--- /dev/null
+/**************************************************************************
+ *
+ * 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.
+ *
+ **************************************************************************/
+
+ /*
+ * Authors:
+ * Keith Whitwell <keith@tungstengraphics.com>
+ */
+
+#include "pipe/p_util.h"
+#include "draw/draw_context.h"
+#include "draw/draw_private.h"
+#include "draw/draw_vertex.h"
+#include "draw/draw_pt.h"
+
+/* The simplest 'middle end' in the new vertex code.
+ *
+ * The responsibilities of a middle end are to:
+ * - perform vertex fetch using
+ * - draw vertex element/buffer state
+ * - a list of fetch indices we received as an input
+ * - run the vertex shader
+ * - cliptest,
+ * - clip coord calculation
+ * - viewport transformation
+ * - if necessary, run the primitive pipeline, passing it:
+ * - a linear array of vertex_header vertices constructed here
+ * - a set of draw indices we received as an input
+ * - otherwise, drive the hw backend,
+ * - allocate space for hardware format vertices
+ * - translate the vertex-shader output vertices to hw format
+ * - calling the backend draw functions.
+ *
+ * For convenience, we provide a helper function to drive the hardware
+ * backend given similar inputs to those required to run the pipeline.
+ *
+ * In the case of passthrough mode, many of these actions are disabled
+ * or noops, so we end up doing:
+ *
+ * - perform vertex fetch
+ * - drive the hw backend
+ *
+ * IE, basically just vertex fetch to post-vs-format vertices,
+ * followed by a call to the backend helper function.
+ */
+
+
+struct fetch_pipeline_middle_end {
+ struct draw_pt_middle_end base;
+ struct draw_context *draw;
+
+ struct {
+ const ubyte *ptr;
+ unsigned pitch;
+ void (*fetch)( const void *from, float *attrib);
+ void (*emit)( const float *attrib, float **out );
+ } fetch[PIPE_MAX_ATTRIBS];
+
+ unsigned nr_fetch;
+ unsigned pipeline_vertex_size;
+ unsigned prim;
+};
+
+
+static void fetch_NULL( const void *from,
+ float *attrib )
+{
+}
+
+
+
+static void emit_R32_FLOAT( const float *attrib,
+ float **out )
+{
+ (*out)[0] = attrib[0];
+ (*out) += 1;
+}
+
+static void emit_R32G32_FLOAT( const float *attrib,
+ float **out )
+{
+ (*out)[0] = attrib[0];
+ (*out)[1] = attrib[1];
+ (*out) += 2;
+}
+
+static void emit_R32G32B32_FLOAT( const float *attrib,
+ float **out )
+{
+ (*out)[0] = attrib[0];
+ (*out)[1] = attrib[1];
+ (*out)[2] = attrib[2];
+ (*out) += 3;
+}
+
+static void emit_R32G32B32A32_FLOAT( const float *attrib,
+ float **out )
+{
+ (*out)[0] = attrib[0];
+ (*out)[1] = attrib[1];
+ (*out)[2] = attrib[2];
+ (*out)[3] = attrib[3];
+ (*out) += 4;
+}
+
+static void emit_header( const float *attrib,
+ float **out )
+{
+ (*out)[0] = 0;
+ (*out)[1] = 0;
+ (*out)[2] = 0;
+ (*out)[3] = 0;
+ (*out)[3] = 1;
+ (*out) += 5;
+}
+
+/**
+ * General-purpose fetch from user's vertex arrays, emit to driver's
+ * vertex buffer.
+ *
+ * XXX this is totally temporary.
+ */
+static void
+fetch_store_general( struct fetch_pipeline_middle_end *fpme,
+ void *out_ptr,
+ const unsigned *fetch_elts,
+ unsigned count )
+{
+ float *out = (float *)out_ptr;
+ uint i, j;
+
+ for (i = 0; i < count; i++) {
+ unsigned elt = fetch_elts[i];
+
+ for (j = 0; j < fpme->nr_fetch; j++) {
+ float attrib[4];
+ const ubyte *from = (fpme->fetch[j].ptr +
+ fpme->fetch[j].pitch * elt);
+
+ fpme->fetch[j].fetch( from, attrib );
+ fpme->fetch[j].emit( attrib, &out );
+ }
+ }
+}
+
+
+/* We aren't running a vertex shader, but are running the pipeline.
+ * That means the vertices we need to build look like:
+ *
+ * dw0: vertex header (zero?)
+ * dw1: clip coord 0
+ * dw2: clip coord 1
+ * dw3: clip coord 2
+ * dw4: clip coord 4
+ * dw5: screen coord 0
+ * dw6: screen coord 0
+ * dw7: screen coord 0
+ * dw8: screen coord 0
+ * dw9: other attribs...
+ *
+ */
+static void fetch_pipeline_prepare( struct draw_pt_middle_end *middle,
+ unsigned prim )
+{
+ static const float zero = 0;
+ struct fetch_pipeline_middle_end *fpme = (struct fetch_pipeline_middle_end *)middle;
+ struct draw_context *draw = fpme->draw;
+ unsigned i, nr = 0;
+
+ fpme->prim = prim;
+
+ /* Emit the vertex header and empty clipspace coord field:
+ */
+ {
+ fpme->fetch[nr].ptr = NULL;
+ fpme->fetch[nr].pitch = 0;
+ fpme->fetch[nr].fetch = fetch_NULL;
+ fpme->fetch[nr].emit = emit_header;
+ nr++;
+ }
+
+
+ /* Need to look at vertex shader inputs (we know it is a
+ * passthrough shader, so these define the outputs too). If we
+ * were running a shader, we'd still be looking at the inputs at
+ * this point.
+ */
+ for (i = 0; i < draw->vertex_shader->info.num_inputs; i++) {
+ unsigned buf = draw->vertex_element[i].vertex_buffer_index;
+ enum pipe_format format = draw->vertex_element[i].src_format;
+
+ fpme->fetch[nr].ptr = ((const ubyte *) draw->user.vbuffer[buf] +
+ draw->vertex_buffer[buf].buffer_offset +
+ draw->vertex_element[i].src_offset);
+
+ fpme->fetch[nr].pitch = draw->vertex_buffer[buf].pitch;
+ fpme->fetch[nr].fetch = draw_get_fetch_func( format );
+
+ /* Always do this -- somewhat redundant...
+ */
+ fpme->fetch[nr].emit = emit_R32G32B32A32_FLOAT;
+ nr++;
+ }
+
+ fpme->nr_fetch = nr;
+ fpme->pipeline_vertex_size = (5 + (nr-1) * 4) * sizeof(float);
+}
+
+
+
+/**
+ * Add a point to the primitive queue.
+ * \param i0 index into user's vertex arrays
+ */
+static void do_point( struct draw_context *draw,
+ const char *v0 )
+{
+ struct prim_header prim;
+
+ prim.reset_line_stipple = 0;
+ prim.edgeflags = 1;
+ prim.pad = 0;
+ prim.v[0] = (struct vertex_header *)v0;
+
+ draw->pipeline.first->point( draw->pipeline.first, &prim );
+}
+
+
+/**
+ * Add a line to the primitive queue.
+ * \param i0 index into user's vertex arrays
+ * \param i1 index into user's vertex arrays
+ */
+static void do_line( struct draw_context *draw,
+ const char *v0,
+ const char *v1 )
+{
+ struct prim_header prim;
+
+ prim.reset_line_stipple = 1; /* fixme */
+ prim.edgeflags = 1;
+ prim.pad = 0;
+ prim.v[0] = (struct vertex_header *)v0;
+ prim.v[1] = (struct vertex_header *)v1;
+
+ draw->pipeline.first->line( draw->pipeline.first, &prim );
+}
+
+/**
+ * Add a triangle to the primitive queue.
+ */
+static void do_triangle( struct draw_context *draw,
+ char *v0,
+ char *v1,
+ char *v2 )
+{
+ struct prim_header prim;
+
+// _mesa_printf("tri %d %d %d\n", i0, i1, i2);
+ prim.reset_line_stipple = 1;
+ prim.edgeflags = ~0;
+ prim.pad = 0;
+ prim.v[0] = (struct vertex_header *)v0;
+ prim.v[1] = (struct vertex_header *)v1;
+ prim.v[2] = (struct vertex_header *)v2;
+
+ draw->pipeline.first->tri( draw->pipeline.first, &prim );
+}
+
+
+static void run_pipeline( struct fetch_pipeline_middle_end *fpme,
+ char *verts,
+ const ushort *elts,
+ unsigned count )
+{
+ struct draw_context *draw = fpme->draw;
+ unsigned stride = fpme->pipeline_vertex_size;
+ unsigned i;
+
+ switch (fpme->prim) {
+ case PIPE_PRIM_POINTS:
+ for (i = 0; i < count; i++)
+ do_point( draw,
+ verts + stride * elts[i] );
+ break;
+ case PIPE_PRIM_LINES:
+ for (i = 0; i+1 < count; i += 2)
+ do_line( draw,
+ verts + stride * elts[i+0],
+ verts + stride * elts[i+1]);
+ break;
+ case PIPE_PRIM_TRIANGLES:
+ for (i = 0; i+2 < count; i += 3)
+ do_triangle( draw,
+ verts + stride * elts[i+0],
+ verts + stride * elts[i+1],
+ verts + stride * elts[i+2]);
+ break;
+ }
+}
+
+
+
+
+static void fetch_pipeline_run( struct draw_pt_middle_end *middle,
+ const unsigned *fetch_elts,
+ unsigned fetch_count,
+ const ushort *draw_elts,
+ unsigned draw_count )
+{
+ struct fetch_pipeline_middle_end *fpme = (struct fetch_pipeline_middle_end *)middle;
+ struct draw_context *draw = fpme->draw;
+ char *pipeline_verts;
+
+ pipeline_verts = MALLOC( fpme->pipeline_vertex_size *
+ fetch_count );
+ if (!pipeline_verts) {
+ assert(0);
+ return;
+ }
+
+
+ /* Single routine to fetch vertices and emit pipeline verts.
+ */
+ fetch_store_general( fpme,
+ pipeline_verts,
+ fetch_elts,
+ fetch_count );
+
+
+ run_pipeline( fpme,
+ pipeline_verts,
+ draw_elts,
+ draw_count );
+
+
+ /* Done -- that was easy, wasn't it:
+ */
+ FREE( pipeline_verts );
+}
+
+
+
+static void fetch_pipeline_finish( struct draw_pt_middle_end *middle )
+{
+ /* nothing to do */
+}
+
+static void fetch_pipeline_destroy( struct draw_pt_middle_end *middle )
+{
+ FREE(middle);
+}
+
+
+struct draw_pt_middle_end *draw_pt_fetch_pipeline( struct draw_context *draw )
+{
+ struct fetch_pipeline_middle_end *fetch_pipeline = CALLOC_STRUCT( fetch_pipeline_middle_end );
+
+ fetch_pipeline->base.prepare = fetch_pipeline_prepare;
+ fetch_pipeline->base.run = fetch_pipeline_run;
+ fetch_pipeline->base.finish = fetch_pipeline_finish;
+ fetch_pipeline->base.destroy = fetch_pipeline_destroy;
+
+ fetch_pipeline->draw = draw;
+
+ return &fetch_pipeline->base;
+}
+
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