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      1 /**************************************************************************
      2  *
      3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
      4  * Copyright 2009 Intel Corporation.
      5  * All Rights Reserved.
      6  *
      7  * Permission is hereby granted, free of charge, to any person obtaining a
      8  * copy of this software and associated documentation files (the
      9  * "Software"), to deal in the Software without restriction, including
     10  * without limitation the rights to use, copy, modify, merge, publish,
     11  * distribute, sub license, and/or sell copies of the Software, and to
     12  * permit persons to whom the Software is furnished to do so, subject to
     13  * the following conditions:
     14  *
     15  * The above copyright notice and this permission notice (including the
     16  * next paragraph) shall be included in all copies or substantial portions
     17  * of the Software.
     18  *
     19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
     22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
     23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
     24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
     25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     26  *
     27  **************************************************************************/
     28 
     29 #include "main/glheader.h"
     30 #include "main/mtypes.h"
     31 #include "main/condrender.h"
     32 #include "swrast/swrast.h"
     33 #include "drivers/common/meta.h"
     34 
     35 #include "intel_context.h"
     36 #include "intel_blit.h"
     37 #include "intel_clear.h"
     38 #include "intel_fbo.h"
     39 #include "intel_regions.h"
     40 
     41 #define FILE_DEBUG_FLAG DEBUG_BLIT
     42 
     43 static const char *buffer_names[] = {
     44    [BUFFER_FRONT_LEFT] = "front",
     45    [BUFFER_BACK_LEFT] = "back",
     46    [BUFFER_FRONT_RIGHT] = "front right",
     47    [BUFFER_BACK_RIGHT] = "back right",
     48    [BUFFER_DEPTH] = "depth",
     49    [BUFFER_STENCIL] = "stencil",
     50    [BUFFER_ACCUM] = "accum",
     51    [BUFFER_AUX0] = "aux0",
     52    [BUFFER_COLOR0] = "color0",
     53    [BUFFER_COLOR1] = "color1",
     54    [BUFFER_COLOR2] = "color2",
     55    [BUFFER_COLOR3] = "color3",
     56    [BUFFER_COLOR4] = "color4",
     57    [BUFFER_COLOR5] = "color5",
     58    [BUFFER_COLOR6] = "color6",
     59    [BUFFER_COLOR7] = "color7",
     60 };
     61 
     62 static void
     63 debug_mask(const char *name, GLbitfield mask)
     64 {
     65    GLuint i;
     66 
     67    if (unlikely(INTEL_DEBUG & DEBUG_BLIT)) {
     68       DBG("%s clear:", name);
     69       for (i = 0; i < BUFFER_COUNT; i++) {
     70 	 if (mask & (1 << i))
     71 	    DBG(" %s", buffer_names[i]);
     72       }
     73       DBG("\n");
     74    }
     75 }
     76 
     77 /**
     78  * Called by ctx->Driver.Clear.
     79  */
     80 static void
     81 intelClear(struct gl_context *ctx, GLbitfield mask)
     82 {
     83    struct intel_context *intel = intel_context(ctx);
     84    const GLuint colorMask = *((GLuint *) & ctx->Color.ColorMask[0]);
     85    GLbitfield tri_mask = 0;
     86    GLbitfield blit_mask = 0;
     87    GLbitfield swrast_mask = 0;
     88    struct gl_framebuffer *fb = ctx->DrawBuffer;
     89    struct intel_renderbuffer *irb;
     90    int i;
     91 
     92    if (mask & (BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_FRONT_RIGHT)) {
     93       intel->front_buffer_dirty = true;
     94    }
     95 
     96    if (0)
     97       fprintf(stderr, "%s\n", __FUNCTION__);
     98 
     99    /* Get SW clears out of the way: Anything without an intel_renderbuffer */
    100    for (i = 0; i < BUFFER_COUNT; i++) {
    101       if (!(mask & (1 << i)))
    102 	 continue;
    103 
    104       irb = intel_get_renderbuffer(fb, i);
    105       if (unlikely(!irb)) {
    106 	 swrast_mask |= (1 << i);
    107 	 mask &= ~(1 << i);
    108       }
    109    }
    110    if (unlikely(swrast_mask)) {
    111       debug_mask("swrast", swrast_mask);
    112       _swrast_Clear(ctx, swrast_mask);
    113    }
    114 
    115    /* HW color buffers (front, back, aux, generic FBO, etc) */
    116    if (colorMask == ~0) {
    117       /* clear all R,G,B,A */
    118       blit_mask |= (mask & BUFFER_BITS_COLOR);
    119    }
    120    else {
    121       /* glColorMask in effect */
    122       tri_mask |= (mask & BUFFER_BITS_COLOR);
    123    }
    124 
    125    /* Make sure we have up to date buffers before we start looking at
    126     * the tiling bits to determine how to clear. */
    127    intel_prepare_render(intel);
    128 
    129    /* HW stencil */
    130    if (mask & BUFFER_BIT_STENCIL) {
    131       const struct intel_region *stencilRegion
    132          = intel_get_rb_region(fb, BUFFER_STENCIL);
    133       if (stencilRegion) {
    134          /* have hw stencil */
    135          if (stencilRegion->tiling == I915_TILING_Y ||
    136 	     (ctx->Stencil.WriteMask[0] & 0xff) != 0xff) {
    137 	    /* We have to use the 3D engine if we're clearing a partial mask
    138 	     * of the stencil buffer, or if we're on a 965 which has a tiled
    139 	     * depth/stencil buffer in a layout we can't blit to.
    140 	     */
    141             tri_mask |= BUFFER_BIT_STENCIL;
    142          }
    143          else {
    144             /* clearing all stencil bits, use blitting */
    145             blit_mask |= BUFFER_BIT_STENCIL;
    146          }
    147       }
    148    }
    149 
    150    /* HW depth */
    151    if (mask & BUFFER_BIT_DEPTH) {
    152       const struct intel_region *irb = intel_get_rb_region(fb, BUFFER_DEPTH);
    153 
    154       /* clear depth with whatever method is used for stencil (see above) */
    155       if (irb->tiling == I915_TILING_Y || tri_mask & BUFFER_BIT_STENCIL)
    156          tri_mask |= BUFFER_BIT_DEPTH;
    157       else
    158          blit_mask |= BUFFER_BIT_DEPTH;
    159    }
    160 
    161    /* If we're doing a tri pass for depth/stencil, include a likely color
    162     * buffer with it.
    163     */
    164    if (mask & (BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL)) {
    165       int color_bit = ffs(mask & BUFFER_BITS_COLOR);
    166       if (color_bit != 0) {
    167 	 tri_mask |= blit_mask & (1 << (color_bit - 1));
    168 	 blit_mask &= ~(1 << (color_bit - 1));
    169       }
    170    }
    171 
    172    /* Anything left, just use tris */
    173    tri_mask |= mask & ~blit_mask;
    174 
    175    if (blit_mask) {
    176       debug_mask("blit", blit_mask);
    177       tri_mask |= intelClearWithBlit(ctx, blit_mask);
    178    }
    179 
    180    if (tri_mask) {
    181       debug_mask("tri", tri_mask);
    182       if (ctx->API == API_OPENGLES)
    183 	 _mesa_meta_Clear(&intel->ctx, tri_mask);
    184       else
    185 	 _mesa_meta_glsl_Clear(&intel->ctx, tri_mask);
    186    }
    187 }
    188 
    189 
    190 void
    191 intelInitClearFuncs(struct dd_function_table *functions)
    192 {
    193    functions->Clear = intelClear;
    194 }
    195