle, nlen, debug_name);
   return 0;
}

void vrend_renderer_context_destroy(uint32_t handle)
{
   struct vrend_decode_ctx *ctx;
   bool ret;

   if (handle > VREND_MAX_CTX)
      return;

   ctx = dec_ctx[handle];
   if (!ctx)
     return;
   dec_ctx[handle] = NULL;
   ret = vrend_destroy_context(ctx->grctx);
   free(ctx);
   /* switch to ctx 0 */
   if (ret && handle != 0)
       vrend_hw_switch_context(dec_ctx[0]->grctx, TRUE);
}

struct vrend_context *vrend_lookup_renderer_ctx(uint32_t ctx_id)
{
   if (ctx_id > VREND_MAX_CTX)
      return NULL;

   if (dec_ctx[ctx_id] == NULL)
      return NULL;

   return dec_ctx[ctx_id]->grctx;
}

int vrend_decode_block(uint32_t ctx_id, uint32_t *block, int ndw)
{
   struct vrend_decode_ctx *gdctx;
   boolean bret;
   int ret;
   if (ctx_id > VREND_MAX_CTX)
      return EINVAL;

   if (dec_ctx[ctx_id] == NULL)
      return EINVAL;

   gdctx = dec_ctx[ctx_id];

   bret = vrend_hw_switch_context(gdctx->grctx, TRUE);
   if (bret == FALSE)
      return EINVAL;

   gdctx->ds->buf = block;
   gdctx->ds->buf_total = ndw;
   gdctx->ds->buf_offset = 0;

   while (gdctx->ds->buf_offset < gdctx->ds->buf_total) {
      uint32_t header = gdctx->ds->buf[gdctx->ds->buf_offset];
      uint32_t len = header >> 16;

      ret = 0;
      /* check if the guest is doing something bad */
      if (gdctx->ds->buf_offset + len + 1 > gdctx->ds->buf_total) {
         vrend_report_buffer_error(gdctx->grctx, 0);
         break;
      }
//      fprintf(stderr,"[%d] cmd is %d (obj %d) len %d\n", gdctx->ds->buf_offset, header & 0xff, (header >> 8 & 0xff), (len));
      
      switch (header & 0xff) {
      case VIRGL_CCMD_CREATE_OBJECT:
         ret = vrend_decode_create_object(gdctx, len);
         break;
      case VIRGL_CCMD_BIND_OBJECT:
         ret = vrend_decode_bind_object(gdctx, len);
         break;
      case VIRGL_CCMD_DESTROY_OBJECT:
         ret = vrend_decode_destroy_object(gdctx, len);
         break;
      case VIRGL_CCMD_CLEAR:
         ret = vrend_decode_clear(gdctx, len);
         break;
      case VIRGL_CCMD_DRAW_VBO:
         ret = vrend_decode_draw_vbo(gdctx, len);
         break;
      case VIRGL_CCMD_SET_FRAMEBUFFER_STATE:
         ret = vrend_decode_set_framebuffer_state(gdctx, len);
         break;
      case VIRGL_CCMD_SET_VERTEX_BUFFERS:
         ret = vrend_decode_set_vertex_buffers(gdctx, len);
         break;
      case VIRGL_CCMD_RESOURCE_INLINE_WRITE:
         ret = vrend_decode_resource_inline_write(gdctx, len);
         break;
      case VIRGL_CCMD_SET_VIEWPORT_STATE:
         ret = vrend_decode_set_viewport_state(gdctx, len);
         break;
      case VIRGL_CCMD_SET_SAMPLER_VIEWS:
         ret = vrend_decode_set_sampler_views(gdctx, len);
         break;
      case VIRGL_CCMD_SET_INDEX_BUFFER:
         ret = vrend_decode_set_index_buffer(gdctx, len);
         break;
      case VIRGL_CCMD_SET_CONSTANT_BUFFER:
         ret = vrend_decode_set_constant_buffer(gdctx, len);
         break;
      case VIRGL_CCMD_SET_STENCIL_REF:
         ret = vrend_decode_set_stencil_ref(gdctx, len);
         break;
      case VIRGL_CCMD_SET_BLEND_COLOR:
         ret = vrend_decode_set_blend_color(gdctx, len);
         break;
      case VIRGL_CCMD_SET_SCISSOR_STATE:
         ret = vrend_decode_set_scissor_state(gdctx, len);
         break;
      case VIRGL_CCMD_BLIT:
         ret = vrend_decode_blit(gdctx, len);
         break;
      case VIRGL_CCMD_RESOURCE_COPY_REGION:
         ret = vrend_decode_resource_copy_region(gdctx, len);
         break;
      case VIRGL_CCMD_BIND_SAMPLER_STATES:
         ret = vrend_decode_bind_sampler_states(gdctx, len);
         break;
      case VIRGL_CCMD_BEGIN_QUERY:
         ret = vrend_decode_begin_query(gdctx, len);
         break;
      case VIRGL_CCMD_END_QUERY:
         ret = vrend_decode_end_query(gdctx, len);
         break;
      case VIRGL_CCMD_GET_QUERY_RESULT:
         ret = vrend_decode_get_query_result(gdctx, len);
         break;
      case VIRGL_CCMD_SET_POLYGON_STIPPLE:
         ret = vrend_decode_set_polygon_stipple(gdctx, len);
         break;
      case VIRGL_CCMD_SET_CLIP_STATE:
         ret = vrend_decode_set_clip_state(gdctx, len);
         break;
      case VIRGL_CCMD_SET_SAMPLE_MASK:
         ret = vrend_decode_set_sample_mask(gdctx, len);
         break;
      case VIRGL_CCMD_SET_STREAMOUT_TARGETS:
         ret = vrend_decode_set_streamout_targets(gdctx, len);
         break;
      case VIRGL_CCMD_SET_RENDER_CONDITION:
	 ret = vrend_decode_set_render_condition(gdctx, len);
	 break;
      case VIRGL_CCMD_SET_UNIFORM_BUFFER:
         ret = vrend_decode_set_uniform_buffer(gdctx, len);
         break;
      case VIRGL_CCMD_SET_SUB_CTX:
         ret = vrend_decode_set_sub_ctx(gdctx, len);
         break;
      case VIRGL_CCMD_CREATE_SUB_CTX:
         ret = vrend_decode_create_sub_ctx(gdctx, len);
         break;
      case VIRGL_CCMD_DESTROY_SUB_CTX:
         ret = vrend_decode_destroy_sub_ctx(gdctx, len);
         break;
      }

      if (ret == EINVAL) {
         vrend_report_buffer_error(gdctx->grctx, header);
         goto out;
      }
      if (ret == ENOMEM)
	goto out;
      gdctx->ds->buf_offset += (len) + 1;
   }
   return 0;
out:
   return ret;
}

void vrend_decode_reset(bool ctx_0_only)
{
   int i;

   vrend_hw_switch_context(dec_ctx[0]->grctx, TRUE);

   if (ctx_0_only == false) {
     for (i = 1; i < VREND_MAX_CTX; i++) {
       if (!dec_ctx[i])
         continue;

       if (!dec_ctx[i]->grctx)
         continue;

       vrend_destroy_context(dec_ctx[i]->grctx);
       free(dec_ctx[i]);
       dec_ctx[i] = NULL;
     }
   } else {
     vrend_destroy_context(dec_ctx[0]->grctx);
     free(dec_ctx[0]);
     dec_ctx[0] = NULL;
   }
}