Add infrastructure for t_vertex.c codegen. Add an example driver

for this which spits out C code for the generated functions.

1 files changed, 257 insertions, 0 deletions

diff --git a/src/mesa/tnl/t_vertex_c.c b/src/mesa/tnl/t_vertex_c.c
new file mode 100644
index 0000000000..d1ef7cd53c
--- /dev/null
+++ b/src/mesa/tnl/t_vertex_c.c
@@ -0,0 +1,257 @@
+/*
+ * Copyright 2003 Tungsten Graphics, inc.
+ * 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
+ * on 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 THEIR 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.
+ *
+ * Authors:
+ *    Keith Whitwell <keithw@tungstengraphics.com>
+ */
+
+#include "glheader.h"
+#include "context.h"
+#include "colormac.h"
+
+#include "t_context.h"
+#include "t_vertex.h"
+
+#include "simple_list.h"
+
+/* A version of code generation for t_clipspace_codegen.c which prints
+ * out 'c' code to implement the generated function.  A useful
+ * debugging tool, and in concert with something like tcc or a
+ * library-ized gcc, could do the whole job.
+ */
+
+
+static GLboolean emit( struct tnl_clipspace_codegen *p,
+		  const char *fmt,
+		  ... )
+{
+   if (p->buf_used < p->buf_size) {
+      va_list ap;
+      va_start( ap, fmt );  
+      p->buf_used += vsnprintf( p->buf + p->buf_used, 
+				p->buf_size - p->buf_used,
+				fmt, ap );   
+      va_end( ap );
+   }
+   
+   return p->buf_used < p->buf_size;
+}
+
+
+static GLboolean print_header( struct tnl_clipspace_codegen *p,
+			  struct tnl_clipspace *vtx )
+{
+   p->buf_used = 0;
+   p->out_offset = 0;
+
+   return 
+      emit(p,
+	   "struct tnl_clipspace_attr\n"
+	   "{\n"
+	   "   unsigned int attrib;          \n"
+	   "   unsigned int format;\n"
+	   "   unsigned int vertoffset;      \n"
+	   "   unsigned int vertattrsize;    \n"
+	   "   char *inputptr;\n"
+	   "   unsigned int inputstride;\n"
+	   "   void *insert;\n"
+	   "   void *emit;\n"
+	   "   void * extract;\n"
+	   "   const float *vp;   \n"
+	   "};\n"
+	   "\n"
+	 ) && 
+      emit(p, 
+	   "void emit_vertices( int start, int end, char *dest, \n"
+	   "                    struct tnl_clipspace_attr *a) \n"
+	   "{\n"
+	   "   int i;"
+	   "   for (i = start ; i < end ; i++, dest += %d) {\n",
+	   vtx->vertex_size);
+
+}
+
+static GLboolean print_footer( struct tnl_clipspace_codegen *p )
+{
+   return 
+      emit(p, 
+	   "   }\n"
+	   "}\n"
+	 );
+}
+
+static GLboolean emit_reg( struct tnl_clipspace_codegen *p, GLint reg )
+{
+   int idx = reg & REG_OFFSET_MASK;
+
+   switch (reg & REG_MASK) {
+   case REG_IN: return emit(p, "in[%d]", idx);
+   case REG_VP: return emit(p, "vp[%d]", idx);
+   case REG_TMP: return emit(p, "temp[%d]", idx); /* not used? */
+   case REG_OUT: return emit(p, "out[%d]", idx);
+   }
+   
+   return GL_FALSE;
+}
+
+static GLboolean print_mov( struct tnl_clipspace_codegen *p, GLint dest, GLint src )
+{
+   return 
+      emit(p, "         ") &&
+      emit_reg(p, dest) &&
+      emit(p, " = ") &&
+      emit_reg(p, src) &&
+      emit(p, ";\n");
+}
+
+
+static GLboolean print_const( struct tnl_clipspace_codegen *p, 
+			 GLint dest, GLfloat c )
+{
+   return 
+      emit(p, "         ") &&
+      emit_reg(p, dest) &&
+      emit(p, " = %g;\n", c);
+}
+
+static GLboolean print_const_chan( struct tnl_clipspace_codegen *p, 
+			      GLint dest, GLchan c )
+{
+   return 
+      emit(p, "         ") &&
+      emit_reg(p, dest) &&
+      emit(p, " = ") &&
+#if CHAN_TYPE == GL_FLOAT
+      emit(p, "%f", c) &&
+#else
+      emit(p, "%d", c) &&
+#endif
+      emit(p, ";\n");
+}
+
+static GLboolean print_const_ubyte( struct tnl_clipspace_codegen *p, 
+			       GLint dest, GLubyte c )
+{
+   return 
+      emit(p, "         ") &&
+      emit_reg(p, dest) &&
+      emit(p, " = %x;\n", c);
+}
+
+static GLboolean print_mad( struct tnl_clipspace_codegen *p,
+		       GLint dest, GLint src0, GLint src1, GLint src2 )
+{
+   return 
+      emit(p, "         ") &&
+      emit_reg(p, dest) &&
+      emit(p, " = ") &&
+      emit_reg(p, src0) &&
+      emit(p, " * ") &&
+      emit_reg(p, src1) &&
+      emit(p, " + ") &&
+      emit_reg(p, src2) &&
+      emit(p, ";\n");
+}
+
+static GLboolean print_float_to_ubyte( struct tnl_clipspace_codegen *p,
+				  GLint dest, GLint src )
+{
+   return 
+      emit(p, "         ") &&
+      emit(p, "UNCLAMPED_FLOAT_TO_UBYTE(") &&
+      emit_reg(p, dest) &&
+      emit(p, ", ") &&
+      emit_reg(p, src) &&
+      emit(p, ");\n");
+}
+
+static GLboolean print_float_to_chan( struct tnl_clipspace_codegen *p, 
+				 GLint dest, GLint src )
+{
+   return 
+      emit(p, "         ") &&
+      emit(p, "UNCLAMPED_FLOAT_TO_CHAN(") &&
+      emit_reg(p, dest) &&
+      emit(p, ", ") &&
+      emit_reg(p, src) &&
+      emit(p, ");\n");
+}
+
+
+static GLboolean print_attr_header( struct tnl_clipspace_codegen *p, 
+			       struct tnl_clipspace_attr *a, 
+			       GLint j,
+			       GLenum out_type, 
+			       GLboolean need_vp)
+{
+   char *out_type_str = "void";
+
+   switch(out_type) {
+   case GL_FLOAT: out_type_str = "float"; break;
+   case GL_UNSIGNED_BYTE: out_type_str = "unsigned char"; break;
+   case GL_UNSIGNED_SHORT: out_type_str = "unsigned short"; break;
+   }
+
+   return 
+      emit(p, "      {\n") &&
+      (need_vp ? emit(p, "         const float *vp = a[%d].vp;\n", j) : 1) &&
+      emit(p, "         %s *out = (%s *)(dest + %d);\n", 
+	   out_type_str, out_type_str, a[j].vertoffset) &&
+      emit(p, "         const float *in = (const float *)a[%d].inputptr;\n", 
+	   j) &&
+      emit(p, "         a[%d].inputptr += a[%d].inputstride;\n", j, j);
+}
+
+static GLboolean print_attr_footer( struct tnl_clipspace_codegen *p )
+{
+   return 
+      emit(p, "      }\n");
+}
+
+static emit_func print_store_func( struct tnl_clipspace_codegen *p ) 
+{
+   fprintf(stderr, "%s: emitted:\n%s\n", __FUNCTION__, p->buf);
+   
+   return 0;
+}
+
+void _tnl_init_c_codegen( struct tnl_clipspace_codegen *p ) 
+{
+   p->emit_header = print_header;
+   p->emit_footer = print_footer;
+   p->emit_attr_header = print_attr_header;
+   p->emit_attr_footer = print_attr_footer;
+   p->emit_mov = print_mov;
+   p->emit_const = print_const;
+   p->emit_mad = print_mad;
+   p->emit_float_to_chan = print_float_to_chan;
+   p->emit_const_chan = print_const_chan;
+   p->emit_float_to_ubyte = print_float_to_ubyte;
+   p->emit_const_ubyte = print_const_ubyte;
+   p->emit_store_func = print_store_func;
+   
+   make_empty_list(&p->codegen_list);
+
+   p->buf_size = 2048;
+   p->buf = MALLOC(p->buf_size);
+}