GLSL：使用未声明的标识符“gl_fragdata”

Question

我正在调试一个非常大的树着色项目，在该项目中，作者使用glsl文件来着色树，但我在编译glsl文件时遇到了麻烦：

以下是错误日志：

compile: code/trees/TreeRender/Shader/Graph40.vert.glsl
    ERROR: 0:4: '' : syntax error: #version
    ERROR: 0:15: 'layout' : syntax error: syntax error

 #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);
}

compile: code/trees/TreeRender/Shader/Default.vert.glsl
ERROR: 0:11: 'matModel' : syntax error: syntax error

#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);
}

我使用mac osx，Xcode7.0，OpenGL和glut都是默认版本。Glew版本是1.13.0。

这是因为版本与作者使用的原始版本不匹配吗？因为我检查了原始版本，所以他使用了GLEW 1.9.0和GLUT 3.7.6。

//////更新///////

#version 400 core 

ERROR: 0:4: '' :  version '400' is not supported
ERROR: 0:4: '' : syntax error: #version

原来mac支持的版本不是我的上下文使用的版本。我在代码中使用GL_VERSION打印，我使用的是2.1。现在我变成了4.1，根据[这][1]。但仍有错误：

trees/TreeRender/Shader/DefaultDepth.frag.glsl
helloERROR: 0:20: Use of undeclared identifier 'gl_FragData'

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

版本120不支持核心配置文件（仅OpenGL 3.2+)布局限定符也仅在OpenGL 3.2+中可用