fix: 8.guest.2020.oit: binding point supported since core 4.2

src/8.guest/2020/oit/composite.fs

@@ -1,4 +1,4 @@
-#version 400 core
+#version 420 core
 
 // shader outputs
 layout (location = 0) out vec4 frag;

src/8.guest/2020/oit/composite.vs

@@ -1,4 +1,4 @@
-#version 400 core
+#version 420 core
 
 // shader inputs
 layout (location = 0) in vec3 position;

src/8.guest/2020/oit/screen.fs

@@ -1,4 +1,4 @@
-#version 400 core
+#version 420 core
 
 // shader inputs
 in vec2 texture_coords;

src/8.guest/2020/oit/screen.vs

@@ -1,4 +1,4 @@
-#version 400 core
+#version 420 core
 
 // shader inputs
 layout (location = 0) in vec3 position;

src/8.guest/2020/oit/solid.fs

@@ -1,4 +1,4 @@
-#version 400 core
+#version 420 core
 
 // shader outputs
 layout (location = 0) out vec4 frag;

src/8.guest/2020/oit/solid.vs

@@ -1,4 +1,4 @@
-#version 400 core
+#version 420 core
 
 // shader inputs
 layout (location = 0) in vec3 position;

src/8.guest/2020/oit/transparent.fs

@@ -1,4 +1,4 @@
-#version 400 core
+#version 420 core
 
 // shader outputs
 layout (location = 0) out vec4 accum;

src/8.guest/2020/oit/transparent.vs

@@ -1,4 +1,4 @@
-#version 400 core
+#version 420 core
 
 // shader inputs
 layout (location = 0) in vec3 position;

src/8.guest/2020/oit/weighted_blended.cpp

@@ -36,7 +36,7 @@ int main(int argc, char* argv[])
 	// ------------------------------
 	glfwInit();
 	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
-	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
 	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
 
 	#ifdef __APPLE__