Checkpoint of a super-simplified i915 driver in the pipe model.

Doesn't yet compile, but when it does, it will only draw gouraud tris
and even those will be as simple as possible.  Needs some 'winsys' support
also before that can happen.

1 files changed, 201 insertions, 0 deletions

diff --git a/src/mesa/pipe/i915simple/i915_prim_emit.c b/src/mesa/pipe/i915simple/i915_prim_emit.c
new file mode 100644
index 0000000000..97e337451e
--- /dev/null
+++ b/src/mesa/pipe/i915simple/i915_prim_emit.c
@@ -0,0 +1,201 @@
+/**************************************************************************
+ * 
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * 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, sub license, 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 (including the
+ * next paragraph) 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
+ * 
+ **************************************************************************/
+
+
+#include "imports.h"
+#include "macros.h"
+
+#include "pipe/draw/draw_private.h"
+
+#include "i915_context.h"
+#include "i915_winsys.h"
+#include "i915_reg.h"
+#include "i915_state.h"
+
+
+
+/**
+ * Primitive emit to hardware.  No support for vertex buffers or any
+ * nice fast paths.
+ */
+struct setup_stage {
+   struct draw_stage stage; /**< This must be first (base class) */
+
+   struct i915_context *i915;   
+};
+
+
+
+/**
+ * Basically a cast wrapper.
+ */
+static INLINE struct setup_stage *setup_stage( struct draw_stage *stage )
+{
+   return (struct setup_stage *)stage;
+}
+
+static inline unsigned pack_ub4( unsigned char b0,
+				 unsigned char b1,
+				 unsigned char b2,
+				 unsigned char b3 )
+{
+   return ((((unsigned int)b0) << 0) |
+	   (((unsigned int)b1) << 8) |
+	   (((unsigned int)b2) << 16) |
+	   (((unsigned int)b3) << 24));
+}
+
+static inline unsigned fui( float f )
+{
+   union {
+      float f;
+      unsigned ui;
+   } fi;
+
+   fi.f = f;
+   return fi.ui;
+}
+
+static inline unsigned char float_to_ubyte( float f )
+{
+   unsigned char ub;
+   UNCLAMPED_FLOAT_TO_UBYTE(ub, f);
+   return ub;
+}
+
+
+/* Hardcoded vertex format: xyz/rgba
+ */
+static inline void
+emit_hw_vertex( unsigned *ptr,
+		struct vertex_header *vertex )
+{
+   ptr[0] = fui( vertex->data[0][0] );
+   ptr[1] = fui( vertex->data[0][1] );
+   ptr[2] = fui( vertex->data[0][2] );
+
+   ptr[3] = pack_ub4( float_to_ubyte( vertex->data[1][0] ),
+		      float_to_ubyte( vertex->data[1][1] ),
+		      float_to_ubyte( vertex->data[1][2] ),
+		      float_to_ubyte( vertex->data[1][3] ) );
+}
+		
+		
+
+
+static inline void 
+emit_prim( struct draw_stage *stage, 
+	   struct prim_header *prim,
+	   unsigned hwprim,
+	   unsigned nr )
+{
+   struct i915_context *i915 = setup_stage(stage)->i915;
+   struct i915_winsys *winsys = i915->winsys;
+   unsigned vertex_size = 4 * sizeof(int);
+   unsigned *ptr;
+   unsigned i;
+
+   i915_emit_hardware_state( i915 );
+
+   ptr = winsys->batch_start( winsys, nr * vertex_size, 0 );
+   if (ptr == 0) {
+      winsys->batch_flush( winsys );
+      ptr = winsys->batch_start( winsys, nr * vertex_size, 0 );
+      if (ptr == 0) {
+	 assert(0);
+	 return;
+      }
+   }
+
+   /* Emit each triangle as a single primitive.  I told you this was
+    * simple.
+    */
+   *ptr++ = (_3DPRIMITIVE | 
+	     hwprim |
+	     ((4 + vertex_size * nr)/4 - 2));
+
+   for (i = 0; i < nr; i++) {
+      emit_hw_vertex(ptr, prim->v[i]);
+      ptr += vertex_size / sizeof(int);
+   }
+}
+
+
+static void 
+setup_tri( struct draw_stage *stage, struct prim_header *prim )
+{
+   emit_prim( stage, prim, PRIM3D_TRILIST, 3 );
+}
+
+
+static void
+setup_line(struct draw_stage *stage, struct prim_header *prim)
+{
+   emit_prim( stage, prim, PRIM3D_LINELIST, 2 );
+}
+
+
+static void
+setup_point(struct draw_stage *stage, struct prim_header *prim)
+{
+   emit_prim( stage, prim, PRIM3D_POINTLIST, 1 );
+}
+
+
+
+static void setup_begin( struct draw_stage *stage )
+{
+}
+
+
+static void setup_end( struct draw_stage *stage )
+{
+}
+
+static void reset_stipple_counter( struct draw_stage *stage )
+{
+}
+
+
+/**
+ * Create a new primitive setup/render stage.
+ */
+struct draw_stage *i915_draw_render_stage( struct i915_context *i915 )
+{
+   struct setup_stage *setup = CALLOC_STRUCT(setup_stage);
+
+   setup->i915 = i915;
+   setup->stage.draw = i915->draw;
+   setup->stage.begin = setup_begin;
+   setup->stage.point = setup_point;
+   setup->stage.line = setup_line;
+   setup->stage.tri = setup_tri;
+   setup->stage.end = setup_end;
+   setup->stage.reset_stipple_counter = reset_stipple_counter;
+
+   return &setup->stage;
+}