r300: Remove all Mesa dependencies from the shader compiler

In particular, this removes the dependency on prog_instruction, which
unfortunately creates some code duplication, but also opens a path towards
adding some hardware-specific things in there.

Signed-off-by: Nicolai Hähnle <nhaehnle@gmail.com>

1 files changed, 21 insertions, 2 deletions

diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_code.h b/src/mesa/drivers/dri/r300/compiler/radeon_code.h
index 0806fb1b5c..de0c88ed51 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_code.h
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_code.h
@@ -89,6 +89,23 @@ unsigned rc_constants_add_immediate_vec4(struct rc_constant_list * c, const floa
 unsigned rc_constants_add_immediate_scalar(struct rc_constant_list * c, float data, unsigned * swizzle);
 
 /**
+ * Compare functions.
+ *
+ * \note By design, RC_COMPARE_FUNC_xxx + GL_NEVER gives you
+ * the correct GL compare function.
+ */
+typedef enum {
+	RC_COMPARE_FUNC_NEVER = 0,
+	RC_COMPARE_FUNC_LESS,
+	RC_COMPARE_FUNC_EQUAL,
+	RC_COMPARE_FUNC_LEQUAL,
+	RC_COMPARE_FUNC_GREATER,
+	RC_COMPARE_FUNC_NOTEQUAL,
+	RC_COMPARE_FUNC_GEQUAL,
+	RC_COMPARE_FUNC_ALWAYS
+} rc_compare_func;
+
+/**
  * Stores state that influences the compilation of a fragment program.
  */
 struct r300_fragment_program_external_state {
@@ -105,10 +122,12 @@ struct r300_fragment_program_external_state {
 
 		/**
 		 * If the sampler is used as a shadow sampler,
-		 * this field is (texture_compare_func - GL_NEVER).
-		 * [e.g. if compare function is GL_LEQUAL, this field is 3]
+		 * this field specifies the compare function.
+		 *
+		 * Otherwise, this field is \ref RC_COMPARE_FUNC_NEVER (aka 0).
 		 *
 		 * Otherwise, this field is 0.
+		 * \sa rc_compare_func
 		 */
 		unsigned texture_compare_func : 3;
 	} unit[16];