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1 /****************************************************************************
2  * Copyright (C) 2015 Intel Corporation.   All Rights Reserved.
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 "swr_context.h"
25 #include "swr_query.h"
26 
27 static void
swr_clear(struct pipe_context * pipe,unsigned buffers,const struct pipe_scissor_state * scissor_state,const union pipe_color_union * color,double depth,unsigned stencil)28 swr_clear(struct pipe_context *pipe,
29           unsigned buffers,
30           const struct pipe_scissor_state *scissor_state,
31           const union pipe_color_union *color,
32           double depth,
33           unsigned stencil)
34 {
35    struct swr_context *ctx = swr_context(pipe);
36    struct pipe_framebuffer_state *fb = &ctx->framebuffer;
37 
38    UINT clearMask = 0;
39    unsigned layers = 0;
40 
41    if (!swr_check_render_cond(pipe))
42       return;
43 
44    swr_update_derived(pipe);
45 
46    if (buffers & PIPE_CLEAR_COLOR && fb->nr_cbufs) {
47       for (unsigned i = 0; i < fb->nr_cbufs; ++i)
48          if (fb->cbufs[i] && (buffers & (PIPE_CLEAR_COLOR0 << i))) {
49             clearMask |= (SWR_ATTACHMENT_COLOR0_BIT << i);
50             layers = std::max(layers, fb->cbufs[i]->u.tex.last_layer -
51                                       fb->cbufs[i]->u.tex.first_layer + 1u);
52          }
53    }
54 
55    if (buffers & PIPE_CLEAR_DEPTH && fb->zsbuf) {
56       clearMask |= SWR_ATTACHMENT_DEPTH_BIT;
57       layers = std::max(layers, fb->zsbuf->u.tex.last_layer -
58                                 fb->zsbuf->u.tex.first_layer + 1u);
59    }
60 
61    if (buffers & PIPE_CLEAR_STENCIL && fb->zsbuf) {
62       clearMask |= SWR_ATTACHMENT_STENCIL_BIT;
63       layers = std::max(layers, fb->zsbuf->u.tex.last_layer -
64                                 fb->zsbuf->u.tex.first_layer + 1u);
65    }
66 
67 #if 0 // XXX HACK, override clear color alpha. On ubuntu, clears are
68       // transparent.
69    ((union pipe_color_union *)color)->f[3] = 1.0; /* cast off your const'd-ness */
70 #endif
71 
72    /*
73     * Always clear full surface. When GL_SCISSOR_TEST is enabled
74     * glClear is handled by state tracker and there is no need to do this here
75     */
76    SWR_RECT clear_rect = {0, 0, (int32_t)fb->width, (int32_t)fb->height};
77 
78    for (unsigned i = 0; i < layers; ++i) {
79       swr_update_draw_context(ctx);
80       ctx->api.pfnSwrClearRenderTarget(ctx->swrContext, clearMask, i,
81                                        color->f, depth, stencil,
82                                        clear_rect);
83 
84       // Mask out the attachments that are out of layers.
85       if (fb->zsbuf &&
86           (fb->zsbuf->u.tex.last_layer <= fb->zsbuf->u.tex.first_layer + i))
87          clearMask &= ~(SWR_ATTACHMENT_DEPTH_BIT | SWR_ATTACHMENT_STENCIL_BIT);
88       for (unsigned c = 0; c < fb->nr_cbufs; ++c) {
89          const struct pipe_surface *sf = fb->cbufs[c];
90          if (sf && (sf->u.tex.last_layer <= sf->u.tex.first_layer + i))
91             clearMask &= ~(SWR_ATTACHMENT_COLOR0_BIT << c);
92       }
93    }
94 }
95 
96 void
swr_clear_init(struct pipe_context * pipe)97 swr_clear_init(struct pipe_context *pipe)
98 {
99    pipe->clear = swr_clear;
100 }
101