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      1 /*
      2  * Copyright  2012 Intel Corporation
      3  *
      4  * Permission is hereby granted, free of charge, to any person obtaining a
      5  * copy of this software and associated documentation files (the "Software"),
      6  * to deal in the Software without restriction, including without limitation
      7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8  * and/or sell copies of the Software, and to permit persons to whom the
      9  * Software is furnished to do so, subject to the following conditions:
     10  *
     11  * The above copyright notice and this permission notice (including the next
     12  * paragraph) shall be included in all copies or substantial portions of the
     13  * Software.
     14  *
     15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
     21  * IN THE SOFTWARE.
     22  */
     23 
     24 #include "main/blend.h"
     25 #include "main/mtypes.h"
     26 #include "main/samplerobj.h"
     27 #include "main/texformat.h"
     28 #include "main/teximage.h"
     29 #include "program/prog_parameter.h"
     30 #include "program/prog_instruction.h"
     31 
     32 #include "intel_mipmap_tree.h"
     33 #include "intel_batchbuffer.h"
     34 #include "intel_tex.h"
     35 #include "intel_fbo.h"
     36 #include "intel_buffer_objects.h"
     37 #include "intel_image.h"
     38 
     39 #include "brw_context.h"
     40 #include "brw_state.h"
     41 #include "brw_defines.h"
     42 #include "brw_wm.h"
     43 #include "isl/isl.h"
     44 
     45 static uint32_t *
     46 gen8_allocate_surface_state(struct brw_context *brw,
     47                             uint32_t *out_offset, int index)
     48 {
     49    uint32_t *surf = __brw_state_batch(brw, AUB_TRACE_SURFACE_STATE,
     50                                       64, 64, index, out_offset);
     51    memset(surf, 0, 64);
     52    return surf;
     53 }
     54 
     55 /**
     56  * Creates a null surface.
     57  *
     58  * This is used when the shader doesn't write to any color output.  An FB
     59  * write to target 0 will still be emitted, because that's how the thread is
     60  * terminated (and computed depth is returned), so we need to have the
     61  * hardware discard the target 0 color output..
     62  */
     63 static void
     64 gen8_emit_null_surface_state(struct brw_context *brw,
     65                              unsigned width,
     66                              unsigned height,
     67                              unsigned samples,
     68                              uint32_t *out_offset)
     69 {
     70    uint32_t *surf = gen8_allocate_surface_state(brw, out_offset, -1);
     71 
     72    surf[0] = BRW_SURFACE_NULL << BRW_SURFACE_TYPE_SHIFT |
     73              BRW_SURFACEFORMAT_B8G8R8A8_UNORM << BRW_SURFACE_FORMAT_SHIFT |
     74              GEN8_SURFACE_TILING_Y;
     75    surf[2] = SET_FIELD(width - 1, GEN7_SURFACE_WIDTH) |
     76              SET_FIELD(height - 1, GEN7_SURFACE_HEIGHT);
     77 }
     78 
     79 void
     80 gen8_init_vtable_surface_functions(struct brw_context *brw)
     81 {
     82    brw->vtbl.update_renderbuffer_surface = brw_update_renderbuffer_surface;
     83    brw->vtbl.emit_null_surface_state = gen8_emit_null_surface_state;
     84 }
     85