src/gallium/drivers/i915/i915_clear.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /* Authors:
  29  *    Brian Paul
  30  */
  31
  32
  33 #include "util/u_clear.h"
  34 #include "util/u_format.h"
  35 #include "util/u_pack_color.h"
  36 #include "i915_context.h"
  37 #include "i915_screen.h"
  38 #include "i915_reg.h"
  39 #include "i915_batch.h"
  40 #include "i915_resource.h"
  41 #include "i915_state.h"
  42
  43 void
  44 i915_clear_emit(struct pipe_context *pipe, unsigned buffers,
  45                 const union pipe_color_union *color,
  46                 double depth, unsigned stencil,
  47                 unsigned destx, unsigned desty, unsigned width, unsigned height)
  48 {
  49    struct i915_context *i915 = i915_context(pipe);
  50    uint32_t clear_params, clear_color, clear_depth, clear_stencil,
  51             clear_color8888, packed_z_stencil;
  52    union util_color u_color;
  53    float f_depth = depth;
  54    struct i915_texture *cbuf_tex, *depth_tex;
  55
  56    cbuf_tex = depth_tex = NULL;
  57    clear_params = 0;
  58
  59    if (buffers & PIPE_CLEAR_COLOR) {
  60       struct pipe_surface *cbuf = i915->framebuffer.cbufs[0];
  61
  62       clear_params |= CLEARPARAM_WRITE_COLOR;
  63       cbuf_tex = i915_texture(cbuf->texture);
  64       util_pack_color(color->f, cbuf->format, &u_color);
  65       if (util_format_get_blocksize(cbuf_tex->b.b.format) == 4)
  66          clear_color = u_color.ui;
  67       else
  68          clear_color = (u_color.ui & 0xffff) | (u_color.ui << 16);
  69
  70       util_pack_color(color->f, cbuf->format, &u_color);
  71       clear_color8888 = u_color.ui;
  72    } else
  73       clear_color = clear_color8888 = 0;
  74
  75    clear_depth = clear_stencil = 0;
  76    if (buffers & PIPE_CLEAR_DEPTH) {
  77       struct pipe_surface *zbuf = i915->framebuffer.zsbuf;
  78
  79       clear_params |= CLEARPARAM_WRITE_DEPTH;
  80       depth_tex = i915_texture(zbuf->texture);
  81       packed_z_stencil = util_pack_z_stencil(depth_tex->b.b.format, depth, stencil);
  82
  83       if (util_format_get_blocksize(depth_tex->b.b.format) == 4) {
  84          /* Avoid read-modify-write if there's no stencil. */
  85          if (buffers & PIPE_CLEAR_STENCIL
  86                || depth_tex->b.b.format != PIPE_FORMAT_Z24_UNORM_S8_USCALED) {
  87             clear_params |= CLEARPARAM_WRITE_STENCIL;
  88             clear_stencil = packed_z_stencil & 0xff;
  89             clear_depth = packed_z_stencil;
  90          } else
  91             clear_depth = packed_z_stencil & 0xffffff00;
  92       } else {
  93          clear_depth = (clear_depth & 0xffff) | (clear_depth << 16);
  94       }
  95    }
  96
  97    if (i915->hardware_dirty)
  98       i915_emit_hardware_state(i915);
  99
 100    if (!BEGIN_BATCH(7 + 7)) {
 101       FLUSH_BATCH(NULL);
 102
 103       i915_emit_hardware_state(i915);
 104       i915->vbo_flushed = 1;
 105
 106       assert(BEGIN_BATCH(7 + 7));
 107    }
 108
 109    OUT_BATCH(_3DSTATE_CLEAR_PARAMETERS);
 110    OUT_BATCH(clear_params | CLEARPARAM_CLEAR_RECT);
 111    OUT_BATCH(clear_color);
 112    OUT_BATCH(clear_depth);
 113    OUT_BATCH(clear_color8888);
 114    OUT_BATCH_F(f_depth);
 115    OUT_BATCH(clear_stencil);
 116
 117    OUT_BATCH(_3DPRIMITIVE | PRIM3D_CLEAR_RECT | 5);
 118    OUT_BATCH_F(destx + width);
 119    OUT_BATCH_F(desty + height);
 120    OUT_BATCH_F(destx);
 121    OUT_BATCH_F(desty + height);
 122    OUT_BATCH_F(destx);
 123    OUT_BATCH_F(desty);
 124
 125    /* Flush after clear, its expected to be a costly operation.
 126     * This is not required, just a heuristic
 127     */
 128    FLUSH_BATCH(NULL);
 129
 130    i915->last_fired_vertices = i915->fired_vertices;
 131    i915->fired_vertices = 0;
 132 }
 133
 134 /**
 135  * Clear the given buffers to the specified values.
 136  * No masking, no scissor (clear entire buffer).
 137  */
 138 void
 139 i915_clear_blitter(struct pipe_context *pipe, unsigned buffers,
 140                    const union pipe_color_union *color,
 141                    double depth, unsigned stencil)
 142 {
 143    util_clear(pipe, &i915_context(pipe)->framebuffer, buffers, color, depth,
 144               stencil);
 145 }
 146
 147 void
 148 i915_clear_render(struct pipe_context *pipe, unsigned buffers,
 149                   const union pipe_color_union *color,
 150                   double depth, unsigned stencil)
 151 {
 152    struct i915_context *i915 = i915_context(pipe);
 153
 154    if (i915->dirty)
 155       i915_update_derived(i915);
 156
 157    i915_clear_emit(pipe, buffers, color, depth, stencil,
 158                    0, 0, i915->framebuffer.width, i915->framebuffer.height);
 159 }