src/gallium/drivers/swr/swr_clear.cpp

   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"),
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   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  *
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  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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  21  * IN THE SOFTWARE.
  22  ***************************************************************************/
  23
  24 #include "swr_context.h"
  25 #include "swr_query.h"
  26
  27 static void
  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
  97 swr_clear_init(struct pipe_context *pipe)
  98 {
  99    pipe->clear = swr_clear;
 100 }