Fixed colors in shaders.

src/dawnopengl/display/shader/ShaderProgram.cpp

@@ -97,7 +97,8 @@ void ShaderProgram::setBoolean(shaderparameter_t uni, bool value) {
 }
 
 void ShaderProgram::setColor(shaderparameter_t uniform, struct Color color) {
-  glUniform4f(uniform, color.r, color.g, color.b, color.a);
+  auto precise = color.precision();
+  glUniform4f(uniform, precise.r, precise.g, precise.b, precise.a);
 }
 
 void ShaderProgram::setVector3(shaderparameter_t uniform, glm::vec3 vector) {