From 669e9bfc18d2f5e28a9c715e1a69b7637a2d9c8b Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Wed, 18 Aug 2021 17:13:25 +0300
Subject: [PATCH] Decouple the Predicate enum from OpenGL constants

---
 source/core/predicate.cpp | 16 ++++++++++++++++
 source/core/predicate.h   | 18 ++++++++++--------
 source/core/sampler.cpp   |  2 +-
 source/core/stencil.cpp   |  2 +-
 source/core/tests.cpp     |  2 +-
 5 files changed, 29 insertions(+), 11 deletions(-)

diff --git a/source/core/predicate.cpp b/source/core/predicate.cpp
index a1953733..4afc6c03 100644
--- a/source/core/predicate.cpp
+++ b/source/core/predicate.cpp
@@ -6,6 +6,22 @@ using namespace std;
 namespace Msp {
 namespace GL {
 
+GLenum get_gl_predicate(Predicate pred)
+{
+	switch(pred)
+	{
+	case NEVER: return GL_NEVER;
+	case ALWAYS: return GL_ALWAYS;
+	case LESS: return GL_LESS;
+	case LEQUAL: return GL_LEQUAL;
+	case EQUAL: return GL_EQUAL;
+	case GREATER: return GL_GREATER;
+	case GEQUAL: return GL_GEQUAL;
+	case NOTEQUAL: return GL_NOTEQUAL;
+	default: throw invalid_argument("get_gl_predicate");
+	}
+}
+
 void operator>>(const LexicalConverter &conv, Predicate &pred)
 {
 	const string &str = conv.get();
diff --git a/source/core/predicate.h b/source/core/predicate.h
index 13c22e84..c7e5991e 100644
--- a/source/core/predicate.h
+++ b/source/core/predicate.h
@@ -9,16 +9,18 @@ namespace GL {
 
 enum Predicate
 {
-	NEVER    = GL_NEVER,
-	ALWAYS   = GL_ALWAYS,
-	LESS     = GL_LESS,
-	LEQUAL   = GL_LEQUAL,
-	EQUAL    = GL_EQUAL,
-	GREATER  = GL_GREATER,
-	GEQUAL   = GL_GEQUAL,
-	NOTEQUAL = GL_NOTEQUAL
+	NEVER,
+	ALWAYS,
+	LESS,
+	LEQUAL,
+	EQUAL,
+	GREATER,
+	GEQUAL,
+	NOTEQUAL
 };
 
+GLenum get_gl_predicate(Predicate);
+
 void operator>>(const LexicalConverter &, Predicate &);
 void operator<<(LexicalConverter &, Predicate);
 
diff --git a/source/core/sampler.cpp b/source/core/sampler.cpp
index ffd77625..c810789b 100644
--- a/source/core/sampler.cpp
+++ b/source/core/sampler.cpp
@@ -53,7 +53,7 @@ void Sampler::update() const
 	{
 		glSamplerParameteri(id, GL_TEXTURE_COMPARE_MODE, (compare ? GL_COMPARE_R_TO_TEXTURE : GL_NONE));
 		if(compare)
-			glSamplerParameteri(id, GL_TEXTURE_COMPARE_FUNC, cmp_func);
+			glSamplerParameteri(id, GL_TEXTURE_COMPARE_FUNC, get_gl_predicate(cmp_func));
 	}
 
 	dirty_params = 0;
diff --git a/source/core/stencil.cpp b/source/core/stencil.cpp
index 9de8b1f0..28d59f19 100644
--- a/source/core/stencil.cpp
+++ b/source/core/stencil.cpp
@@ -5,7 +5,7 @@ namespace GL {
 
 void stencil_func(Predicate func, int ref, unsigned mask)
 {
-	glStencilFunc(func, ref, mask);
+	glStencilFunc(get_gl_predicate(func), ref, mask);
 }
 
 void stencil_op(StencilOp sfail, StencilOp dfail, StencilOp dpass)
diff --git a/source/core/tests.cpp b/source/core/tests.cpp
index 8e24bb52..e1ad5261 100644
--- a/source/core/tests.cpp
+++ b/source/core/tests.cpp
@@ -18,7 +18,7 @@ void DepthTest::bind() const
 	if(set_current(this))
 	{
 		glEnable(GL_DEPTH_TEST);
-		glDepthFunc(pred);
+		glDepthFunc(get_gl_predicate(pred));
 		glDepthMask(write);
 	}
 }
-- 
2.43.0