Mesa (glsl2): ir_to_mesa: Add support for projected non-shadow/bias/ lod texturing.

[Eric Anholt]

Module: Mesa
Branch: glsl2
Commit: de75dfac4ea2cad64dc91f6ac16fe205b5015af6
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=de75dfac4ea2cad64dc91f6ac16fe205b5015af6

Author: Eric Anholt <eric at anholt.net>
Date:   Fri Jul  2 14:49:29 2010 -0700

ir_to_mesa: Add support for projected non-shadow/bias/lod texturing.

Fixes:
glsl-fs-texture2dproj
glsl-fs-texture2dproj-2

---

 src/mesa/shader/ir_to_mesa.cpp |   21 ++++++++++++++++++---
 1 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/src/mesa/shader/ir_to_mesa.cpp b/src/mesa/shader/ir_to_mesa.cpp
index 59268e6..96f3cd7 100644
--- a/src/mesa/shader/ir_to_mesa.cpp
+++ b/src/mesa/shader/ir_to_mesa.cpp
@@ -1287,13 +1287,18 @@ ir_to_mesa_visitor::visit(ir_call *ir)
 void
 ir_to_mesa_visitor::visit(ir_texture *ir)
 {
-   ir_to_mesa_src_reg result_src, coord;
+   ir_to_mesa_src_reg result_src, coord, projector;
    ir_to_mesa_dst_reg result_dst, lod_info;
    ir_to_mesa_instruction *inst = NULL;
 
    ir->coordinate->accept(this);
    coord = this->result;
 
+   if (ir->projector) {
+      ir->projector->accept(this);
+      projector = this->result;
+   }
+
    /* Storage for our result.  Ideally for an assignment we'd be using
     * the actual storage for the result here, instead.
     */
@@ -1302,7 +1307,16 @@ ir_to_mesa_visitor::visit(ir_texture *ir)
 
    switch (ir->op) {
    case ir_tex:
-      inst = ir_to_mesa_emit_op1(ir, OPCODE_TEX, result_dst, coord);
+      if (ir->projector) {
+	 /* Compute new coord as vec4(texcoord.xyz, projector) */
+	 ir_to_mesa_emit_op1(ir, OPCODE_MOV, result_dst, coord);
+	 result_dst.writemask = WRITEMASK_W;
+	 ir_to_mesa_emit_op1(ir, OPCODE_MOV, result_dst, projector);
+	 result_dst.writemask = WRITEMASK_XYZW;
+	 inst = ir_to_mesa_emit_op1(ir, OPCODE_TXP, result_dst, result_src);
+      } else {
+	 inst = ir_to_mesa_emit_op1(ir, OPCODE_TEX, result_dst, coord);
+      }
       break;
    case ir_txb:
       /* Mesa IR stores bias in the last channel of the coords. */
@@ -1312,6 +1326,7 @@ ir_to_mesa_visitor::visit(ir_texture *ir)
       ir_to_mesa_emit_op1(ir, OPCODE_MOV, lod_info, this->result);
 
       inst = ir_to_mesa_emit_op1(ir, OPCODE_TXB, result_dst, coord);
+      assert(!ir->projector); /* FINISHME */
       break;
    case ir_txl:
       /* Mesa IR stores lod in the last channel of the coords. */
@@ -1321,6 +1336,7 @@ ir_to_mesa_visitor::visit(ir_texture *ir)
       ir_to_mesa_emit_op1(ir, OPCODE_MOV, lod_info, this->result);
 
       inst = ir_to_mesa_emit_op1(ir, OPCODE_TXL, result_dst, coord);
+      assert(!ir->projector); /* FINISHME */
       break;
    case ir_txd:
    case ir_txf:
@@ -1354,7 +1370,6 @@ ir_to_mesa_visitor::visit(ir_texture *ir)
       assert(!"FINISHME: other texture targets");
    }
 
-   assert(!ir->projector); /* FINISHME */
    assert(!ir->shadow_comparitor); /* FINISHME */
 
    this->result = result_src;