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POOpening Macro definitions: tdfx_span.c: lvalue required as left operand of assignment
 

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  1. POOpening Macro definitions: tdfx_span.c: lvalue required as left operand of assignment
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    <p>I'm trying to compile X11R6-7.0 under Ubuntu maverick and got some weird compilation errors I'm unable to resolve myself.</p> <p>I needed X11R6-7.0 as ati catalyst drivers don't support newer xorg and oss drivers don't support 3d acceleration of my hardware.</p> <p>Anyone know what this error message means? I know some <strong>C</strong> but I got a bit confused. Does it mean <code>GET_FB_DATA</code> macro returned <code>NULL</code> or some method/property not set?</p> <p>Any further insight how to "debug" preprocessor definitions at this point would be great. I don't think I can print anything useful with <code>#error</code>.</p> <p>The error I get:</p> <blockquote> <p>tdfx_span.c: In function ‘tdfxDDWriteDepthPixels’:<br> tdfx_span.c:976: error: lvalue required as left operand of assignment<br> tdfx_span.c:1008: error: lvalue required as left operand of assignment<br> tdfx_span.c: In function ‘write_stencil_pixels’:<br> tdfx_span.c:1242: error: lvalue required as left operand of assignment </p> </blockquote> <p>the Code:</p> <pre><code>958- switch (depth_size) { 959- case 16: 960- GetBackBufferInfo(fxMesa, &amp;backBufferInfo); 961- /* 962- * Note that the _LOCK macro adds a curly brace, 963- * and the UNLOCK macro removes it. 964- */ 965- WRITE_FB_SPAN_LOCK(fxMesa, info, 966- GR_BUFFER_AUXBUFFER, GR_LFBWRITEMODE_ANY); 967- { 968- LFBParameters ReadParams; 969- GetFbParams(fxMesa, &amp;info, &amp;backBufferInfo, 970- &amp;ReadParams, sizeof(GLushort)); 971- for (i = 0; i &lt; n; i++) { 972- if (mask[i] &amp;&amp; visible_pixel(fxMesa, x[i], y[i])) { 973- xpos = x[i] + fxMesa-&gt;x_offset; 974- ypos = bottom - y[i]; 975- d16 = depth[i]; 976: PUT_FB_DATA(&amp;ReadParams, GLushort, xpos, ypos, d16); 977- } 978- } 979- } 980- WRITE_FB_SPAN_UNLOCK(fxMesa, GR_BUFFER_AUXBUFFER); 981- break; 982- case 24: </code></pre> <p>And relative macros:</p> <pre><code>#define GET_FB_DATA(ReadParamsp, type, x, y) \ (((x) &lt; (ReadParamsp)-&gt;firstWrappedX) \ ? (((type *)((ReadParamsp)-&gt;lfbPtr)) \ [(y) * ((ReadParamsp)-&gt;LFBStrideInElts) \ + (x)]) \ : (((type *)((ReadParamsp)-&gt;lfbWrapPtr)) \ [((y)) * ((ReadParamsp)-&gt;LFBStrideInElts) \ + ((x) - (ReadParamsp)-&gt;firstWrappedX)])) #define GET_ORDINARY_FB_DATA(ReadParamsp, type, x, y) \ (((type *)((ReadParamsp)-&gt;lfbPtr)) \ [(y) * ((ReadParamsp)-&gt;LFBStrideInElts) \ + (x)]) #define GET_WRAPPED_FB_DATA(ReadParamsp, type, x, y) \ (((type *)((ReadParamsp)-&gt;lfbWrapPtr)) \ [((y)) * ((ReadParamsp)-&gt;LFBStrideInElts) \ + ((x) - (ReadParamsp)-&gt;firstWrappedX)]) #define PUT_FB_DATA(ReadParamsp, type, x, y, value) \ (GET_FB_DATA(ReadParamsp, type, x, y) = (type)(value)) #define PUT_ORDINARY_FB_DATA(ReadParamsp, type, x, y, value) \ (GET_ORDINARY_FB_DATA(ReadParamsp, type, x, y) = (type)(value)) #define PUT_WRAPPED_FB_DATA(ReadParamsp, type, x, y, value) \ (GET_WRAPPED_FB_DATA(ReadParamsp, type, x, y) = (type)(value)) </code></pre> <p>The LFBParameters Struct</p> <pre><code>483-typedef struct 484-{ 485- void *lfbPtr; 486- void *lfbWrapPtr; 487- FxU32 LFBStrideInElts; 488- GLint firstWrappedX; 489-} 490:LFBParameters; </code></pre>
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