From ff4daae11db0ab811cac66e262d289a4107bba4a Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Wed, 27 Dec 2017 23:48:41 +0100
Subject: Add uniform (shader global variable)

---
 src/RenderBackend/OpenGL/ShaderProgram.cpp | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'src/RenderBackend/OpenGL/ShaderProgram.cpp')

diff --git a/src/RenderBackend/OpenGL/ShaderProgram.cpp b/src/RenderBackend/OpenGL/ShaderProgram.cpp
index 40f5b6c..aceda3b 100644
--- a/src/RenderBackend/OpenGL/ShaderProgram.cpp
+++ b/src/RenderBackend/OpenGL/ShaderProgram.cpp
@@ -12,6 +12,12 @@ namespace amalgine
         
     }
     
+    ShaderProgramNonExistingGlobalVariable::ShaderProgramNonExistingGlobalVariable(const char *variableName) : 
+        runtime_error(string("There is no shader global variable with the name '") + variableName + "'")
+    {
+        
+    }
+    
     ShaderProgram::ShaderProgram() : built(false)
     {
         shaderProgramId = glCreateProgram();
@@ -84,4 +90,19 @@ namespace amalgine
             throw ShaderProgramUsedBeforeBuilt();
         }
     }
+    
+    ShaderProgramGlobalVec3 ShaderProgram::getGlobalVec3(const char *name)
+    {
+        if(built)
+        {
+            GLint uniformId = glGetUniformLocation(shaderProgramId, name);
+            if(uniformId == -1)
+                throw ShaderProgramNonExistingGlobalVariable(name);
+            return ShaderProgramGlobalVec3(this, uniformId);
+        }
+        else
+        {
+            throw ShaderProgramUsedBeforeBuilt();
+        }
+    }
 }
-- 
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