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+/**************************************************************************
+ *
+ * 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.
+ *
+ **************************************************************************/
+
+/**
+ * Private data structures, etc for the draw module.
+ */
+
+
+/**
+ * Authors:
+ * Keith Whitwell <keith@tungstengraphics.com>
+ * Brian Paul
+ */
+
+
+#ifndef DRAW_PRIVATE_H
+#define DRAW_PRIVATE_H
+
+
+#include "pipe/p_state.h"
+#include "pipe/p_defines.h"
+
+#include "x86/rtasm/x86sse.h"
+#include "pipe/tgsi/exec/tgsi_exec.h"
+
+
+struct gallivm_prog;
+struct gallivm_cpu_engine;
+
+/**
+ * Basic vertex info.
+ * Carry some useful information around with the vertices in the prim pipe.
+ */
+struct vertex_header {
+ unsigned clipmask:12;
+ unsigned edgeflag:1;
+ unsigned pad:3;
+ unsigned vertex_id:16;
+
+ float clip[4];
+
+ float data[][4]; /* Note variable size */
+};
+
+/* NOTE: It should match vertex_id size above */
+#define UNDEFINED_VERTEX_ID 0xffff
+
+/* XXX This is too large */
+#define MAX_VERTEX_SIZE ((2 + PIPE_MAX_SHADER_OUTPUTS) * 4 * sizeof(float))
+
+
+
+/**
+ * Basic info for a point/line/triangle primitive.
+ */
+struct prim_header {
+ float det; /**< front/back face determinant */
+ unsigned reset_line_stipple:1;
+ unsigned edgeflags:3;
+ unsigned pad:28;
+ struct vertex_header *v[3]; /**< 1 to 3 vertex pointers */
+};
+
+
+
+struct draw_context;
+
+/**
+ * Base class for all primitive drawing stages.
+ */
+struct draw_stage
+{
+ struct draw_context *draw; /**< parent context */
+
+ struct draw_stage *next; /**< next stage in pipeline */
+
+ struct vertex_header **tmp; /**< temp vert storage, such as for clipping */
+ unsigned nr_tmps;
+
+ void (*point)( struct draw_stage *,
+ struct prim_header * );
+
+ void (*line)( struct draw_stage *,
+ struct prim_header * );
+
+ void (*tri)( struct draw_stage *,
+ struct prim_header * );
+
+ void (*flush)( struct draw_stage *,
+ unsigned flags );
+
+ void (*reset_stipple_counter)( struct draw_stage * );
+
+ void (*destroy)( struct draw_stage * );
+};
+
+
+#define PRIM_QUEUE_LENGTH 16
+#define VCACHE_SIZE 32
+#define VCACHE_OVERFLOW 4
+#define VS_QUEUE_LENGTH (VCACHE_SIZE + VCACHE_OVERFLOW + 1) /* can never fill up */
+
+/**
+ * Private version of the compiled vertex_shader
+ */
+struct draw_vertex_shader {
+ const struct pipe_shader_state *state;
+#if defined(__i386__) || defined(__386__)
+ struct x86_function sse2_program;
+#endif
+#ifdef MESA_LLVM
+ struct gallivm_prog *llvm_prog;
+#endif
+};
+
+
+/* Internal function for vertex fetch.
+ */
+typedef void (*fetch_func)(const void *ptr, float *attrib);
+typedef void (*full_fetch_func)( struct draw_context *draw,
+ struct tgsi_exec_machine *machine,
+ const unsigned *elts,
+ unsigned count );
+
+
+
+/**
+ * Private context for the drawing module.
+ */
+struct draw_context
+{
+ /** Drawing/primitive pipeline stages */
+ struct {
+ struct draw_stage *first; /**< one of the following */
+
+ struct draw_stage *validate;
+
+ /* stages (in logical order) */
+ struct draw_stage *flatshade;
+ struct draw_stage *clip;
+ struct draw_stage *cull;
+ struct draw_stage *twoside;
+ struct draw_stage *offset;
+ struct draw_stage *unfilled;
+ struct draw_stage *stipple;
+ struct draw_stage *wide;
+ struct draw_stage *rasterize;
+ } pipeline;
+
+ /* pipe state that we need: */
+ const struct pipe_rasterizer_state *rasterizer;
+ struct pipe_viewport_state viewport;
+ struct pipe_vertex_buffer vertex_buffer[PIPE_ATTRIB_MAX];
+ struct pipe_vertex_element vertex_element[PIPE_ATTRIB_MAX];
+ const struct draw_vertex_shader *vertex_shader;
+
+ uint num_vs_outputs; /**< convenience, from vertex_shader */
+
+ /* user-space vertex data, buffers */
+ struct {
+ /** vertex element/index buffer (ex: glDrawElements) */
+ const void *elts;
+ /** bytes per index (0, 1, 2 or 4) */
+ unsigned eltSize;
+
+ /** vertex arrays */
+ const void *vbuffer[PIPE_ATTRIB_MAX];
+
+ /** constant buffer (for vertex shader) */
+ const void *constants;
+ } user;
+
+ /* Clip derived state:
+ */
+ float plane[12][4];
+ unsigned nr_planes;
+
+ boolean convert_wide_points; /**< convert wide points to tris? */
+ boolean convert_wide_lines; /**< convert side lines to tris? */
+
+ unsigned reduced_prim;
+
+ /** TGSI program interpreter runtime state */
+ struct tgsi_exec_machine machine;
+
+ /* Vertex fetch internal state
+ */
+ struct {
+ const ubyte *src_ptr[PIPE_ATTRIB_MAX];
+ unsigned pitch[PIPE_ATTRIB_MAX];
+ fetch_func fetch[PIPE_ATTRIB_MAX];
+ unsigned nr_attrs;
+ full_fetch_func fetch_func;
+ } vertex_fetch;
+
+ /* Post-tnl vertex cache:
+ */
+ struct {
+ unsigned referenced; /**< bitfield */
+ unsigned idx[VCACHE_SIZE + VCACHE_OVERFLOW];
+ struct vertex_header *vertex[VCACHE_SIZE + VCACHE_OVERFLOW];
+ unsigned overflow;
+
+ /** To find space in the vertex cache: */
+ struct vertex_header *(*get_vertex)( struct draw_context *draw,
+ unsigned i );
+ } vcache;
+
+ /* Vertex shader queue:
+ */
+ struct {
+ struct {
+ unsigned elt; /**< index into the user's vertex arrays */
+ struct vertex_header *dest; /**< points into vcache.vertex[] array */
+ } queue[VS_QUEUE_LENGTH];
+ unsigned queue_nr;
+ } vs;
+
+ /**
+ * Run the vertex shader on all vertices in the vertex queue.
+ */
+ void (*shader_queue_flush)(struct draw_context *draw);
+
+ /* Prim pipeline queue:
+ */
+ struct {
+ /* Need to queue up primitives until their vertices have been
+ * transformed by a vs queue flush.
+ */
+ struct prim_header queue[PRIM_QUEUE_LENGTH];
+ unsigned queue_nr;
+ } pq;
+
+ int use_sse : 1;
+#ifdef MESA_LLVM
+ struct gallivm_cpu_engine *engine;
+#endif
+
+ void *driver_private;
+};
+
+
+
+extern struct draw_stage *draw_unfilled_stage( struct draw_context *context );
+extern struct draw_stage *draw_twoside_stage( struct draw_context *context );
+extern struct draw_stage *draw_offset_stage( struct draw_context *context );
+extern struct draw_stage *draw_clip_stage( struct draw_context *context );
+extern struct draw_stage *draw_flatshade_stage( struct draw_context *context );
+extern struct draw_stage *draw_cull_stage( struct draw_context *context );
+extern struct draw_stage *draw_stipple_stage( struct draw_context *context );
+extern struct draw_stage *draw_wide_stage( struct draw_context *context );
+extern struct draw_stage *draw_validate_stage( struct draw_context *context );
+
+
+extern void draw_free_temp_verts( struct draw_stage *stage );
+
+extern void draw_alloc_temp_verts( struct draw_stage *stage, unsigned nr );
+
+extern void draw_reset_vertex_ids( struct draw_context *draw );
+
+
+extern int draw_vertex_cache_check_space( struct draw_context *draw,
+ unsigned nr_verts );
+
+extern void draw_vertex_cache_invalidate( struct draw_context *draw );
+extern void draw_vertex_cache_unreference( struct draw_context *draw );
+extern void draw_vertex_cache_reset_vertex_ids( struct draw_context *draw );
+
+
+extern void draw_vertex_shader_queue_flush( struct draw_context *draw );
+#ifdef MESA_LLVM
+extern void draw_vertex_shader_queue_flush_llvm( struct draw_context *draw );
+#endif
+
+struct tgsi_exec_machine;
+
+extern void draw_update_vertex_fetch( struct draw_context *draw );
+
+
+#define DRAW_FLUSH_SHADER_QUEUE 0x1 /* sized not to overflow, never raised */
+#define DRAW_FLUSH_PRIM_QUEUE 0x2
+#define DRAW_FLUSH_VERTEX_CACHE 0x4
+#define DRAW_FLUSH_STATE_CHANGE 0x8
+#define DRAW_FLUSH_BACKEND 0x10
+
+
+void draw_do_flush( struct draw_context *draw, unsigned flags );
+
+
+
+/**
+ * Get a writeable copy of a vertex.
+ * \param stage drawing stage info
+ * \param vert the vertex to copy (source)
+ * \param idx index into stage's tmp[] array to put the copy (dest)
+ * \return pointer to the copied vertex
+ */
+static INLINE struct vertex_header *
+dup_vert( struct draw_stage *stage,
+ const struct vertex_header *vert,
+ unsigned idx )
+{
+ struct vertex_header *tmp = stage->tmp[idx];
+ const uint vsize = sizeof(struct vertex_header)
+ + stage->draw->num_vs_outputs * 4 * sizeof(float);
+ memcpy(tmp, vert, vsize);
+ tmp->vertex_id = UNDEFINED_VERTEX_ID;
+ return tmp;
+}
+
+static INLINE float
+dot4(const float *a, const float *b)
+{
+ float result = (a[0]*b[0] +
+ a[1]*b[1] +
+ a[2]*b[2] +
+ a[3]*b[3]);
+
+ return result;
+}
+
+#endif /* DRAW_PRIVATE_H */
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