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    int depth_clear_bbp, color_clear_bbp;
  56
  57    cbuf_tex = depth_tex = NULL;
  58    clear_params = 0;
  59    depth_clear_bbp = color_clear_bbp = 0;
  60
  61    if (buffers & PIPE_CLEAR_COLOR) {
  62       struct pipe_surface *cbuf = i915->framebuffer.cbufs[0];
  63
  64       clear_params |= CLEARPARAM_WRITE_COLOR;
  65       cbuf_tex = i915_texture(cbuf->texture);
  66
  67       util_pack_color(color->f, cbuf->format, &u_color);
  68       if (util_format_get_blocksize(cbuf_tex->b.b.format) == 4) {
  69          clear_color = u_color.ui;
  70          color_clear_bbp = 32;
  71       } else {
  72          clear_color = (u_color.ui & 0xffff) | (u_color.ui << 16);
  73          color_clear_bbp = 16;
  74       }
  75
  76       /* correctly swizzle clear value */
  77       if (i915->current.need_target_fixup)
  78          util_pack_color(color->f, cbuf->format, &u_color);
  79       else
  80          util_pack_color(color->f, PIPE_FORMAT_B8G8R8A8_UNORM, &u_color);
  81       clear_color8888 = u_color.ui;
  82    } else
  83       clear_color = clear_color8888 = 0;
  84
  85    clear_depth = clear_stencil = 0;
  86    if (buffers & PIPE_CLEAR_DEPTH) {
  87       struct pipe_surface *zbuf = i915->framebuffer.zsbuf;
  88
  89       clear_params |= CLEARPARAM_WRITE_DEPTH;
  90       depth_tex = i915_texture(zbuf->texture);
  91       packed_z_stencil = util_pack_z_stencil(depth_tex->b.b.format, depth, stencil);
  92
  93       if (util_format_get_blocksize(depth_tex->b.b.format) == 4) {
  94          /* Avoid read-modify-write if there's no stencil. */
  95          if (buffers & PIPE_CLEAR_STENCIL
  96                || depth_tex->b.b.format != PIPE_FORMAT_Z24_UNORM_S8_USCALED) {
  97             clear_params |= CLEARPARAM_WRITE_STENCIL;
  98             clear_stencil = packed_z_stencil & 0xff;
  99             clear_depth = packed_z_stencil;
 100          } else
 101             clear_depth = packed_z_stencil & 0xffffff00;
 102
 103          depth_clear_bbp = 32;
 104       } else {
 105          clear_depth = (packed_z_stencil & 0xffff) | (packed_z_stencil << 16);
 106          depth_clear_bbp = 16;
 107       }
 108    } else if (buffers & PIPE_CLEAR_DEPTH) {
 109       struct pipe_surface *zbuf = i915->framebuffer.zsbuf;
 110
 111       clear_params |= CLEARPARAM_WRITE_STENCIL;
 112       depth_tex = i915_texture(zbuf->texture);
 113       assert(depth_tex->b.b.format == PIPE_FORMAT_Z24_UNORM_S8_USCALED);
 114
 115       packed_z_stencil = util_pack_z_stencil(depth_tex->b.b.format, depth, stencil);
 116       depth_clear_bbp = 32;
 117       clear_stencil = packed_z_stencil & 0xff;
 118    }
 119
 120    /* hw can't fastclear both depth and color if their bbp mismatch. */
 121    if (color_clear_bbp && depth_clear_bbp
 122          && color_clear_bbp != depth_clear_bbp) {
 123       if (i915->hardware_dirty)
 124          i915_emit_hardware_state(i915);
 125
 126       if (!BEGIN_BATCH(1 + 2*(7 + 7))) {
 127          FLUSH_BATCH(NULL);
 128
 129          i915_emit_hardware_state(i915);
 130          i915->vbo_flushed = 1;
 131
 132          assert(BEGIN_BATCH(1 + 2*(7 + 7)));
 133       }
 134
 135       OUT_BATCH(_3DSTATE_SCISSOR_ENABLE_CMD | DISABLE_SCISSOR_RECT);
 136
 137       OUT_BATCH(_3DSTATE_CLEAR_PARAMETERS);
 138       OUT_BATCH(CLEARPARAM_WRITE_COLOR | CLEARPARAM_CLEAR_RECT);
 139       /* Used for zone init prim */
 140       OUT_BATCH(clear_color);
 141       OUT_BATCH(clear_depth);
 142       /* Used for clear rect prim */
 143       OUT_BATCH(clear_color8888);
 144       OUT_BATCH_F(f_depth);
 145       OUT_BATCH(clear_stencil);
 146
 147       OUT_BATCH(_3DPRIMITIVE | PRIM3D_CLEAR_RECT | 5);
 148       OUT_BATCH_F(destx + width);
 149       OUT_BATCH_F(desty + height);
 150       OUT_BATCH_F(destx);
 151       OUT_BATCH_F(desty + height);
 152       OUT_BATCH_F(destx);
 153       OUT_BATCH_F(desty);
 154
 155       OUT_BATCH(_3DSTATE_CLEAR_PARAMETERS);
 156       OUT_BATCH((clear_params & ~CLEARPARAM_WRITE_COLOR) |
 157                 CLEARPARAM_CLEAR_RECT);
 158       /* Used for zone init prim */
 159       /* Used for zone init prim */
 160       OUT_BATCH(clear_color);
 161       OUT_BATCH(clear_depth);
 162       /* Used for clear rect prim */
 163       OUT_BATCH(clear_color8888);
 164       OUT_BATCH_F(f_depth);
 165       OUT_BATCH(clear_stencil);
 166
 167       OUT_BATCH(_3DPRIMITIVE | PRIM3D_CLEAR_RECT | 5);
 168       OUT_BATCH_F(destx + width);
 169       OUT_BATCH_F(desty + height);
 170       OUT_BATCH_F(destx);
 171       OUT_BATCH_F(desty + height);
 172       OUT_BATCH_F(destx);
 173       OUT_BATCH_F(desty);
 174    } else {
 175       if (i915->hardware_dirty)
 176          i915_emit_hardware_state(i915);
 177
 178       if (!BEGIN_BATCH(1 + 7 + 7)) {
 179          FLUSH_BATCH(NULL);
 180
 181          i915_emit_hardware_state(i915);
 182          i915->vbo_flushed = 1;
 183
 184          assert(BEGIN_BATCH(1 + 7 + 7));
 185       }
 186
 187       OUT_BATCH(_3DSTATE_SCISSOR_ENABLE_CMD | DISABLE_SCISSOR_RECT);
 188
 189       OUT_BATCH(_3DSTATE_CLEAR_PARAMETERS);
 190       OUT_BATCH(clear_params | CLEARPARAM_CLEAR_RECT);
 191       /* Used for zone init prim */
 192       OUT_BATCH(clear_color);
 193       OUT_BATCH(clear_depth);
 194       /* Used for clear rect prim */
 195       OUT_BATCH(clear_color8888);
 196       OUT_BATCH_F(f_depth);
 197       OUT_BATCH(clear_stencil);
 198
 199       OUT_BATCH(_3DPRIMITIVE | PRIM3D_CLEAR_RECT | 5);
 200       OUT_BATCH_F(destx + width);
 201       OUT_BATCH_F(desty + height);
 202       OUT_BATCH_F(destx);
 203       OUT_BATCH_F(desty + height);
 204       OUT_BATCH_F(destx);
 205       OUT_BATCH_F(desty);
 206    }
 207
 208    /* Flush after clear, its expected to be a costly operation.
 209     * This is not required, just a heuristic, but without the flush we'd need to
 210     * clobber the SCISSOR_ENABLE dynamic state. */
 211    FLUSH_BATCH(NULL);
 212
 213    i915->last_fired_vertices = i915->fired_vertices;
 214    i915->fired_vertices = 0;
 215 }
 216
 217 /**
 218  * Clear the given buffers to the specified values.
 219  * No masking, no scissor (clear entire buffer).
 220  */
 221 void
 222 i915_clear_blitter(struct pipe_context *pipe, unsigned buffers,
 223                    const union pipe_color_union *color,
 224                    double depth, unsigned stencil)
 225 {
 226    util_clear(pipe, &i915_context(pipe)->framebuffer, buffers, color, depth,
 227               stencil);
 228 }
 229
 230 void
 231 i915_clear_render(struct pipe_context *pipe, unsigned buffers,
 232                   const union pipe_color_union *color,
 233                   double depth, unsigned stencil)
 234 {
 235    struct i915_context *i915 = i915_context(pipe);
 236
 237    if (i915->dirty)
 238       i915_update_derived(i915);
 239
 240    i915_clear_emit(pipe, buffers, color, depth, stencil,
 241                    0, 0, i915->framebuffer.width, i915->framebuffer.height);
 242 }