LOTS of changes, building upon Klaus's work.

struct sw_span is used throughout span/fragment processing.
This is leading to less code and more chances for optimization.

1 files changed, 88 insertions, 102 deletions

diff --git a/src/mesa/swrast/s_drawpix.c b/src/mesa/swrast/s_drawpix.c
index dfe71668802..4be186bb917 100644
--- a/src/mesa/swrast/s_drawpix.c
+++ b/src/mesa/swrast/s_drawpix.c
@@ -1,4 +1,4 @@
-/* $Id: s_drawpix.c,v 1.25 2002/01/15 21:49:58 brianp Exp $ */
+/* $Id: s_drawpix.c,v 1.26 2002/01/27 18:32:03 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -489,46 +489,37 @@ draw_index_pixels( GLcontext *ctx, GLint x, GLint y,
 {
    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
    const GLint desty = y;
-   GLint row, drawWidth;
-   GLdepth zspan[MAX_WIDTH];
-   GLfloat fogSpan[MAX_WIDTH];
+   GLint row, drawWidth = (width > MAX_WIDTH) ? MAX_WIDTH : width;
+   struct sw_span span;
 
-   drawWidth = (width > MAX_WIDTH) ? MAX_WIDTH : width;
+   INIT_SPAN(span);
+   span.arrayMask |= SPAN_INDEX;
 
-   /* Fragment depth values */
-   if (ctx->Depth.Test || ctx->Fog.Enabled) {
-      GLdepth zval = (GLdepth) (ctx->Current.RasterPos[2] * ctx->DepthMaxF);
-      GLfloat fog;
-      GLint i;
-
-      if (ctx->Fog.FogCoordinateSource == GL_FOG_COORDINATE_EXT)
-         fog = _mesa_z_to_fogfactor(ctx, ctx->Current.RasterFogCoord);
-      else
-         fog = _mesa_z_to_fogfactor(ctx, ctx->Current.RasterDistance);
-
-      for (i = 0; i < drawWidth; i++) {
-	 zspan[i] = zval;
-         fogSpan[i] = fog;
-      }
-   }
+   if (ctx->Depth.Test)
+      _mesa_span_default_z(ctx, &span);
+   if (ctx->Fog.Enabled)
+      _mesa_span_default_fog(ctx, &span);
 
    /*
     * General solution
     */
    for (row = 0; row < height; row++, y++) {
-      GLuint indexes[MAX_WIDTH];
       const GLvoid *source = _mesa_image_address(&ctx->Unpack,
                     pixels, width, height, GL_COLOR_INDEX, type, 0, row, 0);
-      _mesa_unpack_index_span(ctx, drawWidth, GL_UNSIGNED_INT, indexes,
+      _mesa_unpack_index_span(ctx, drawWidth, GL_UNSIGNED_INT,
+                              span.color.index,
                               type, source, &ctx->Unpack,
                               ctx->_ImageTransferState);
       if (zoom) {
-         _mesa_write_zoomed_index_span(ctx, drawWidth, x, y, zspan, fogSpan,
-                                       indexes, desty);
+         _mesa_write_zoomed_index_span(ctx, drawWidth, x, y,
+                                       span.zArray, span.fogArray,
+                                       span.color.index, desty);
       }
       else {
-         _old_write_index_span(ctx, drawWidth, x, y, zspan, fogSpan, indexes,
-                                NULL, GL_BITMAP);
+         span.x = x;
+         span.y = y;
+         span.end = drawWidth;
+         _mesa_write_index_span(ctx, &span, GL_BITMAP);
       }
    }
 }
@@ -594,7 +585,6 @@ draw_stencil_pixels( GLcontext *ctx, GLint x, GLint y,
 }
 
 
-
 /*
  * Do a glDrawPixels of depth values.
  */
@@ -606,9 +596,12 @@ draw_depth_pixels( GLcontext *ctx, GLint x, GLint y,
    const GLboolean bias_or_scale = ctx->Pixel.DepthBias!=0.0 || ctx->Pixel.DepthScale!=1.0;
    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
    const GLint desty = y;
-   GLchan rgba[MAX_WIDTH][4];
-   GLuint ispan[MAX_WIDTH];
    GLint drawWidth = (width > MAX_WIDTH) ? MAX_WIDTH : width;
+   struct sw_span span;
+
+   INIT_SPAN(span);
+   span.arrayMask |= SPAN_Z;
+   span.end = drawWidth;
 
    if (type != GL_BYTE
        && type != GL_UNSIGNED_BYTE
@@ -621,42 +614,28 @@ draw_depth_pixels( GLcontext *ctx, GLint x, GLint y,
       return;
    }
 
-   /* Colors or indexes */
-   if (ctx->Visual.rgbMode) {
-      GLint i;
-      GLint r, g, b, a;
-      UNCLAMPED_FLOAT_TO_CHAN(r, ctx->Current.RasterColor[0]);
-      UNCLAMPED_FLOAT_TO_CHAN(g, ctx->Current.RasterColor[1]);
-      UNCLAMPED_FLOAT_TO_CHAN(b, ctx->Current.RasterColor[2]);
-      UNCLAMPED_FLOAT_TO_CHAN(a, ctx->Current.RasterColor[3]);
-      for (i = 0; i < drawWidth; i++) {
-         rgba[i][RCOMP] = r;
-         rgba[i][GCOMP] = g;
-         rgba[i][BCOMP] = b;
-         rgba[i][ACOMP] = a;
-      }
-   }
-   else {
-      GLint i;
-      for (i = 0; i < drawWidth; i++) {
-	 ispan[i] = ctx->Current.RasterIndex;
-      }
-   }
+   _mesa_span_default_color(ctx, &span);
+
+   if (ctx->Fog.Enabled)
+      _mesa_span_default_fog(ctx, &span);
 
    if (type==GL_UNSIGNED_SHORT && sizeof(GLdepth)==sizeof(GLushort)
        && !bias_or_scale && !zoom && ctx->Visual.rgbMode) {
       /* Special case: directly write 16-bit depth values */
       GLint row;
       for (row = 0; row < height; row++, y++) {
-         GLdepth zspan[MAX_WIDTH];
          const GLushort *zptr = (const GLushort *)
             _mesa_image_address(&ctx->Unpack, pixels, width, height,
                                 GL_DEPTH_COMPONENT, type, 0, row, 0);
          GLint i;
-         for (i = 0; i < width; i++)
-            zspan[i] = zptr[i];
-         _old_write_rgba_span(ctx, width, x, y, zspan, 0, rgba,
-                               NULL, GL_BITMAP);
+         for (i = 0; i < drawWidth; i++)
+            span.zArray[i] = zptr[i];
+
+         span.x = x;
+         span.y = y;
+         span.end = drawWidth;
+         span.filledDepth = GL_TRUE;  /* XXX temporary */
+         _mesa_write_rgba_span(ctx, &span, GL_BITMAP);
       }
    }
    else if (type==GL_UNSIGNED_INT && ctx->Visual.depthBits == 32
@@ -667,8 +646,15 @@ draw_depth_pixels( GLcontext *ctx, GLint x, GLint y,
          const GLuint *zptr = (const GLuint *)
             _mesa_image_address(&ctx->Unpack, pixels, width, height,
                                 GL_DEPTH_COMPONENT, type, 0, row, 0);
-         _old_write_rgba_span(ctx, width, x, y, zptr, 0, rgba,
-                               NULL, GL_BITMAP);
+
+         /* XXX get rid of this loop.  use zArray pointer in span */
+         GLint i;
+         for (i = 0; i < drawWidth; i++)
+            span.zArray[i] = zptr[i];
+         span.x = x;
+         span.y = y;
+         span.end = drawWidth;
+         _mesa_write_rgba_span(ctx, &span, GL_BITMAP);
       }
    }
    else {
@@ -676,7 +662,6 @@ draw_depth_pixels( GLcontext *ctx, GLint x, GLint y,
       GLint row;
       for (row = 0; row < height; row++, y++) {
          GLfloat fspan[MAX_WIDTH];
-         GLdepth zspan[MAX_WIDTH];
          const GLvoid *src = _mesa_image_address(&ctx->Unpack,
                 pixels, width, height, GL_DEPTH_COMPONENT, type, 0, row, 0);
          _mesa_unpack_depth_span( ctx, drawWidth, fspan, type, src,
@@ -686,31 +671,35 @@ draw_depth_pixels( GLcontext *ctx, GLint x, GLint y,
             const GLfloat zs = ctx->DepthMaxF;
             GLint i;
             for (i = 0; i < drawWidth; i++) {
-               zspan[i] = (GLdepth) (fspan[i] * zs);
+               span.zArray[i] = (GLdepth) (fspan[i] * zs);
             }
          }
 
          if (ctx->Visual.rgbMode) {
             if (zoom) {
-               _mesa_write_zoomed_rgba_span(ctx, width, x, y, zspan, 0,
-                                            (const GLchan (*)[4]) rgba, desty);
+               _mesa_write_zoomed_rgba_span(ctx, width, x, y, span.zArray, 0,
+                                (const GLchan (*)[4]) span.color.rgba, desty);
             }
             else {
-               _old_write_rgba_span(ctx, width, x, y, zspan, 0,
-                                     rgba, NULL, GL_BITMAP);
+               span.x = x;
+               span.y = y;
+               span.end = drawWidth;
+               _mesa_write_rgba_span(ctx, &span, GL_BITMAP);
             }
          }
          else {
             if (zoom) {
-               _mesa_write_zoomed_index_span(ctx, width, x, y, zspan, 0,
-                                             ispan, GL_BITMAP);
+               _mesa_write_zoomed_index_span(ctx, drawWidth, x, y,
+                                             span.zArray, 0,
+                                             span.color.index, GL_BITMAP);
             }
             else {
-               _old_write_index_span(ctx, width, x, y, zspan, 0,
-                                      ispan, NULL, GL_BITMAP);
+               span.x = x;
+               span.y = y;
+               span.end = drawWidth;
+               _mesa_write_index_span(ctx, &span, GL_BITMAP);
             }
          }
-
       }
    }
 }
@@ -728,11 +717,13 @@ draw_rgba_pixels( GLcontext *ctx, GLint x, GLint y,
    const struct gl_pixelstore_attrib *unpack = &ctx->Unpack;
    const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
    const GLint desty = y;
-   GLdepth zspan[MAX_WIDTH];
-   GLfloat fogSpan[MAX_WIDTH];
    GLboolean quickDraw;
    GLfloat *convImage = NULL;
    GLuint transferOps = ctx->_ImageTransferState;
+   struct sw_span span;
+
+   INIT_SPAN(span);
+   span.arrayMask |= SPAN_RGBA;
 
    if (!_mesa_is_legal_format_and_type(format, type)) {
       _mesa_error(ctx, GL_INVALID_ENUM, "glDrawPixels(format or type)");
@@ -756,11 +747,14 @@ draw_rgba_pixels( GLcontext *ctx, GLint x, GLint y,
          fog = _mesa_z_to_fogfactor(ctx, ctx->Current.RasterDistance);
 
       for (i=0;i<width;i++) {
-	 zspan[i] = z;
-         fogSpan[i] = fog;
+	 span.zArray[i] = z;
+         span.fogArray[i] = fog;
       }
    }
 
+   if (ctx->Fog.Enabled)
+      _mesa_span_default_fog(ctx, &span);
+   span.arrayMask |= SPAN_Z;
 
    if (SWRAST_CONTEXT(ctx)->_RasterMask == 0 && !zoom && x >= 0 && y >= 0
        && x + width <= ctx->DrawBuffer->Width
@@ -827,54 +821,47 @@ draw_rgba_pixels( GLcontext *ctx, GLint x, GLint y,
     * General solution
     */
    {
-      GLchan rgba[MAX_WIDTH][4];
       GLint row;
       if (width > MAX_WIDTH)
          width = MAX_WIDTH;
       for (row = 0; row < height; row++, y++) {
          const GLvoid *source = _mesa_image_address(unpack,
                   pixels, width, height, format, type, 0, row, 0);
-         _mesa_unpack_chan_color_span(ctx, width, GL_RGBA, (GLchan *) rgba,
+         /*         printf("Unpack f=0x%x t=0x%x\n", format, type);*/
+         _mesa_unpack_chan_color_span(ctx, width, GL_RGBA,
+                                      (GLchan *) span.color.rgba,
                                       format, type, source, unpack,
                                       transferOps);
+         if (0){
+            int k;
+            for (k = 0; k < width; k++)
+               printf("%02x ", span.color.rgba[k][3]);
+            printf("\n");
+         }
+
          if ((ctx->Pixel.MinMaxEnabled && ctx->MinMax.Sink) ||
              (ctx->Pixel.HistogramEnabled && ctx->Histogram.Sink))
             continue;
 
-         if (ctx->Texture._ReallyEnabled && ctx->Pixel.PixelTextureEnabled) {
-            GLchan primary_rgba[MAX_WIDTH][4];
-            GLuint unit;
-
-	    DEFMARRAY(GLfloat, texcoord, MAX_WIDTH, 4);/* mac 32k limitation */
-	    CHECKARRAY(texcoord, return); /* mac 32k limitation */
-
-            /* XXX not sure how multitexture is supposed to work here */
-            MEMCPY(primary_rgba, rgba, 4 * width * sizeof(GLchan));
-
-            for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
-               if (ctx->Texture.Unit[unit]._ReallyEnabled) {
-                  _mesa_pixeltexgen(ctx, width, (const GLchan (*)[4]) rgba,
-                                    texcoord);
-                  _old_swrast_texture_fragments( ctx, unit, width,
-					     texcoord, NULL,
-					     (CONST GLchan (*)[4]) primary_rgba,
-					     rgba);
-               }
-            }
-	    UNDEFARRAY(texcoord);  /* mac 32k limitation */
+         if (ctx->Pixel.PixelTextureEnabled && ctx->Texture._ReallyEnabled) {
+            span.end = width;
+            _swrast_pixel_texture(ctx, &span);
          }
 
          if (quickDraw) {
             (*swrast->Driver.WriteRGBASpan)(ctx, width, x, y,
-                                            (CONST GLchan (*)[4]) rgba, NULL);
+                                 (CONST GLchan (*)[4]) span.color.rgba, NULL);
          }
          else if (zoom) {
-            _mesa_write_zoomed_rgba_span(ctx, width, x, y, zspan, fogSpan,
-                                         (CONST GLchan (*)[4]) rgba, desty);
+            _mesa_write_zoomed_rgba_span(ctx, width, x, y, span.zArray,
+                                span.fogArray,
+                                (CONST GLchan (*)[4]) span.color.rgba, desty);
          }
          else {
-            _old_write_rgba_span(ctx, (GLuint) width, x, y, zspan, fogSpan,
-                                  rgba, NULL, GL_BITMAP);
+            span.x = x;
+            span.y = y;
+            span.end = width;
+            _mesa_write_rgba_span(ctx, &span, GL_BITMAP);
          }
       }
    }
@@ -905,7 +892,6 @@ _swrast_DrawPixels( GLcontext *ctx,
       _swrast_validate_derived( ctx );
 
    RENDER_START(swrast,ctx);
-
    switch (format) {
    case GL_STENCIL_INDEX:
       draw_stencil_pixels( ctx, x, y, width, height, type, pixels );