GLSL ES顶点着色器错误

Question

我在覆盆子上构建时遇到问题。 即使我强制使用OpenGL ES，并将GLSL版本强制为1.0 es，该着色器代码也可在其他几台计算机上使用。

#version字符串以编程方式添加到每个着色器。

顶点着色器：

#version 100
#ifdef GL_ES
precision mediump float;
precision mediump int;
#endif

#if (__VERSION__ > 120)
#define IN in
#define OUT out
#else
#define IN attribute
#define OUT varying
#endif // __VERSION

#define MAX_LIGHTS 8

struct SLight
    {
    vec3 Position;
    vec3 DiffuseColor;
    float Intensity;
    float ConstantAttenuation;
    float LinearAttenuation;
    float ExponentialAttenuation;
    float CutoffDistance;
    float CutoffIntensity;
    };
struct SMaterial
    {
    vec3 Specular, Diffuse, Ambient;
    float Shininess;
    };

uniform SLight Lights[MAX_LIGHTS];
uniform int LightCount;
uniform SMaterial Material;

struct SAmbientLight
    {
    vec3 Color;
    float Intensity;
    };

uniform mat4 ModelMatrix, ViewMatrix, MVPMatrix;
uniform SAmbientLight AmbientLight;

IN vec3 VertexPosition, VertexNormal;
IN vec2 VertexTexCoord;
IN vec4 VertexColor;

OUT vec2 PerVertex_TexCoord;
OUT vec4 PerVertex_Color;
OUT vec3 PerVertex_ViewSpaceNormal, PerVertex_ViewVector;
OUT vec4 PerVertex_LightVectors[MAX_LIGHTS];

uniform bool ColoringEnabled, TexturingEnabled, LightingEnabled;

vec4 ViewSpaceLightPositions[MAX_LIGHTS];
void main()
    {
    mat4 ObjectToViewMatrix = ViewMatrix * ModelMatrix;
    vec4 ViewSpaceCoordinate = ObjectToViewMatrix * vec4 ( VertexPosition, 1.0f );

    // Calculate normal in view-space
    PerVertex_ViewSpaceNormal = mat3 ( ObjectToViewMatrix ) * VertexNormal;

    // Calculate light position in view-space
    for ( int cont = 0; cont < LightCount; ++cont )
        ViewSpaceLightPositions[cont] = ( ViewMatrix * vec4 ( Lights[cont].Position, 1.0f ) );

    // Calculate vectors from the lights to this vertex
    for ( int cont = 0; cont < LightCount; ++cont )
        PerVertex_LightVectors[cont] = ViewSpaceLightPositions[cont] - ViewSpaceCoordinate;

    // Calculate view vector
    PerVertex_ViewVector = -ViewSpaceCoordinate.xyz;

    gl_Position = MVPMatrix * vec4 ( VertexPosition, 1.0f );
    PerVertex_TexCoord = VertexTexCoord;
    if ( ColoringEnabled )
        PerVertex_Color = VertexColor;
    }

片段着色器：

#version 100
#ifdef GL_ES
precision mediump float;
precision mediump int;
#endif

#if (__VERSION__ > 120)
#define IN in
#else
#define IN varying
#endif // __VERSION __

#if ( __VERSION__ > 330 )
#define texture2D texture
#endif

#if ( __VERSION__ >= 300 )
#define FRAG_OUTPUT FragOutput
out vec4 FragOutput;
#else
#define FRAG_OUTPUT gl_FragColor
#endif

#define MAX_LIGHTS 8

struct SLight
    {
    vec3 Position;
    vec3 DiffuseColor;
    float Intensity;
    float ConstantAttenuation;
    float LinearAttenuation;
    float ExponentialAttenuation;
    float CutoffDistance;
    float CutoffIntensity;
    };
struct SMaterial
    {
    vec3 Specular, Diffuse, Ambient;
    float Shininess;
    };

uniform SLight Lights[MAX_LIGHTS];
uniform int LightCount;
uniform SMaterial Material;

struct SAmbientLight
    {
    vec3 Color;
    float Intensity;
    };

uniform mat4 ModelMatrix, ViewMatrix, MVPMatrix;
uniform SAmbientLight AmbientLight;

IN vec2 PerVertex_TexCoord;
IN vec4 PerVertex_Color;
IN vec3 PerVertex_ViewSpaceNormal, PerVertex_ViewVector;
IN vec4 PerVertex_LightVectors[MAX_LIGHTS];

uniform bool ColoringEnabled, TexturingEnabled, LightingEnabled;
uniform sampler2D TextureSampler;

vec4 CalculateLights ( void )
    {
    vec4 LightResult;
    LightResult = vec4 ( 0.0f, 0.0f, 0.0f, 1.0f );
    vec3 N = normalize ( PerVertex_ViewSpaceNormal );
    vec3 V = normalize ( PerVertex_ViewVector );
    for ( int cont = 0; cont < LightCount; ++cont )
        {
        float Distance = length ( PerVertex_LightVectors[cont] );
        if ( Distance > Lights[cont].CutoffDistance )
            continue;

        // Normalize the incoming N, L and V vectors
        vec3 L = normalize ( PerVertex_LightVectors[cont] ).xyz;
        vec3 H = normalize ( L + V );

        // Compute the diffuse and specular components for each fragment
        vec3 diffuse = max ( dot ( N, L ), 0.0f ) * Material.Diffuse * Lights[cont].DiffuseColor /** Lights[cont].Intensity*/;
        vec3 specular = pow ( max ( dot ( N, H ), 0.0f ), Material.Shininess ) * Material.Specular;

        // Compute attenuation
        float Attenuation = Lights[cont].ConstantAttenuation + Lights[cont].LinearAttenuation * Distance + Lights[cont].ExponentialAttenuation * pow ( Distance, 2.0f );

        // Final color contribution from this light
        vec3 LightContribution = vec3 ( diffuse + specular ) / Attenuation;
        if ( length ( LightContribution ) < Lights[cont].CutoffIntensity )
            continue;
        LightResult += vec4 ( LightContribution, 1.0f );
//        LightResult += vec4 ( diffuse + specular, 1.0f );
        }
    LightResult += vec4 ( AmbientLight.Color * AmbientLight.Intensity * Material.Ambient, 1.0f );
    return LightResult;
    }

void main()
    {
    vec4 FragmentOriginalColor;
    if ( TexturingEnabled )
        FragmentOriginalColor = texture2D ( TextureSampler, PerVertex_TexCoord );
    else if ( ColoringEnabled )
        FragmentOriginalColor = PerVertex_Color;
    else
        FragmentOriginalColor = vec4 ( Material.Diffuse, 1.0f );

    if ( LightingEnabled )
        FragmentOriginalColor *= CalculateLights();
    if ( FragmentOriginalColor.a == 0.0 )
        discard;

    FRAG_OUTPUT = FragmentOriginalColor;
    }

这是我的应用程序的输出：

DEBUG: Video driver 1: RPI
DEBUG: Video driver 2: dummy
DEBUG: Current video driver: RPI
INFO: Initializing OpenGLES2
INFO: Initializing OpenGLES2
DEBUG: Reported GL version string : OpenGL ES 2.0
DEBUG: Reported GLSL version string : OpenGL ES GLSL ES 1.00
DEBUG: Parsed GLSL version 1.0 es
glGetError 0x500
glGetError 0x500
DEBUG: OpenGL version 2.0 es
DEBUG: GLSL version 1.0 es
DEBUG: Created window 0x160a960
DEBUG: GL program info log length 9
DEBUG: vertex shader ID 1 successfully compiled
DEBUG: GL program info log length 9
DEBUG: fragment shader ID 2 successfully compiled
DEBUG: Created shader program 3
DEBUG: GL program info log length 56
ERROR: Shader program 3 link error. ERROR:LEX/PARSE-1 (vertex shader, line 61) Syntax error

第61行似乎是main内部的第一行，两个矩阵相乘。 我究竟做错了什么？

Answer 1

我尝试使用PVRShaderEditor编译GLES的顶点着色器（从Power VR SDK，有用的工具来检查与GLES相关的错误，它可以像在iPhone上一样编译着色器）。

它报告三个错误：

ERROR: 0:62: 'f' : suffix for floats requires language version 300
ERROR: 0:69: 'f' : suffix for floats requires language version 300
ERROR: 0:78: 'f' : suffix for floats requires language version 300

因此，您只需要在顶点和片段着色器中将所有1.0f替换为1.0 ，就应该解决该问题，好像GLES2.0中不支持f后缀。

请注意，Pi上似乎存在一个错误，该错误会导致在程序链接时显示编译错误，而应在着色器编译时显示它们。...不知道为什么您收到的错误消息没有更详细地说明...