src/gallium/drivers/swr/swr_clear.cpp

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