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, 186 insertions, 0 deletions

diff --git a/src/mesa/pipe/i915simple/i915_state_derived.c b/src/mesa/pipe/i915simple/i915_state_derived.c
new file mode 100644
index 0000000000..392ac09b40
--- /dev/null
+++ b/src/mesa/pipe/i915simple/i915_state_derived.c
@@ -0,0 +1,186 @@
+/**************************************************************************
+ * 
+ * Copyright 2003 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 "main/glheader.h"
+#include "main/macros.h"
+#include "main/enums.h"
+
+#include "vf/vf.h"
+#include "pipe/draw/draw_context.h"
+#include "i915_context.h"
+#include "i915_state.h"
+
+
+#define EMIT_ATTR( VF_ATTR, FRAG_ATTR, INTERP )			\
+do {								\
+   slot_to_vf_attr[nr_attrs] = VF_ATTR;		\
+   nr_attrs++;					\
+   attr_mask |= (1 << (VF_ATTR));				\
+} while (0)
+
+
+static const GLuint frag_to_vf[FRAG_ATTRIB_MAX] = 
+{
+   VF_ATTRIB_POS,
+   VF_ATTRIB_COLOR0,
+   VF_ATTRIB_COLOR1,
+   VF_ATTRIB_FOG,
+   VF_ATTRIB_TEX0,
+   VF_ATTRIB_TEX1,
+   VF_ATTRIB_TEX2,
+   VF_ATTRIB_TEX3,
+   VF_ATTRIB_TEX4,
+   VF_ATTRIB_TEX5,
+   VF_ATTRIB_TEX6,
+   VF_ATTRIB_TEX7,
+   VF_ATTRIB_VAR0,
+   VF_ATTRIB_VAR1,
+   VF_ATTRIB_VAR2,
+   VF_ATTRIB_VAR3,
+   VF_ATTRIB_VAR4,
+   VF_ATTRIB_VAR5,
+   VF_ATTRIB_VAR6,
+   VF_ATTRIB_VAR7,
+};
+
+
+/**
+ * Determine which post-transform / pre-rasterization vertex attributes
+ * we need.
+ * Derived from:  fs, setup states.
+ */
+static void calculate_vertex_layout( struct i915_context *i915 )
+{
+//   const GLbitfield inputsRead = i915->fs.inputs_read;
+   const GLbitfield inputsRead = (FRAG_ATTRIB_WPOS | FRAG_ATTRIB_COL0);
+   GLuint slot_to_vf_attr[VF_ATTRIB_MAX];
+   GLbitfield attr_mask = 0x0;
+   GLuint nr_attrs = 0;
+   GLuint i;
+
+   memset(slot_to_vf_attr, 0, sizeof(slot_to_vf_attr));
+
+
+   /* TODO - Figure out if we need to do perspective divide, etc.
+    */
+   EMIT_ATTR(VF_ATTRIB_POS, FRAG_ATTRIB_WPOS, INTERP_LINEAR);
+      
+   /* Pull in the rest of the attributes.  They are all in float4
+    * format.  Future optimizations could be to keep some attributes
+    * as fixed point or ubyte format.
+    */
+   for (i = 1; i < FRAG_ATTRIB_TEX0; i++) {
+      if (inputsRead & (1 << i)) {
+         assert(i < sizeof(frag_to_vf) / sizeof(frag_to_vf[0]));
+         if (i915->setup.flatshade
+             && (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1))
+            EMIT_ATTR(frag_to_vf[i], i, INTERP_CONSTANT);
+         else
+            EMIT_ATTR(frag_to_vf[i], i, INTERP_LINEAR);
+      }
+   }
+
+   for (i = FRAG_ATTRIB_TEX0; i < FRAG_ATTRIB_MAX; i++) {
+      if (inputsRead & (1 << i)) {
+         assert(i < sizeof(frag_to_vf) / sizeof(frag_to_vf[0]));
+         EMIT_ATTR(frag_to_vf[i], i, INTERP_PERSPECTIVE);
+      }
+   }
+
+   /* Additional attributes required for setup: Just twosided
+    * lighting.  Edgeflag is dealt with specially by setting bits in
+    * the vertex header.
+    */
+   if (i915->setup.light_twoside) {
+      if (inputsRead & FRAG_BIT_COL0) {
+	 EMIT_ATTR(VF_ATTRIB_BFC0, FRAG_ATTRIB_MAX, 0); /* XXX: mark as discarded after setup */
+      }
+	    
+      if (inputsRead & FRAG_BIT_COL1) {
+	 EMIT_ATTR(VF_ATTRIB_BFC1, FRAG_ATTRIB_MAX, 0); /* XXX: discard after setup */
+      }
+   }
+
+   /* If the attributes have changed, tell the draw module (which in turn
+    * tells the vf module) about the new vertex layout.
+    */
+   draw_set_vertex_attributes( i915->draw,
+			       slot_to_vf_attr,
+			       nr_attrs );
+}
+
+
+/**
+ * Recompute cliprect from scissor bounds, scissor enable and surface size.
+ */
+static void
+compute_cliprect(struct i915_context *sp)
+{
+   GLint surfWidth, surfHeight;
+
+   if (sp->framebuffer.num_cbufs > 0) {
+      surfWidth = sp->framebuffer.cbufs[0]->width;
+      surfHeight = sp->framebuffer.cbufs[0]->height;
+   }
+   else {
+      /* no surface? */
+      surfWidth = sp->scissor.maxx;
+      surfHeight = sp->scissor.maxy;
+   }
+
+   if (sp->setup.scissor) {
+      /* clip to scissor rect */
+      sp->cliprect.minx = MAX2(sp->scissor.minx, 0);
+      sp->cliprect.miny = MAX2(sp->scissor.miny, 0);
+      sp->cliprect.maxx = MIN2(sp->scissor.maxx, surfWidth);
+      sp->cliprect.maxy = MIN2(sp->scissor.maxy, surfHeight);
+   }
+   else {
+      /* clip to surface bounds */
+      sp->cliprect.minx = 0;
+      sp->cliprect.miny = 0;
+      sp->cliprect.maxx = surfWidth;
+      sp->cliprect.maxy = surfHeight;
+   }
+}
+
+
+/* Hopefully this will remain quite simple, otherwise need to pull in
+ * something like the state tracker mechanism.
+ */
+void i915_update_derived( struct i915_context *i915 )
+{
+   if (i915->dirty & (I915_NEW_SETUP | I915_NEW_FS))
+      calculate_vertex_layout( i915 );
+
+   if (i915->dirty & (I915_NEW_SCISSOR |
+		      I915_NEW_STENCIL |
+		      I915_NEW_FRAMEBUFFER))
+      compute_cliprect(i915);
+
+   i915->dirty = 0;
+}