GLSL : Use of undeclared identifier 'gl_FragData' - macos

Question

I'm debugging a really big project shading a tree, in that project the author used glsl file to shader the tree, but I have trouble compiling the glsl file:
Here is the error log:
compile: code/trees/TreeRender/Shader/Graph40.vert.glsl
ERROR: 0:4: '' : syntax error: #version
ERROR: 0:15: 'layout' : syntax error: syntax error
the Graph40.vert.glsl:
#version 120 core //the original file use version 400
#define VERT_POSITION 0
#define VERT_NORMAL 1
#define VERT_COLOR 2
#define VERT_TEXTURE 3
uniform mat4x4 matModel;
uniform mat4x4 matView;
uniform mat4x4 matProjection;
layout(location = VERT_POSITION) in vec4 Position;
layout(location = VERT_NORMAL) in vec4 Normal;
layout(location = VERT_COLOR) in vec4 Color;
layout(location = VERT_TEXTURE) in vec4 Texture;
out vec4 VertPosition;
out vec4 VertNormal;
out vec4 VertColor;
out vec4 VertTexture;
void main()
{
VertPosition = Position;
VertNormal = Normal;
VertColor = Color;
VertTexture = Texture;
gl_Position = matProjection * matView * matModel * vec4(Position.xyz, 1);
}
Another error log:
compile: code/trees/TreeRender/Shader/Default.vert.glsl
ERROR: 0:11: 'matModel' : syntax error: syntax error
The Default.vert.glsl:
#define VERT_POSITION 0
#define VERT_NORMAL 1
#define VERT_COLOR 2
#define VERT_TEXTURE 3
uniform mat4x4 matModel;
uniform mat4x4 matView;
uniform mat4x4 matProjection;
layout(location = VERT_POSITION) in vec4 Position;
layout(location = VERT_NORMAL) in vec4 Normal;
layout(location = VERT_COLOR) in vec4 Color;
layout(location = VERT_TEXTURE) in vec4 Texture;
out vec4 VertPosition;
out vec4 VertNormal;
out vec4 VertColor;
out vec4 VertTexture;
void main()
{
VertPosition = Position;
VertNormal = Normal;
VertColor = Color;
VertTexture = Texture;
gl_Position = matProjection * matView * matModel * vec4(Position.xyz, 1);
}
I tried to google the error, but found no feasible solution.
I use mac osx, xcode 7.0, the OpenGL and glut are all default versions. Glew version is 1.13.0.
Is that because of the version not match with the original version that the author used? Because I checked the original version, he used GLEW 1.9.0 and GLUT 3.7.6.
/////update//////
The original glsl files have:
#version 400 core
but there will be an error :
ERROR: 0:4: '' : version '400' is not supported
ERROR: 0:4: '' : syntax error: #version
so I commented that line. But other errors still there.
I checked my OpenGL version, using OpenGL Extension viewer, it's 4.1 in my mac, but versions older than that are also supported and should work too. But when I change to #version 410 core, it has the same error, saying that 410 is not supported.
///////////update////////////
It turned out that the version mac supported is NOT the version my context using. I printed in my code using GL_VERSION, it's 2.1 I'm using. Now I have changed into 4.1, according to [this][1]. But there is still errors:
trees/TreeRender/Shader/DefaultDepth.frag.glsl
helloERROR: 0:20: Use of undeclared identifier 'gl_FragData'
the DefaultLight.frag.glsl:
#version 400 core
in vec4 VertPosition;
in vec4 VertNormal;
in vec4 VertColor;
in vec4 VertTexture;
uniform vec3 lightPos;
void main()
{
float moment1 = gl_FragCoord.z;
float moment2 = moment1 * moment1;
gl_FragData[0] = vec4(moment1, moment2, 0.0, 1.0);
}

Answer 1

Version 120 does not support core profiles (only OpenGL 3.2+)
Layout quallifiers are also only available in OpenGL 3.2+