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/*

 * Copyright © 2013 Intel Corporation

 *

 * 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 (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 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.

 */

extern "C" {

#include "main/teximage.h"

#include "main/blend.h"

#include "main/fbobject.h"

#include "main/renderbuffer.h"

}

#include "glsl/ralloc.h"

#include "intel_fbo.h"

#include "brw_blorp.h"

#include "brw_context.h"

#include "brw_eu.h"

#include "brw_state.h"

#define FILE_DEBUG_FLAG DEBUG_BLORP

struct brw_blorp_const_color_prog_key

{

   bool use_simd16_replicated_data;

   bool pad[3];

};

/**

 * Parameters for a blorp operation where the fragment shader outputs a

 * constant color.  This is used for both fast color clears and color

 * resolves.

 */

class brw_blorp_const_color_params : public brw_blorp_params

{

public:

   virtual uint32_t get_wm_prog(struct brw_context *brw,

                                brw_blorp_prog_data **prog_data) const;

protected:

   brw_blorp_const_color_prog_key wm_prog_key;

};

class brw_blorp_clear_params : public brw_blorp_const_color_params

{

public:

   brw_blorp_clear_params(struct brw_context *brw,

                          struct gl_framebuffer *fb,

                          struct gl_renderbuffer *rb,

                          GLubyte *color_mask,

                          bool partial_clear);

};

/**

 * Parameters for a blorp operation that performs a "render target resolve".

 * This is used to resolve pending fast clear pixels before a color buffer is

 * used for texturing, ReadPixels, or scanout.

 */

class brw_blorp_rt_resolve_params : public brw_blorp_const_color_params

{

public:

   brw_blorp_rt_resolve_params(struct brw_context *brw,

                               struct intel_mipmap_tree *mt);

};

class brw_blorp_const_color_program

{

public:

   brw_blorp_const_color_program(struct brw_context *brw,

                                 const brw_blorp_const_color_prog_key *key);

   ~brw_blorp_const_color_program();

   const GLuint *compile(struct brw_context *brw, GLuint *program_size);

   brw_blorp_prog_data prog_data;

private:

   void alloc_regs();

   void *mem_ctx;

   struct brw_context *brw;

   const brw_blorp_const_color_prog_key *key;

   struct brw_compile func;

   /* Thread dispatch header */

   struct brw_reg R0;

   /* Pixel X/Y coordinates (always in R1). */

   struct brw_reg R1;

   /* Register with push constants (a single vec4) */

   struct brw_reg clear_rgba;

   /* MRF used for render target writes */

   GLuint base_mrf;

};

brw_blorp_const_color_program::brw_blorp_const_color_program(

      struct brw_context *brw,

      const brw_blorp_const_color_prog_key *key)

   : mem_ctx(ralloc_context(NULL)),

     brw(brw),

     key(key),

     R0(),

     R1(),

     clear_rgba(),

     base_mrf(0)

{

   brw_init_compile(brw, &func, mem_ctx);

}

brw_blorp_const_color_program::~brw_blorp_const_color_program()

{

   ralloc_free(mem_ctx);

}

/**

 * Determine if fast color clear supports the given clear color.

 *

 * Fast color clear can only clear to color values of 1.0 or 0.0.  At the

 * moment we only support floating point, unorm, and snorm buffers.

 */

static bool

is_color_fast_clear_compatible(struct brw_context *brw,

                               gl_format format,

                               const union gl_color_union *color)

{

   if (_mesa_is_format_integer_color(format))

      return false;

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

      if (color->f[i] != 0.0 && color->f[i] != 1.0) {

         perf_debug("Clear color unsupported by fast color clear.  "

                    "Falling back to slow clear.\n");

         return false;

      }

   }

   return true;

}

/**

 * Convert the given color to a bitfield suitable for ORing into DWORD 7 of

 * SURFACE_STATE.

 */

static uint32_t

compute_fast_clear_color_bits(const union gl_color_union *color)

{

   uint32_t bits = 0;

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

      if (color->f[i] != 0.0)

         bits |= 1 << (GEN7_SURFACE_CLEAR_COLOR_SHIFT + (3 - i));

   }

   return bits;

}

brw_blorp_clear_params::brw_blorp_clear_params(struct brw_context *brw,

                                               struct gl_framebuffer *fb,

                                               struct gl_renderbuffer *rb,

                                               GLubyte *color_mask,

                                               bool partial_clear)

{

   struct gl_context *ctx = &brw->ctx;

   struct intel_renderbuffer *irb = intel_renderbuffer(rb);

   dst.set(brw, irb->mt, irb->mt_level, irb->mt_layer);

   /* Override the surface format according to the context's sRGB rules. */

   gl_format format = _mesa_get_render_format(ctx, irb->mt->format);

   dst.brw_surfaceformat = brw->render_target_format[format];

   x0 = fb->_Xmin;

   x1 = fb->_Xmax;

   if (rb->Name != 0) {

      y0 = fb->_Ymin;

      y1 = fb->_Ymax;

   } else {

      y0 = rb->Height - fb->_Ymax;

      y1 = rb->Height - fb->_Ymin;

   }

   float *push_consts = (float *)&wm_push_consts;

   push_consts[0] = ctx->Color.ClearColor.f[0];

   push_consts[1] = ctx->Color.ClearColor.f[1];

   push_consts[2] = ctx->Color.ClearColor.f[2];

   push_consts[3] = ctx->Color.ClearColor.f[3];

   use_wm_prog = true;

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

   wm_prog_key.use_simd16_replicated_data = true;

   /* From the SNB PRM (Vol4_Part1):

    *

    *     "Replicated data (Message Type = 111) is only supported when

    *      accessing tiled memory.  Using this Message Type to access linear

    *      (untiled) memory is UNDEFINED."

    */

   if (irb->mt->region->tiling == I915_TILING_NONE)

      wm_prog_key.use_simd16_replicated_data = false;

   /* Constant color writes ignore everyting in blend and color calculator

    * state.  This is not documented.

    */

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

      if (!color_mask[i]) {

         color_write_disable[i] = true;

         wm_prog_key.use_simd16_replicated_data = false;

      }

   }

   /* If we can do this as a fast color clear, do so. */

   if (irb->mt->mcs_state != INTEL_MCS_STATE_NONE && !partial_clear &&

       wm_prog_key.use_simd16_replicated_data &&

       is_color_fast_clear_compatible(brw, format, &ctx->Color.ClearColor)) {

      memset(push_consts, 0xff, 4*sizeof(float));

      fast_clear_op = GEN7_FAST_CLEAR_OP_FAST_CLEAR;

      /* From the Ivy Bridge PRM, Vol2 Part1 11.7 "MCS Buffer for Render

       * Target(s)", beneath the "Fast Color Clear" bullet (p327):

       *

       *     Clear pass must have a clear rectangle that must follow alignment

       *     rules in terms of pixels and lines as shown in the table

       *     below. Further, the clear-rectangle height and width must be

       *     multiple of the following dimensions. If the height and width of

       *     the render target being cleared do not meet these requirements,

       *     an MCS buffer can be created such that it follows the requirement

       *     and covers the RT.

       *

       * The alignment size in the table that follows is related to the

       * alignment size returned by intel_get_non_msrt_mcs_alignment(), but

       * with X alignment multiplied by 16 and Y alignment multiplied by 32.

       */

      unsigned x_align, y_align;

      intel_get_non_msrt_mcs_alignment(brw, irb->mt, &x_align, &y_align);

      x_align *= 16;

      y_align *= 32;

         /* From BSpec: 3D-Media-GPGPU Engine > 3D Pipeline > Pixel > Pixel

       * Backend > MCS Buffer for Render Target(s) [DevIVB+] > Table "Color

       * Clear of Non-MultiSampled Render Target Restrictions":

       *

       *   Clear rectangle must be aligned to two times the number of pixels in

       *   the table shown below due to 16x16 hashing across the slice.

          */

         x0 = ROUND_DOWN_TO(x0, 2 * x_align);

         y0 = ROUND_DOWN_TO(y0, 2 * y_align);

         x1 = ALIGN(x1, 2 * x_align);

         y1 = ALIGN(y1, 2 * y_align);

      /* From the Ivy Bridge PRM, Vol2 Part1 11.7 "MCS Buffer for Render

       * Target(s)", beneath the "Fast Color Clear" bullet (p327):

       *

       *     In order to optimize the performance MCS buffer (when bound to 1X

       *     RT) clear similarly to MCS buffer clear for MSRT case, clear rect

       *     is required to be scaled by the following factors in the

       *     horizontal and vertical directions:

       *

       * The X and Y scale down factors in the table that follows are each

       * equal to half the alignment value computed above.

       */

      unsigned x_scaledown = x_align / 2;

      unsigned y_scaledown = y_align / 2;

      x0 /= x_scaledown;

      y0 /= y_scaledown;

      x1 /= x_scaledown;

      y1 /= y_scaledown;

   }

}

brw_blorp_rt_resolve_params::brw_blorp_rt_resolve_params(

      struct brw_context *brw,

      struct intel_mipmap_tree *mt)

{

   dst.set(brw, mt, 0 /* level */, 0 /* layer */);

   /* From the Ivy Bridge PRM, Vol2 Part1 11.9 "Render Target Resolve":

    *

    *     A rectangle primitive must be scaled down by the following factors

    *     with respect to render target being resolved.

    *

    * The scaledown factors in the table that follows are related to the

    * alignment size returned by intel_get_non_msrt_mcs_alignment(), but with

    * X and Y alignment each divided by 2.

    */

   unsigned x_align, y_align;

   intel_get_non_msrt_mcs_alignment(brw, mt, &x_align, &y_align);

   unsigned x_scaledown = x_align / 2;

   unsigned y_scaledown = y_align / 2;

   x0 = y0 = 0;

   x1 = ALIGN(mt->logical_width0, x_scaledown) / x_scaledown;

   y1 = ALIGN(mt->logical_height0, y_scaledown) / y_scaledown;

   fast_clear_op = GEN7_FAST_CLEAR_OP_RESOLVE;

   /* Note: there is no need to initialize push constants because it doesn't

    * matter what data gets dispatched to the render target.  However, we must

    * ensure that the fragment shader delivers the data using the "replicated

    * color" message.

    */

   use_wm_prog = true;

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

   wm_prog_key.use_simd16_replicated_data = true;

}

uint32_t

brw_blorp_const_color_params::get_wm_prog(struct brw_context *brw,

                                          brw_blorp_prog_data **prog_data)

   const

{

   uint32_t prog_offset = 0;

   if (!brw_search_cache(&brw->cache, BRW_BLORP_CONST_COLOR_PROG,

                         &this->wm_prog_key, sizeof(this->wm_prog_key),

                         &prog_offset, prog_data)) {

      brw_blorp_const_color_program prog(brw, &this->wm_prog_key);

      GLuint program_size;

      const GLuint *program = prog.compile(brw, &program_size);

      brw_upload_cache(&brw->cache, BRW_BLORP_CONST_COLOR_PROG,

                       &this->wm_prog_key, sizeof(this->wm_prog_key),

                       program, program_size,

                       &prog.prog_data, sizeof(prog.prog_data),

                       &prog_offset, prog_data);

   }

   return prog_offset;

}

void

brw_blorp_const_color_program::alloc_regs()

{

   int reg = 0;

   this->R0 = retype(brw_vec8_grf(reg++, 0), BRW_REGISTER_TYPE_UW);

   this->R1 = retype(brw_vec8_grf(reg++, 0), BRW_REGISTER_TYPE_UW);

   prog_data.first_curbe_grf = reg;

   clear_rgba = retype(brw_vec4_grf(reg++, 0), BRW_REGISTER_TYPE_F);

   reg += BRW_BLORP_NUM_PUSH_CONST_REGS;

   /* Make sure we didn't run out of registers */

   assert(reg <= GEN7_MRF_HACK_START);

   this->base_mrf = 2;

}

const GLuint *

brw_blorp_const_color_program::compile(struct brw_context *brw,

                                       GLuint *program_size)

{

   /* Set up prog_data */

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

   prog_data.persample_msaa_dispatch = false;

   alloc_regs();

   brw_set_compression_control(&func, BRW_COMPRESSION_NONE);

   struct brw_reg mrf_rt_write =

      retype(vec16(brw_message_reg(base_mrf)), BRW_REGISTER_TYPE_F);

   uint32_t mlen, msg_type;

   if (key->use_simd16_replicated_data) {

      /* The message payload is a single register with the low 4 floats/ints

       * filled with the constant clear color.

       */

      brw_set_mask_control(&func, BRW_MASK_DISABLE);

      brw_MOV(&func, vec4(brw_message_reg(base_mrf)), clear_rgba);

      brw_set_mask_control(&func, BRW_MASK_ENABLE);

      msg_type = BRW_DATAPORT_RENDER_TARGET_WRITE_SIMD16_SINGLE_SOURCE_REPLICATED;

      mlen = 1;

   } else {

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

         /* The message payload is pairs of registers for 16 pixels each of r,

          * g, b, and a.

          */

         brw_set_compression_control(&func, BRW_COMPRESSION_COMPRESSED);

         brw_MOV(&func,

                 brw_message_reg(base_mrf + i * 2),

                 brw_vec1_grf(clear_rgba.nr, i));

         brw_set_compression_control(&func, BRW_COMPRESSION_NONE);

      }

      msg_type = BRW_DATAPORT_RENDER_TARGET_WRITE_SIMD16_SINGLE_SOURCE;

      mlen = 8;

   }

   /* Now write to the render target and terminate the thread */

   brw_fb_WRITE(&func,

                16 /* dispatch_width */,

                base_mrf /* msg_reg_nr */,

                mrf_rt_write /* src0 */,

                msg_type,

                BRW_BLORP_RENDERBUFFER_BINDING_TABLE_INDEX,

                mlen,

                true /* eot */,

                false /* header present */);

   if (unlikely(INTEL_DEBUG & DEBUG_BLORP)) {

      printf("Native code for BLORP clear:\n");

      brw_dump_compile(&func, stdout, 0, func.next_insn_offset);

      printf("\n");

   }

   return brw_get_program(&func, program_size);

}

extern "C" {

bool

brw_blorp_clear_color(struct brw_context *brw, struct gl_framebuffer *fb,

                      bool partial_clear)

{

   struct gl_context *ctx = &brw->ctx;

   /* The constant color clear code doesn't work for multisampled surfaces, so

    * we need to support falling back to other clear mechanisms.

    * Unfortunately, our clear code is based on a bitmask that doesn't

    * distinguish individual color attachments, so we walk the attachments to

    * see if any require fallback, and fall back for all if any of them need

    * to.

    */

   for (unsigned buf = 0; buf < ctx->DrawBuffer->_NumColorDrawBuffers; buf++) {

      struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[buf];

      struct intel_renderbuffer *irb = intel_renderbuffer(rb);

      if (irb && irb->mt->msaa_layout != INTEL_MSAA_LAYOUT_NONE)

         return false;

   }

   for (unsigned buf = 0; buf < ctx->DrawBuffer->_NumColorDrawBuffers; buf++) {

      struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[buf];

      struct intel_renderbuffer *irb = intel_renderbuffer(rb);

      /* If this is an ES2 context or GL_ARB_ES2_compatibility is supported,

       * the framebuffer can be complete with some attachments missing.  In

       * this case the _ColorDrawBuffers pointer will be NULL.

       */

      if (rb == NULL)

         continue;

      brw_blorp_clear_params params(brw, fb, rb, ctx->Color.ColorMask[buf],

                                    partial_clear);

      bool is_fast_clear =

         (params.fast_clear_op == GEN7_FAST_CLEAR_OP_FAST_CLEAR);

      if (is_fast_clear) {

         /* Record the clear color in the miptree so that it will be

          * programmed in SURFACE_STATE by later rendering and resolve

          * operations.

          */

         uint32_t new_color_value =

            compute_fast_clear_color_bits(&ctx->Color.ClearColor);

         if (irb->mt->fast_clear_color_value != new_color_value) {

            irb->mt->fast_clear_color_value = new_color_value;

            brw->state.dirty.brw |= BRW_NEW_SURFACES;

         }

         /* If the buffer is already in INTEL_MCS_STATE_CLEAR, the clear is

          * redundant and can be skipped.

          */

         if (irb->mt->mcs_state == INTEL_MCS_STATE_CLEAR)

            continue;

         /* If the MCS buffer hasn't been allocated yet, we need to allocate

          * it now.

          */

         if (!irb->mt->mcs_mt) {

            if (!intel_miptree_alloc_non_msrt_mcs(brw, irb->mt)) {

               /* MCS allocation failed--probably this will only happen in

                * out-of-memory conditions.  But in any case, try to recover

                * by falling back to a non-blorp clear technique.

                */

               return false;

            }

            brw->state.dirty.brw |= BRW_NEW_SURFACES;

         }

      }

      DBG("%s to mt %p level %d layer %d\n", __FUNCTION__,

          irb->mt, irb->mt_level, irb->mt_layer);

      brw_blorp_exec(brw, ¶ms);

      if (is_fast_clear) {

         /* Now that the fast clear has occurred, put the buffer in

          * INTEL_MCS_STATE_CLEAR so that we won't waste time doing redundant

          * clears.

          */

         irb->mt->mcs_state = INTEL_MCS_STATE_CLEAR;

      }

   }

   return true;

}

void

brw_blorp_resolve_color(struct brw_context *brw, struct intel_mipmap_tree *mt)

{

   DBG("%s to mt %p\n", __FUNCTION__, mt);

   brw_blorp_rt_resolve_params params(brw, mt);

   brw_blorp_exec(brw, ¶ms);

   mt->mcs_state = INTEL_MCS_STATE_RESOLVED;

}

} /* extern "C" */