1 files changed, 123 insertions, 0 deletions
diff --git a/src/mesa/tnl/t_vb_points.c b/src/mesa/tnl/t_vb_points.c
new file mode 100644
index 0000000..746ea8b
--- /dev/null
+++ b/src/mesa/tnl/t_vb_points.c
@@ -0,0 +1,123 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  6.1
+ *
+ * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Brian Paul
+ */
+
+#include "mtypes.h"
+#include "imports.h"
+#include "t_context.h"
+#include "t_pipeline.h"
+
+
+struct point_stage_data {
+   GLvector4f PointSize;
+};
+
+#define POINT_STAGE_DATA(stage) ((struct point_stage_data *)stage->privatePtr)
+
+
+/*
+ * Compute attenuated point sizes
+ */
+static GLboolean run_point_stage( GLcontext *ctx,
+				  struct tnl_pipeline_stage *stage )
+{
+   struct point_stage_data *store = POINT_STAGE_DATA(stage);
+   struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
+   const GLfloat (*eye)[4] = (const GLfloat (*)[4]) VB->EyePtr->data;
+   const GLfloat p0 = ctx->Point.Params[0];
+   const GLfloat p1 = ctx->Point.Params[1];
+   const GLfloat p2 = ctx->Point.Params[2];
+   const GLfloat pointSize = ctx->Point._Size;
+   GLfloat (*size)[4] = store->PointSize.data;
+   GLuint i;
+
+   if (stage->changed_inputs) {
+      /* XXX do threshold and min/max clamping here? */
+      for (i = 0; i < VB->Count; i++) {
+	 const GLfloat dist = -eye[i][2];
+	 /* GLfloat dist = SQRTF(pos[0]*pos[0]+pos[1]*pos[1]+pos[2]*pos[2]);*/
+	 size[i][0] = pointSize / (p0 + dist * (p1 + dist * p2));
+      }
+   }
+
+   VB->PointSizePtr = &store->PointSize;
+   VB->AttribPtr[_TNL_ATTRIB_POINTSIZE] = &store->PointSize;
+
+   return GL_TRUE;
+}
+
+
+/* If point size attenuation is on we'll compute the point size for
+ * each vertex in a special pipeline stage.
+ */
+static void check_point_size( GLcontext *ctx, struct tnl_pipeline_stage *d )
+{
+   d->active = ctx->Point._Attenuated && !ctx->VertexProgram._Enabled;
+}
+
+static GLboolean alloc_point_data( GLcontext *ctx,
+				   struct tnl_pipeline_stage *stage )
+{
+   struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
+   struct point_stage_data *store;
+   stage->privatePtr = MALLOC(sizeof(*store));
+   store = POINT_STAGE_DATA(stage);
+   if (!store)
+      return GL_FALSE;
+
+   _mesa_vector4f_alloc( &store->PointSize, 0, VB->Size, 32 );
+
+   /* Now run the stage.
+    */
+   stage->run = run_point_stage;
+   return stage->run( ctx, stage );
+}
+
+
+static void free_point_data( struct tnl_pipeline_stage *stage )
+{
+   struct point_stage_data *store = POINT_STAGE_DATA(stage);
+   if (store) {
+      _mesa_vector4f_free( &store->PointSize );
+      FREE( store );
+      stage->privatePtr = 0;
+   }
+}
+
+const struct tnl_pipeline_stage _tnl_point_attenuation_stage =
+{
+   "point size attenuation",	/* name */
+   _NEW_POINT|_NEW_PROGRAM,	/* check_state */
+   _NEW_POINT,			/* run_state */
+   GL_FALSE,			/* active */
+   _TNL_BIT_POS,		/* inputs */
+   _TNL_BIT_POS,		/* outputs */
+   0,				/* changed_inputs (temporary value) */
+   NULL,			/* stage private data */
+   free_point_data,		/* destructor */
+   check_point_size,		/* check */
+   alloc_point_data		/* run -- initially set to alloc data */
+};