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      1 /*
      2  * Copyright 2006 VMware, Inc.
      3  * All Rights Reserved.
      4  *
      5  * Permission is hereby granted, free of charge, to any person obtaining a
      6  * copy of this software and associated documentation files (the
      7  * "Software"), to deal in the Software without restriction, including
      8  * without limitation the rights to use, copy, modify, merge, publish,
      9  * distribute, sublicense, and/or sell copies of the Software, and to
     10  * permit persons to whom the Software is furnished to do so, subject to
     11  * the following conditions:
     12  *
     13  * The above copyright notice and this permission notice (including the
     14  * next paragraph) shall be included in all copies or substantial portionsalloc
     15  * of the Software.
     16  *
     17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
     20  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
     21  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
     22  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
     23  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     24  */
     25 
     26 #include "main/accum.h"
     27 #include "main/enums.h"
     28 #include "main/state.h"
     29 #include "main/bufferobj.h"
     30 #include "main/context.h"
     31 #include "swrast/swrast.h"
     32 
     33 #include "brw_context.h"
     34 #include "intel_pixel.h"
     35 
     36 #define FILE_DEBUG_FLAG DEBUG_PIXEL
     37 
     38 static GLenum
     39 effective_func(GLenum func, bool src_alpha_is_one)
     40 {
     41    if (src_alpha_is_one) {
     42       if (func == GL_SRC_ALPHA)
     43 	 return GL_ONE;
     44       if (func == GL_ONE_MINUS_SRC_ALPHA)
     45 	 return GL_ZERO;
     46    }
     47 
     48    return func;
     49 }
     50 
     51 /**
     52  * Check if any fragment operations are in effect which might effect
     53  * glDraw/CopyPixels.
     54  */
     55 bool
     56 intel_check_blit_fragment_ops(struct gl_context * ctx, bool src_alpha_is_one)
     57 {
     58    if (ctx->NewState)
     59       _mesa_update_state(ctx);
     60 
     61    if (ctx->FragmentProgram._Enabled) {
     62       DBG("fallback due to fragment program\n");
     63       return false;
     64    }
     65 
     66    if (ctx->Color.BlendEnabled &&
     67        (effective_func(ctx->Color.Blend[0].SrcRGB, src_alpha_is_one) != GL_ONE ||
     68 	effective_func(ctx->Color.Blend[0].DstRGB, src_alpha_is_one) != GL_ZERO ||
     69 	ctx->Color.Blend[0].EquationRGB != GL_FUNC_ADD ||
     70 	effective_func(ctx->Color.Blend[0].SrcA, src_alpha_is_one) != GL_ONE ||
     71 	effective_func(ctx->Color.Blend[0].DstA, src_alpha_is_one) != GL_ZERO ||
     72 	ctx->Color.Blend[0].EquationA != GL_FUNC_ADD)) {
     73       DBG("fallback due to blend\n");
     74       return false;
     75    }
     76 
     77    if (ctx->Texture._MaxEnabledTexImageUnit != -1) {
     78       DBG("fallback due to texturing\n");
     79       return false;
     80    }
     81 
     82    if (!(ctx->Color.ColorMask[0][0] &&
     83 	 ctx->Color.ColorMask[0][1] &&
     84 	 ctx->Color.ColorMask[0][2] &&
     85 	 ctx->Color.ColorMask[0][3])) {
     86       DBG("fallback due to color masking\n");
     87       return false;
     88    }
     89 
     90    if (ctx->Color.AlphaEnabled) {
     91       DBG("fallback due to alpha\n");
     92       return false;
     93    }
     94 
     95    if (ctx->Depth.Test) {
     96       DBG("fallback due to depth test\n");
     97       return false;
     98    }
     99 
    100    if (ctx->Fog.Enabled) {
    101       DBG("fallback due to fog\n");
    102       return false;
    103    }
    104 
    105    if (ctx->_ImageTransferState) {
    106       DBG("fallback due to image transfer\n");
    107       return false;
    108    }
    109 
    110    if (ctx->Stencil._Enabled) {
    111       DBG("fallback due to image stencil\n");
    112       return false;
    113    }
    114 
    115    if (ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F) {
    116       DBG("fallback due to pixel zoom\n");
    117       return false;
    118    }
    119 
    120    if (ctx->RenderMode != GL_RENDER) {
    121       DBG("fallback due to render mode\n");
    122       return false;
    123    }
    124 
    125    return true;
    126 }
    127 
    128 void
    129 intelInitPixelFuncs(struct dd_function_table *functions)
    130 {
    131    functions->Bitmap = intelBitmap;
    132    functions->CopyPixels = intelCopyPixels;
    133    functions->DrawPixels = intelDrawPixels;
    134    functions->ReadPixels = intelReadPixels;
    135 }
    136 
    137