1 files changed, 114 insertions, 0 deletions
diff --git a/mesalib/src/mesa/tnl/t_vb_points.c b/mesalib/src/mesa/tnl/t_vb_points.c
new file mode 100644
index 000000000..a52505b4b
--- /dev/null
+++ b/mesalib/src/mesa/tnl/t_vb_points.c
@@ -0,0 +1,114 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  7.0
+ *
+ * Copyright (C) 1999-2007  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 "main/glheader.h"
+#include "main/mtypes.h"
+#include "main/dd.h"
+#include "main/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 point size for each vertex from the vertex eye-space Z
+ * coordinate and the point size attenuation factors.
+ * Only done when point size attenuation is enabled and vertex program is
+ * disabled.
+ */
+static GLboolean
+run_point_stage(GLcontext *ctx, struct tnl_pipeline_stage *stage)
+{
+   if (ctx->Point._Attenuated && !ctx->VertexProgram._Current) {
+      struct point_stage_data *store = POINT_STAGE_DATA(stage);
+      struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
+      const GLfloat *eyeCoord = (GLfloat *) VB->EyePtr->data + 2;
+      const GLint eyeCoordStride = VB->EyePtr->stride / sizeof(GLfloat);
+      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;
+
+      for (i = 0; i < VB->Count; i++) {
+         const GLfloat dist = FABSF(*eyeCoord);
+         const GLfloat q = p0 + dist * (p1 + dist * p2);
+         const GLfloat atten = (q != 0.0) ? SQRTF(1.0 / q) : 1.0;
+         size[i][0] = pointSize * atten; /* clamping done in rasterization */
+         eyeCoord += eyeCoordStride;
+      }
+
+      VB->AttribPtr[_TNL_ATTRIB_POINTSIZE] = &store->PointSize;
+   }
+
+   return GL_TRUE;
+}
+
+
+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 = _mesa_malloc(sizeof(*store));
+   store = POINT_STAGE_DATA(stage);
+   if (!store)
+      return GL_FALSE;
+
+   _mesa_vector4f_alloc( &store->PointSize, 0, VB->Size, 32 );
+   return GL_TRUE;
+}
+
+
+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 );
+      _mesa_free( store );
+      stage->privatePtr = NULL;
+   }
+}
+
+
+const struct tnl_pipeline_stage _tnl_point_attenuation_stage =
+{
+   "point size attenuation",	/* name */
+   NULL,			/* stage private data */
+   alloc_point_data,		/* alloc data */
+   free_point_data,		/* destructor */
+   NULL,
+   run_point_stage		/* run */
+};