From 0590895ea78cb3e7be25ca833bfeca5f56dc7e21 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Tue, 8 Jun 2004 15:20:23 +0000
Subject: fix parse error in sign of exponents (bug 968323)

---
 src/mesa/shader/arbprogparse.c | 43 +++++++++++++-----------------------------
 1 file changed, 13 insertions(+), 30 deletions(-)

(limited to 'src/mesa/shader')

diff --git a/src/mesa/shader/arbprogparse.c b/src/mesa/shader/arbprogparse.c
index ae06444372..de449fe098 100644
--- a/src/mesa/shader/arbprogparse.c
+++ b/src/mesa/shader/arbprogparse.c
@@ -621,23 +621,23 @@ parse_string_without_adding (GLubyte ** inst, struct arb_program *Program)
 }
 
 /**
- * \return 0 if sign is plus, 1 if sign is minus
+ * \return -1 if we parse '-', return 1 otherwise
  */
-static GLuint
+static GLint
 parse_sign (GLubyte ** inst)
 {
    /*return *(*inst)++ != '+'; */
 
    if (**inst == '-') {
       (*inst)++;
-      return 1;
+      return -1;
    }
    else if (**inst == '+') {
       (*inst)++;
-      return 0;
+      return 1;
    }
 
-   return 0;
+   return 1;
 }
 
 /**
@@ -670,10 +670,7 @@ parse_integer (GLubyte ** inst, struct arb_program *Program)
     */
    Program->Position = parse_position (inst);
 
-   if (sign)
-      value *= -1;
-
-   return value;
+   return value * sign;
 }
 
 /**
@@ -685,9 +682,6 @@ parse_float (GLubyte ** inst, struct arb_program *Program)
    GLuint leading_zeros =0;
    GLfloat value = 0;
 
-#if 0
-   tmp[0] = parse_sign (inst);  /* This is the sign of the number + - >0, - -> 1 */
-#endif
    tmp[1] = parse_integer (inst, Program);   /* This is the integer portion of the number */
 
    /* Now we grab the fractional portion of the number (the digits after
@@ -709,10 +703,7 @@ parse_float (GLubyte ** inst, struct arb_program *Program)
       denom *= 10;
    denom *= (GLint) _mesa_pow( 10, leading_zeros );
    value += (GLfloat) tmp[2] / (GLfloat) denom;
-#if 0
-   if (tmp[0])
-      value *= -1;
-#endif
+
    value *= (GLfloat) _mesa_pow (10, (GLfloat) tmp[3] * (GLfloat) tmp[4]);
 
    return value;
@@ -724,17 +715,9 @@ parse_float (GLubyte ** inst, struct arb_program *Program)
 static GLfloat
 parse_signed_float (GLubyte ** inst, struct arb_program *Program)
 {
-   GLint negate;
-   GLfloat value;
-
-   negate = parse_sign (inst);
-
-   value = parse_float (inst, Program);
-
-   if (negate)
-      value *= -1;
-
-   return value;
+   GLint sign = parse_sign (inst);
+   GLfloat value = parse_float (inst, Program);
+   return value * sign;
 }
 
 /**
@@ -2405,7 +2388,7 @@ parse_extended_swizzle_mask (GLubyte ** inst, GLubyte * mask, GLboolean * Negate
 
    *Negate = GL_FALSE;
    for (a = 0; a < 4; a++) {
-      if (parse_sign (inst))
+      if (parse_sign (inst) == -1)
          *Negate = GL_TRUE;
 
       swz = *(*inst)++;
@@ -2614,7 +2597,7 @@ parse_vector_src_reg (GLcontext * ctx, GLubyte ** inst,
                       GLubyte * Swizzle, GLboolean *IsRelOffset)
 {
    /* Grab the sign */
-   *Negate = parse_sign (inst);
+   *Negate = (parse_sign (inst) == -1);
 
    /* And the src reg */
    if (parse_src_reg (ctx, inst, vc_head, Program, File, Index, IsRelOffset))
@@ -2635,7 +2618,7 @@ parse_scalar_src_reg (GLcontext * ctx, GLubyte ** inst,
                       GLubyte * Swizzle, GLboolean *IsRelOffset)
 {
    /* Grab the sign */
-   *Negate = parse_sign (inst);
+   *Negate = (parse_sign (inst) == -1);
 
    /* And the src reg */
    if (parse_src_reg (ctx, inst, vc_head, Program, File, Index, IsRelOffset))
-- 
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