mesa: add comments and change Index2D to just Index2

2 files changed, 18 insertions, 8 deletions

diff --git a/src/mesa/program/prog_instruction.h b/src/mesa/program/prog_instruction.h
index cb5beb9b00..dacbc33704 100644
--- a/src/mesa/program/prog_instruction.h
+++ b/src/mesa/program/prog_instruction.h
@@ -272,9 +272,19 @@ struct prog_src_register
     */
    GLuint Negate:4;
 
-   GLuint HasIndex2D:1;
-   GLuint RelAddr2D:1;
-   GLint Index2D:(INST_INDEX_BITS+1); /**< Extra bit here for sign bit.
+   /**
+    * Is the register two-dimensional.
+    * Two dimensional registers are of the
+    * REGISTER[index][index2] format.
+    * They are used by the geometry shaders where
+    * the first index is the index within an array
+    * and the second index is the semantic of the
+    * array, e.g. gl_PositionIn[index] would become
+    * INPUT[index][gl_PositionIn]
+    */
+   GLuint HasIndex2:1;
+   GLuint RelAddr2:1;
+   GLint Index2:(INST_INDEX_BITS+1); /**< Extra bit here for sign bit.
                                        * May be negative for relative
                                        * addressing. */
 };
diff --git a/src/mesa/program/prog_print.c b/src/mesa/program/prog_print.c
index 876b2d4618..6ab199aa02 100644
--- a/src/mesa/program/prog_print.c
+++ b/src/mesa/program/prog_print.c
@@ -266,7 +266,7 @@ arb_output_attrib_string(GLint index, GLenum progType)
 static const char *
 reg_string(gl_register_file f, GLint index, gl_prog_print_mode mode,
            GLboolean relAddr, const struct gl_program *prog,
-           GLboolean hasIndex2D, GLboolean relAddr2D, GLint index2D)
+           GLboolean hasIndex2, GLboolean relAddr2, GLint index2)
 {
    static char str[100];
    const char *addr = relAddr ? "ADDR+" : "";
@@ -276,10 +276,10 @@ reg_string(gl_register_file f, GLint index, gl_prog_print_mode mode,
    switch (mode) {
    case PROG_PRINT_DEBUG:
       sprintf(str, "%s[%s%d]", file_string(f, mode), addr, index);
-      if (hasIndex2D) {
+      if (hasIndex2) {
          int offset = strlen(str);
-         const char *addr2D = relAddr2D ? "ADDR+" : "";
-         sprintf(str+offset, "[%s%d]", addr2D, index2D);
+         const char *addr2 = relAddr2 ? "ADDR+" : "";
+         sprintf(str+offset, "[%s%d]", addr2, index2);
       }
       break;
 
@@ -516,7 +516,7 @@ fprint_src_reg(FILE *f,
 	   abs,
 	   reg_string((gl_register_file) srcReg->File,
 		      srcReg->Index, mode, srcReg->RelAddr, prog,
-                      srcReg->HasIndex2D, srcReg->RelAddr2D, srcReg->Index2D),
+                      srcReg->HasIndex2, srcReg->RelAddr2, srcReg->Index2),
 	   _mesa_swizzle_string(srcReg->Swizzle,
 				srcReg->Negate, GL_FALSE),
 	   abs);