/**************************************************************************
 *
 * 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 "main/version.h"

#include "brw_context.h"
#include "intel_batchbuffer.h"
#include "intel_reg.h"
#include "utils.h"

/**
 * Test if we can use MI_LOAD_REGISTER_MEM from an untrusted batchbuffer.
 *
 * Some combinations of hardware and kernel versions allow this feature,
 * while others don't.  Instead of trying to enumerate every case, just
 * try and write a register and see if works.
 */
static bool
can_do_pipelined_register_writes(struct brw_context *brw)
{
   /* Supposedly, Broadwell just works. */
   if (brw->gen >= 8)
      return true;

   /* We use SO_WRITE_OFFSET0 since you're supposed to write it (unlike the
    * statistics registers), and we already reset it to zero before using it.
    */
   const int reg = GEN7_SO_WRITE_OFFSET(0);
   const int expected_value = 0x1337d0d0;
   const int offset = 100;

   /* The register we picked only exists on Gen7+. */
   assert(brw->gen == 7);

   uint32_t *data;
   /* Set a value in a BO to a known quantity.  The workaround BO already
    * exists and doesn't contain anything important, so we may as well use it.
    */
   drm_intel_bo_map(brw->batch.workaround_bo, true);
   data = brw->batch.workaround_bo->virtual;
   data[offset] = 0xffffffff;
   drm_intel_bo_unmap(brw->batch.workaround_bo);

   /* Write the register. */
   BEGIN_BATCH(3);
   OUT_BATCH(MI_LOAD_REGISTER_IMM | (3 - 2));
   OUT_BATCH(reg);
   OUT_BATCH(expected_value);
   ADVANCE_BATCH();

   intel_batchbuffer_emit_mi_flush(brw);

   /* Save the register's value back to the buffer. */
   BEGIN_BATCH(3);
   OUT_BATCH(MI_STORE_REGISTER_MEM | (3 - 2));
   OUT_BATCH(reg);
   OUT_RELOC(brw->batch.workaround_bo,
             I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
             offset * sizeof(uint32_t));
   ADVANCE_BATCH();

   intel_batchbuffer_flush(brw);

   /* Check whether the value got written. */
   drm_intel_bo_map(brw->batch.workaround_bo, false);
   bool success = data[offset] == expected_value;
   drm_intel_bo_unmap(brw->batch.workaround_bo);

   return success;
}

static bool
can_write_oacontrol(struct brw_context *brw)
{
   if (brw->gen < 6 || brw->gen >= 8)
      return false;

   /* Set "Select Context ID" to a particular address (which is likely not a
    * context), but leave all counting disabled.  This should be harmless.
    */
   const int expected_value = 0x31337000;
   const int offset = 110;

   uint32_t *data;
   /* Set a value in a BO to a known quantity.  The workaround BO already
    * exists and doesn't contain anything important, so we may as well use it.
    */
   drm_intel_bo_map(brw->batch.workaround_bo, true);
   data = brw->batch.workaround_bo->virtual;
   data[offset] = 0xffffffff;
   drm_intel_bo_unmap(brw->batch.workaround_bo);

   /* Write OACONTROL. */
   BEGIN_BATCH(3);
   OUT_BATCH(MI_LOAD_REGISTER_IMM | (3 - 2));
   OUT_BATCH(OACONTROL);
   OUT_BATCH(expected_value);
   ADVANCE_BATCH();

   intel_batchbuffer_emit_mi_flush(brw);

   /* Save the register's value back to the buffer. */
   BEGIN_BATCH(3);
   OUT_BATCH(MI_STORE_REGISTER_MEM | (3 - 2));
   OUT_BATCH(OACONTROL);
   OUT_RELOC(brw->batch.workaround_bo,
             I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
             offset * sizeof(uint32_t));
   ADVANCE_BATCH();

   intel_batchbuffer_emit_mi_flush(brw);

   /* Set OACONTROL back to zero (everything off). */
   BEGIN_BATCH(3);
   OUT_BATCH(MI_LOAD_REGISTER_IMM | (3 - 2));
   OUT_BATCH(OACONTROL);
   OUT_BATCH(0);
   ADVANCE_BATCH();

   intel_batchbuffer_flush(brw);

   /* Check whether the value got written. */
   drm_intel_bo_map(brw->batch.workaround_bo, false);
   bool success = data[offset] == expected_value;
   drm_intel_bo_unmap(brw->batch.workaround_bo);

   return success;
}

/**
 * Initializes potential list of extensions if ctx == NULL, or actually enables
 * extensions for a context.
 */
void
intelInitExtensions(struct gl_context *ctx)
{
   struct brw_context *brw = brw_context(ctx);

   assert(brw->gen >= 4);

   ctx->Extensions.ARB_depth_buffer_float = true;
   ctx->Extensions.ARB_depth_clamp = true;
   ctx->Extensions.ARB_depth_texture = true;
   ctx->Extensions.ARB_draw_elements_base_vertex = true;
   ctx->Extensions.ARB_draw_instanced = true;
   ctx->Extensions.ARB_ES2_compatibility = true;
   ctx->Extensions.ARB_explicit_attrib_location = true;
   ctx->Extensions.ARB_fragment_coord_conventions = true;
   ctx->Extensions.ARB_fragment_program = true;
   ctx->Extensions.ARB_fragment_program_shadow = true;
   ctx->Extensions.ARB_fragment_shader = true;
   ctx->Extensions.ARB_framebuffer_object = true;
   ctx->Extensions.ARB_half_float_vertex = true;
   ctx->Extensions.ARB_instanced_arrays = true;
   ctx->Extensions.ARB_internalformat_query = true;
   ctx->Extensions.ARB_map_buffer_range = true;
   ctx->Extensions.ARB_occlusion_query = true;
   ctx->Extensions.ARB_occlusion_query2 = true;
   ctx->Extensions.ARB_point_sprite = true;
   ctx->Extensions.ARB_seamless_cube_map = true;
   ctx->Extensions.ARB_shader_bit_encoding = true;
   ctx->Extensions.ARB_shader_texture_lod = true;
   ctx->Extensions.ARB_shadow = true;
   ctx->Extensions.ARB_sync = true;
   ctx->Extensions.ARB_texture_border_clamp = true;
   ctx->Extensions.ARB_texture_compression_rgtc = true;
   ctx->Extensions.ARB_texture_cube_map = true;
   ctx->Extensions.ARB_texture_env_combine = true;
   ctx->Extensions.ARB_texture_env_crossbar = true;
   ctx->Extensions.ARB_texture_env_dot3 = true;
   ctx->Extensions.ARB_texture_float = true;
   ctx->Extensions.ARB_texture_mirror_clamp_to_edge = true;
   ctx->Extensions.ARB_texture_non_power_of_two = true;
   ctx->Extensions.ARB_texture_rg = true;
   ctx->Extensions.ARB_texture_rgb10_a2ui = true;
   ctx->Extensions.ARB_vertex_program = true;
   ctx->Extensions.ARB_vertex_shader = true;
   ctx->Extensions.ARB_vertex_type_2_10_10_10_rev = true;
   ctx->Extensions.EXT_blend_color = true;
   ctx->Extensions.EXT_blend_equation_separate = true;
   ctx->Extensions.EXT_blend_func_separate = true;
   ctx->Extensions.EXT_blend_minmax = true;
   ctx->Extensions.EXT_draw_buffers2 = true;
   ctx->Extensions.EXT_framebuffer_sRGB = true;
   ctx->Extensions.EXT_gpu_program_parameters = true;
   ctx->Extensions.EXT_packed_float = true;
   ctx->Extensions.EXT_pixel_buffer_object = true;
   ctx->Extensions.EXT_point_parameters = true;
   ctx->Extensions.EXT_provoking_vertex = true;
   ctx->Extensions.EXT_separate_shader_objects = true;
   ctx->Extensions.EXT_texture_array = true;
   ctx->Extensions.EXT_texture_env_dot3 = true;
   ctx->Extensions.EXT_texture_filter_anisotropic = true;
   ctx->Extensions.EXT_texture_integer = true;
   ctx->Extensions.EXT_texture_shared_exponent = true;
   ctx->Extensions.EXT_texture_snorm = true;
   ctx->Extensions.EXT_texture_sRGB = true;
   ctx->Extensions.EXT_texture_sRGB_decode = true;
   ctx->Extensions.EXT_texture_swizzle = true;
   ctx->Extensions.EXT_stencil_two_side = true;
   ctx->Extensions.EXT_vertex_array_bgra = true;
   ctx->Extensions.AMD_seamless_cubemap_per_texture = true;
   ctx->Extensions.APPLE_object_purgeable = true;
   ctx->Extensions.ATI_envmap_bumpmap = true;
   ctx->Extensions.ATI_separate_stencil = true;
   ctx->Extensions.ATI_texture_env_combine3 = true;
   ctx->Extensions.MESA_pack_invert = true;
   ctx->Extensions.MESA_ycbcr_texture = true;
   ctx->Extensions.NV_conditional_render = true;
   ctx->Extensions.NV_primitive_restart = true;
   ctx->Extensions.NV_texture_env_combine4 = true;
   ctx->Extensions.NV_texture_rectangle = true;
   ctx->Extensions.TDFX_texture_compression_FXT1 = true;
   ctx->Extensions.OES_compressed_ETC1_RGB8_texture = true;
   ctx->Extensions.OES_EGL_image = true;
   ctx->Extensions.OES_draw_texture = true;
   ctx->Extensions.OES_standard_derivatives = true;
   ctx->Extensions.OES_EGL_image_external = true;

   if (brw->gen >= 7)
      ctx->Const.GLSLVersion = 330;
   else if (brw->gen >= 6)
      ctx->Const.GLSLVersion = 140;
   else
      ctx->Const.GLSLVersion = 120;
   _mesa_override_glsl_version(ctx);

   if (brw->gen >= 6) {
      uint64_t dummy;

      ctx->Extensions.EXT_framebuffer_multisample = true;
      ctx->Extensions.EXT_transform_feedback = true;
      ctx->Extensions.EXT_framebuffer_multisample_blit_scaled = true;
      ctx->Extensions.ARB_blend_func_extended = !driQueryOptionb(&brw->optionCache, "disable_blend_func_extended");
      ctx->Extensions.ARB_draw_buffers_blend = true;
      ctx->Extensions.ARB_ES3_compatibility = true;
      ctx->Extensions.ARB_uniform_buffer_object = true;
      ctx->Extensions.ARB_shading_language_420pack = true;
      ctx->Extensions.ARB_texture_buffer_object = true;
      ctx->Extensions.ARB_texture_buffer_object_rgb32 = true;
      ctx->Extensions.ARB_texture_buffer_range = true;
      ctx->Extensions.ARB_texture_cube_map_array = true;
      ctx->Extensions.OES_depth_texture_cube_map = true;
      ctx->Extensions.ARB_shading_language_packing = true;
      ctx->Extensions.ARB_texture_multisample = true;
      ctx->Extensions.ARB_sample_shading = true;
      ctx->Extensions.ARB_vertex_type_10f_11f_11f_rev = true;
      ctx->Extensions.ARB_texture_gather = true;

      /* Test if the kernel has the ioctl. */
      if (drm_intel_reg_read(brw->bufmgr, TIMESTAMP, &dummy) == 0)
         ctx->Extensions.ARB_timer_query = true;
   }

   if (brw->gen >= 5) {
      ctx->Extensions.ARB_texture_query_lod = true;
      ctx->Extensions.EXT_timer_query = true;
      ctx->Extensions.EXT_shader_integer_mix = ctx->Const.GLSLVersion >= 130;
      ctx->Extensions.ARB_texture_query_levels = ctx->Const.GLSLVersion >= 130;
   }

   if (brw->gen >= 7) {
      ctx->Extensions.ARB_conservative_depth = true;
      ctx->Extensions.AMD_vertex_shader_layer = true;
      if (can_do_pipelined_register_writes(brw)) {
         ctx->Extensions.ARB_transform_feedback2 = true;
         ctx->Extensions.ARB_transform_feedback3 = true;
         ctx->Extensions.ARB_transform_feedback_instanced = true;
         ctx->Extensions.ARB_draw_indirect = true;
      }

      /* Only enable this in core profile because other parts of Mesa behave
       * slightly differently when the extension is enabled.
       */
      if (ctx->API == API_OPENGL_CORE)
         ctx->Extensions.ARB_viewport_array = true;

      if (getenv("INTEL_COMPUTE_SHADER"))
         ctx->Extensions.ARB_compute_shader = true;
   }

   if (brw->gen >= 8) {
      ctx->Extensions.ARB_stencil_texturing = true;
   }

   if (brw->gen == 5 || can_write_oacontrol(brw))
      ctx->Extensions.AMD_performance_monitor = true;

   if (ctx->API == API_OPENGL_CORE)
      ctx->Extensions.ARB_base_instance = true;
   if (ctx->API != API_OPENGL_CORE)
      ctx->Extensions.ARB_color_buffer_float = true;

   if (ctx->Mesa_DXTn || driQueryOptionb(&brw->optionCache, "force_s3tc_enable"))
      ctx->Extensions.EXT_texture_compression_s3tc = true;

   ctx->Extensions.ANGLE_texture_compression_dxt = true;

   if (brw->gen >= 7)
      ctx->Extensions.ARB_shader_atomic_counters = true;
}