Implemented support for software-based AUX color buffers.

Only available with Xlib driver for now.
Assorted clean-ups related to Draw/ReadBuffer().
Renamed FRONT_LEFT_BIT -> DD_FRONT_LEFT_BIT, etc.

5 files changed, 34 insertions, 11 deletions

diff --git a/src/mesa/drivers/x11/fakeglx.c b/src/mesa/drivers/x11/fakeglx.c
index 4535f8cae00..47882114cfc 100644
--- a/src/mesa/drivers/x11/fakeglx.c
+++ b/src/mesa/drivers/x11/fakeglx.c
@@ -252,7 +252,7 @@ save_glx_visual( Display *dpy, XVisualInfo *vinfo,
                  GLint depth_size, GLint stencil_size,
                  GLint accumRedSize, GLint accumGreenSize,
                  GLint accumBlueSize, GLint accumAlphaSize,
-                 GLint level )
+                 GLint level, GLint numAuxBuffers )
 {
    GLboolean ximageFlag = GL_TRUE;
    XMesaVisual xmvis;
@@ -287,6 +287,7 @@ save_glx_visual( Display *dpy, XVisualInfo *vinfo,
       XMesaVisual v = VisualTable[i];
       if (v->display == dpy
           && v->mesa_visual.level == level
+          && v->mesa_visual.numAuxBuffers == numAuxBuffers
           && v->ximage_flag == ximageFlag
           && v->mesa_visual.rgbMode == rgbFlag
           && v->mesa_visual.doubleBufferMode == dbFlag
@@ -327,6 +328,8 @@ save_glx_visual( Display *dpy, XVisualInfo *vinfo,
       /* add xmvis to the list */
       VisualTable[NumVisuals] = xmvis;
       NumVisuals++;
+      /* XXX minor hack */
+      xmvis->mesa_visual.numAuxBuffers = numAuxBuffers;
    }
    return xmvis;
 }
@@ -357,7 +360,8 @@ create_glx_visual( Display *dpy, XVisualInfo *visinfo )
                               0,         /* depth bits */
                               0,         /* stencil bits */
                               0,0,0,0,   /* accum bits */
-                              vislevel   /* level */
+                              vislevel,  /* level */
+                              0          /* numAux */
                             );
    }
    else if (is_usable_visual( visinfo )) {
@@ -374,7 +378,8 @@ create_glx_visual( Display *dpy, XVisualInfo *visinfo )
                                  0 * sizeof(GLaccum), /* g */
                                  0 * sizeof(GLaccum), /* b */
                                  0 * sizeof(GLaccum), /* a */
-                                 0          /* level */
+                                 0,         /* level */
+                                 0          /* numAux */
                                );
       }
       else {
@@ -392,7 +397,8 @@ create_glx_visual( Display *dpy, XVisualInfo *visinfo )
                                  8 * sizeof(GLaccum), /* g */
                                  8 * sizeof(GLaccum), /* b */
                                  8 * sizeof(GLaccum), /* a */
-                                 0          /* level */
+                                 0,         /* level */
+                                 0          /* numAux */
                                );
       }
    }
@@ -925,6 +931,7 @@ static XMesaVisual choose_visual( Display *dpy, int screen, const int *list,
    GLint caveat = DONT_CARE;
    XMesaVisual xmvis = NULL;
    int desiredVisualID = -1;
+   int numAux = 0;
 
    parselist = list;
 
@@ -957,7 +964,9 @@ static XMesaVisual choose_visual( Display *dpy, int screen, const int *list,
 	 case GLX_AUX_BUFFERS:
 	    /* ignore */
 	    parselist++;
-	    parselist++;
+            numAux = *parselist++;
+            if (numAux > MAX_AUX_BUFFERS)
+               return NULL;
 	    break;
 	 case GLX_RED_SIZE:
 	    parselist++;
@@ -1186,7 +1195,7 @@ static XMesaVisual choose_visual( Display *dpy, int screen, const int *list,
       xmvis = save_glx_visual( dpy, vis, rgb_flag, alpha_flag, double_flag,
                                stereo_flag, depth_size, stencil_size,
                                accumRedSize, accumGreenSize,
-                               accumBlueSize, accumAlphaSize, level );
+                               accumBlueSize, accumAlphaSize, level, numAux );
    }
 
    return xmvis;
@@ -1566,7 +1575,7 @@ get_config( XMesaVisual xmvis, int attrib, int *value, GLboolean fbconfig )
 	 *value = (int) xmvis->mesa_visual.stereoMode;
 	 return 0;
       case GLX_AUX_BUFFERS:
-	 *value = (int) False;
+	 *value = xmvis->mesa_visual.numAuxBuffers;
 	 return 0;
       case GLX_RED_SIZE:
          *value = xmvis->mesa_visual.redBits;
diff --git a/src/mesa/drivers/x11/xm_api.c b/src/mesa/drivers/x11/xm_api.c
index 189fde636e8..da2371eb7cc 100644
--- a/src/mesa/drivers/x11/xm_api.c
+++ b/src/mesa/drivers/x11/xm_api.c
@@ -1602,6 +1602,7 @@ XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
                             accum_blue_size, accum_alpha_size,
                             0 );
 
+   /* XXX minor hack */
    v->mesa_visual.level = level;
    return v;
 }
@@ -1789,6 +1790,8 @@ XMesaBuffer XMesaCreateWindowBuffer2( XMesaVisual v, XMesaWindow w,
                                 v->mesa_visual.stencilBits > 0,
                                 v->mesa_visual.accumRedBits > 0,
                                 v->mesa_visual.alphaBits > 0 );
+   /* XXX hack */
+   b->mesa_buffer.UseSoftwareAuxBuffers = GL_TRUE;
 
    if (!initialize_visual_and_buffer( client, v, b, v->mesa_visual.rgbMode,
                                       (XMesaDrawable)w, b->cmap )) {
diff --git a/src/mesa/drivers/x11/xm_dd.c b/src/mesa/drivers/x11/xm_dd.c
index 1178b71b74f..b58188e2003 100644
--- a/src/mesa/drivers/x11/xm_dd.c
+++ b/src/mesa/drivers/x11/xm_dd.c
@@ -41,6 +41,7 @@
 #include "xmesaP.h"
 #include "array_cache/acache.h"
 #include "swrast/swrast.h"
+#include "swrast/s_auxbuffer.h"
 #include "swrast/s_context.h"
 #include "swrast/s_drawpix.h"
 #include "swrast/s_alphabuf.h"
@@ -167,10 +168,11 @@ xmesa_set_buffer( GLcontext *ctx, GLframebuffer *buffer, GLuint bufferBit )
    /*
     * Now determine front vs back color buffer.
     */
-   if (bufferBit == FRONT_LEFT_BIT) {
+   if (bufferBit == DD_FRONT_LEFT_BIT) {
       target->buffer = target->frontbuffer;
+      xmesa_update_span_funcs(ctx);
    }
-   else if (bufferBit == BACK_LEFT_BIT) {
+   else if (bufferBit == DD_BACK_LEFT_BIT) {
       ASSERT(target->db_state);
       if (target->backpixmap) {
          /* back buffer is a pixmap */
@@ -184,12 +186,15 @@ xmesa_set_buffer( GLcontext *ctx, GLframebuffer *buffer, GLuint bufferBit )
          /* No back buffer!!!!  Must be out of memory, use front buffer */
          target->buffer = target->frontbuffer;
       }
+      xmesa_update_span_funcs(ctx);
    }
+   else if (bufferBit & (DD_AUX0_BIT | DD_AUX1_BIT | DD_AUX2_BIT | DD_AUX3_BIT)) {
+      _swrast_use_aux_buffer(ctx, buffer, bufferBit);
+   } 
    else {
       _mesa_problem(ctx, "invalid buffer 0x%x in set_buffer() in xm_dd.c");
       return;
    }
-   xmesa_update_span_funcs(ctx);
 }
 
 
@@ -1105,7 +1110,9 @@ void xmesa_update_state( GLcontext *ctx, GLuint new_state )
       break;
    }
 
-   xmesa_update_span_funcs(ctx);
+   if (ctx->Color._DrawDestMask & (DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT)) {
+      xmesa_update_span_funcs(ctx);
+   }
 }
 
 
diff --git a/src/mesa/drivers/x11/xm_line.c b/src/mesa/drivers/x11/xm_line.c
index 342528dbefa..a5352d61474 100644
--- a/src/mesa/drivers/x11/xm_line.c
+++ b/src/mesa/drivers/x11/xm_line.c
@@ -492,6 +492,8 @@ static swrast_line_func get_line_func( GLcontext *ctx )
    SWcontext *swrast = SWRAST_CONTEXT(ctx);
    int depth = GET_VISUAL_DEPTH(xmesa->xm_visual);
 
+   if ((ctx->Color._DrawDestMask & (DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT)) ==0)
+      return (swrast_line_func) NULL;
    if (ctx->RenderMode != GL_RENDER)      return (swrast_line_func) NULL;
    if (ctx->Line.SmoothFlag)              return (swrast_line_func) NULL;
    if (ctx->Texture._EnabledUnits)        return (swrast_line_func) NULL;
diff --git a/src/mesa/drivers/x11/xm_tri.c b/src/mesa/drivers/x11/xm_tri.c
index 868bca4937f..f018a6acacb 100644
--- a/src/mesa/drivers/x11/xm_tri.c
+++ b/src/mesa/drivers/x11/xm_tri.c
@@ -1313,6 +1313,8 @@ static swrast_tri_func get_triangle_func( GLcontext *ctx )
    triFuncName = NULL;
 #endif
 
+   if ((ctx->Color._DrawDestMask & (DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT)) ==0)
+      return (swrast_tri_func) NULL;
    if (ctx->RenderMode != GL_RENDER)  return (swrast_tri_func) NULL;
    if (ctx->Polygon.SmoothFlag)       return (swrast_tri_func) NULL;
    if (ctx->Texture._EnabledUnits)    return (swrast_tri_func) NULL;