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