From fb170c8bd71e649807a9e86e7290c973bc34b206 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Wed, 6 Oct 2004 15:56:38 +0000
Subject: more GL_ARB_draw_buffers updates from Michale Krol

---
 src/mesa/shader/arbprogram.syn | 63 +++++++++++++++++++++++++++---------------
 1 file changed, 41 insertions(+), 22 deletions(-)

(limited to 'src/mesa/shader/arbprogram.syn')

diff --git a/src/mesa/shader/arbprogram.syn b/src/mesa/shader/arbprogram.syn
index a4e3a20222e..75db7a7942a 100644
--- a/src/mesa/shader/arbprogram.syn
+++ b/src/mesa/shader/arbprogram.syn
@@ -31,6 +31,17 @@
 /* GL_ARB_fragment_program_shadow option flags */
 .emtcode ARB_FRAGMENT_PROGRAM_SHADOW                0x40
 
+/* GL_ARB_draw_buffers option flags */
+.emtcode ARB_DRAW_BUFFERS                           0x80
+
+/* if we need more flags, we have three options:
+   1) change the existing flags to indicate an option to a shift, so 0x01 becomes 0 (because
+      1 << 0 is 0x01), 0x02 becomes 1 (1 << 1 == 0x02), and so on - this would give us
+      256 flags,
+   2) mark special value of 0 to say "the following byte will hold the upper 8 bit flags",
+   3) expand all the existing flags to be 2 bytes long
+*/
+
 /* GL_ARB_fragment_program instruction class */
 .emtcode OP_ALU_INST                                0x00
 .emtcode OP_TEX_INST                                0x01
@@ -400,6 +411,9 @@
 /* GL_ARB_fragment_program_shadow */
 .regbyte fragment_program_shadow                    0x00
 
+/* GL_ARB_draw_buffers */
+.regbyte draw_buffers                               0x00
+
 /* option presence condition registers */
 /* they are all initially set to zero - when a particular OPTION is encountered, the appropriate */
 /* register is set to 1 to indicate that the OPTION was specified. */
@@ -417,6 +431,9 @@
 /* GL_ARB_fragment_program_shadow */
 .regbyte ARB_fragment_program_shadow                0x00
 
+/* GL_ARB_draw_buffers */
+.regbyte ARB_draw_buffers                           0x00
+
 /* program target condition register */
 /* this syntax script deals with two program targets - VERTEX_PROGRAM and FRAGMENT_PROGRAM. */
 /* to distinguish between them we need a register that will store for us the current target. */
@@ -482,7 +499,9 @@ fp_optionString
     fp_ARB_fog_exp2 .emit ARB_FOG_EXP2 .load ARB_fog_exp2 0x01 .or
     fp_ARB_fog_linear .emit ARB_FOG_LINEAR .load ARB_fog_linear 0x01 .or
     .if (fragment_program_shadow != 0x00) "ARB_fragment_program_shadow"
-        .emit ARB_FRAGMENT_PROGRAM_SHADOW .load ARB_fragment_program_shadow 0x01;
+        .emit ARB_FRAGMENT_PROGRAM_SHADOW .load ARB_fragment_program_shadow 0x01 .or
+    .if (draw_buffers != 0x00) "ARB_draw_buffers" .emit ARB_DRAW_BUFFERS
+        .load ARB_draw_buffers 0x01;
 vp_optionString
     "ARB_position_invariant" .emit ARB_POSITION_INVARIANT .load ARB_position_invariant 0x01;
 fp_ARB_fog_exp
@@ -1952,7 +1971,7 @@ stateClipPlaneNum
 
 /*
 vertex program
-    <statePointItem>       ::= "point" . <statePointProperty>
+    <statePointItem>       ::= "point" "." <statePointProperty>
 */
 statePointItem
     "point" .and dot .and statePointProperty .error INVALID_POINT_PROPERTY;
@@ -1992,7 +2011,7 @@ optMatrixRows_1
     stateMatrixRowNum .and dotdot .and stateMatrixRowNum .and rbracket;
 
 /*
-    <stateMatrixItem>      ::= "matrix" . <stateMatrixName> 
+    <stateMatrixItem>      ::= "matrix" "." <stateMatrixName> 
                                <stateOptMatModifier>
 */
 stateMatrixItem
@@ -2063,23 +2082,6 @@ stateOptModMatNum_1
 stateModMatNum
     integer;
 
-/*
-    From ARB_draw_buffers:
-    <optOutputColorNum>    ::= ""
-                             | "[" <OutputColorNum> "]"
-*/
-optOutputColorNum
-    optOutputColorNum_1 .or .true .emit 0x00;
-optOutputColorNum_1
-    lbracket_ne .and outputColorNum .and rbracket;
-
-/*
-    From ARB_draw_buffers:
-    <outputColorNum>       ::= <integer> from 0 to MAX_DRAW_BUFFERS_ARB-1
-*/ 
-outputColorNum
-    integer;
-
 /*
     <optTexCoordNum>       ::= ""
                              | "[" <texCoordNum> "]"
@@ -2322,9 +2324,9 @@ vp_OUTPUT_statement
     vp_resultBinding .error RESULT_EXPECTED;
 
 /*
-      From ARB_draw_buffers:
 fragment program
-    <resultBinding>        ::= "result" "." "color" <optOutputColorNum>
+    <resultBinding>        ::= "result" "." "color"
+                             | "result" "." "color" <optOutputColorNum> (if option ARB_draw_buffers present)
                              | "result" "." "depth"
 
 vertex program
@@ -2352,6 +2354,23 @@ vp_resultBinding_1
 vp_resultBinding_2
     "texcoord" .and optTexCoordNum;
 
+/*
+GL_ARB_draw_buffers
+    <optOutputColorNum>    ::= ""
+                             | "[" <outputColorNum> "]"
+*/
+optOutputColorNum
+    .if (ARB_draw_buffers != 0x00) optOutputColorNum_1 .or .true .emit 0x00;
+optOutputColorNum_1
+    lbracket_ne .and outputColorNum .and rbracket;
+
+/*
+GL_ARB_draw_buffers
+    <outputColorNum>       ::= <integer> from 0 to MAX_DRAW_BUFFERS_ARB-1
+*/
+outputColorNum
+    integer;
+
 /*
 vertex program
     <resultColBinding>     ::= "color" <optFaceType> <optColorType>
-- 
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