1 files changed, 175 insertions, 0 deletions
diff --git a/src/gallium/drivers/softpipe/sp_quad_fs.c b/src/gallium/drivers/softpipe/sp_quad_fs.c
new file mode 100644
index 0000000000..907e94b59b
--- /dev/null
+++ b/src/gallium/drivers/softpipe/sp_quad_fs.c
@@ -0,0 +1,175 @@
+/**************************************************************************
+ * 
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ * Copyright 2008 VMware, 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 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.
+ * 
+ **************************************************************************/
+
+/* Vertices are just an array of floats, with all the attributes
+ * packed.  We currently assume a layout like:
+ *
+ * attr[0][0..3] - window position
+ * attr[1..n][0..3] - remaining attributes.
+ *
+ * Attributes are assumed to be 4 floats wide but are packed so that
+ * all the enabled attributes run contiguously.
+ */
+
+#include "util/u_math.h"
+#include "util/u_memory.h"
+#include "pipe/p_defines.h"
+#include "pipe/p_shader_tokens.h"
+
+#include "sp_context.h"
+#include "sp_state.h"
+#include "sp_quad.h"
+#include "sp_quad_pipe.h"
+
+
+struct quad_shade_stage
+{
+   struct quad_stage stage;  /**< base class */
+
+   /* no other fields at this time */
+};
+
+
+/** cast wrapper */
+static INLINE struct quad_shade_stage *
+quad_shade_stage(struct quad_stage *qs)
+{
+   return (struct quad_shade_stage *) qs;
+}
+
+
+/**
+ * Execute fragment shader for the four fragments in the quad.
+ * \return TRUE if quad is alive, FALSE if all four pixels are killed
+ */
+static INLINE boolean
+shade_quad(struct quad_stage *qs, struct quad_header *quad)
+{
+   struct softpipe_context *softpipe = qs->softpipe;
+   struct tgsi_exec_machine *machine = softpipe->fs_machine;
+
+   /* run shader */
+   return softpipe->fs->run( softpipe->fs, machine, quad );
+}
+
+
+
+static void
+coverage_quad(struct quad_stage *qs, struct quad_header *quad)
+{
+   struct softpipe_context *softpipe = qs->softpipe;
+   uint cbuf;
+
+   /* loop over colorbuffer outputs */
+   for (cbuf = 0; cbuf < softpipe->framebuffer.nr_cbufs; cbuf++) {
+      float (*quadColor)[4] = quad->output.color[cbuf];
+      unsigned j;
+      for (j = 0; j < QUAD_SIZE; j++) {
+         assert(quad->input.coverage[j] >= 0.0);
+         assert(quad->input.coverage[j] <= 1.0);
+         quadColor[3][j] *= quad->input.coverage[j];
+      }
+   }
+}
+
+
+/**
+ * Shade/write an array of quads
+ * Called via quad_stage::run()
+ */
+static void
+shade_quads(struct quad_stage *qs, 
+            struct quad_header *quads[],
+            unsigned nr)
+{
+   struct softpipe_context *softpipe = qs->softpipe;
+   struct tgsi_exec_machine *machine = softpipe->fs_machine;
+   unsigned i, pass = 0;
+
+   for (i = 0; i < PIPE_MAX_CONSTANT_BUFFERS; i++) {
+      machine->Consts[i] = softpipe->mapped_constants[PIPE_SHADER_FRAGMENT][i];
+   }
+   machine->InterpCoefs = quads[0]->coef;
+
+   for (i = 0; i < nr; i++) {
+      if (!shade_quad(qs, quads[i]))
+         continue; /* quad totally culled/killed */
+
+      if (/*do_coverage*/ 0)
+         coverage_quad( qs, quads[i] );
+
+      quads[pass++] = quads[i];
+   }
+   
+   if (pass)
+      qs->next->run(qs->next, quads, pass);
+}
+   
+
+/**
+ * Per-primitive (or per-begin?) setup
+ */
+static void
+shade_begin(struct quad_stage *qs)
+{
+   struct softpipe_context *softpipe = qs->softpipe;
+
+   softpipe->fs->prepare( softpipe->fs, 
+			  softpipe->fs_machine,
+			  (struct tgsi_sampler **)
+                             softpipe->tgsi.frag_samplers_list );
+
+   qs->next->begin(qs->next);
+}
+
+
+static void
+shade_destroy(struct quad_stage *qs)
+{
+   FREE( qs );
+}
+
+
+struct quad_stage *
+sp_quad_shade_stage( struct softpipe_context *softpipe )
+{
+   struct quad_shade_stage *qss = CALLOC_STRUCT(quad_shade_stage);
+   if (!qss)
+      goto fail;
+
+   qss->stage.softpipe = softpipe;
+   qss->stage.begin = shade_begin;
+   qss->stage.run = shade_quads;
+   qss->stage.destroy = shade_destroy;
+
+   return &qss->stage;
+
+fail:
+   FREE(qss);
+   return NULL;
+}