Opengl glGetUniformLocation在使用时在变换反馈期间返回-1
该函数返回-1,即使在顶点着色器中定义并使用了Uniform,我怀疑原因可能是out属性可能没有与目标缓冲区正确绑定(不确定是否是这种情况)。如果没有这一套,我的大部分价值观将保持不变 绘制变换反馈Opengl glGetUniformLocation在使用时在变换反馈期间返回-1,opengl,glsl,transform-feedback,Opengl,Glsl,Transform Feedback,该函数返回-1,即使在顶点着色器中定义并使用了Uniform,我怀疑原因可能是out属性可能没有与目标缓冲区正确绑定(不确定是否是这种情况)。如果没有这一套,我的大部分价值观将保持不变 绘制变换反馈 /*code included in update*/ glUseProgram(feedbackShader->GetProgram()); glEnable(GL_RASTERIZER_DISCARD); /*end of code included in update*/ glBin
/*code included in update*/
glUseProgram(feedbackShader->GetProgram());
glEnable(GL_RASTERIZER_DISCARD);
/*end of code included in update*/
glBindBuffer(GL_ARRAY_BUFFER, particleBuffer[isEvenBuffer]);
glBindTransformFeedback(GL_TRANSFORM_FEEDBACK, transformBuffer[!isEvenBuffer]);
glEnableVertexAttribArray(0);
glEnableVertexAttribArray(1);
glEnableVertexAttribArray(2);
glEnableVertexAttribArray(3);
glEnableVertexAttribArray(4);
glEnableVertexAttribArray(5);
glVertexAttribPointer(5, 3, GL_FLOAT, GL_FALSE, sizeof(Particle), 0); //Location
glVertexAttribPointer(4, 3, GL_FLOAT, GL_FALSE, sizeof(Particle), (const GLvoid*)12); //Velocity
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Particle), (const GLvoid*)24); //InitLocation
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Particle), (const GLvoid*)36); //InitVelocity
glVertexAttribPointer(3, 1, GL_FLOAT, GL_FALSE, sizeof(Particle), (const GLvoid*)48); //Lifetime
glVertexAttribPointer(2, 1, GL_FLOAT, GL_FALSE, sizeof(Particle), (const GLvoid*)52); //InitLifetime
GLint uniformLocation = glGetUniformLocation(feedbackShader->GetProgram(), "time");
glUniform1f(uniformLocation, msec);
glBeginTransformFeedback(GL_POINTS);
glDrawTransformFeedback(GL_POINTS, transformBuffer[isEvenBuffer]);
glEndTransformFeedback();
glDisableVertexAttribArray(0);
glDisableVertexAttribArray(1);
glDisableVertexAttribArray(2);
glDisableVertexAttribArray(3);
glDisableVertexAttribArray(4);
glDisableVertexAttribArray(5);
顶点着色器
#version 410
in vec3 inLocation;
in vec3 inVelocity;
in vec3 inInitLocation;
in vec3 inInitVelocity;
in float inLifeTime;
in float inInitlifeTime;
out vec3 outLocation;
out vec3 outVelocity;
out vec3 outInitLocation;
out vec3 outInitVelocity;
out float outLifeTime;
out float outInitlifeTime;
uniform float time;
vec3 Gravity = vec3(0.0f,-0.98f,0.0f);
float dampeningFactor = 0.5;
void main()
{
outLifeTime = inLifeTime - time;
if(outLifeTime > 0.0f){
outVelocity = (inVelocity + Gravity * time) * dampeningFactor;
outLocation = inLocation + inVelocity * time;
}else{
outVelocity = inInitVelocity;
outLocation = inInitLocation;
outLifeTime = inInitlifeTime;
}
outInitVelocity = inInitVelocity;
outInitLocation = inInitLocation;
outInitlifeTime = inInitlifeTime;
}
#version 410
in vec3 inLocation;
in vec3 inVelocity;
in vec3 inInitLocation;
in vec3 inInitVelocity;
in float inLifeTime;
in float inInitlifeTime;
out vec3 outLocation;
out vec3 outVelocity;
out vec3 outInitLocation;
out vec3 outInitVelocity;
out float outLifeTime;
out float outInitlifeTime;
uniform float time;
vec3 Gravity = vec3(0.0f,-0.98f,0.0f);
float dampeningFactor = 0.5;
void main()
{
outLifeTime = inLifeTime - time;
if(outLifeTime > 0.0f){
outVelocity = (inVelocity + Gravity * time) * dampeningFactor;
outLocation = inLocation + inVelocity * time;
}else{
outVelocity = inInitVelocity;
outLocation = inInitLocation;
outLifeTime = inInitlifeTime;
}
outInitVelocity = inInitVelocity;
outInitLocation = inInitLocation;
outInitlifeTime = inInitlifeTime;
}
更新
你们都要求提供一些额外的信息
顶点着色器
#version 410
in vec3 inLocation;
in vec3 inVelocity;
in vec3 inInitLocation;
in vec3 inInitVelocity;
in float inLifeTime;
in float inInitlifeTime;
out vec3 outLocation;
out vec3 outVelocity;
out vec3 outInitLocation;
out vec3 outInitVelocity;
out float outLifeTime;
out float outInitlifeTime;
uniform float time;
vec3 Gravity = vec3(0.0f,-0.98f,0.0f);
float dampeningFactor = 0.5;
void main()
{
outLifeTime = inLifeTime - time;
if(outLifeTime > 0.0f){
outVelocity = (inVelocity + Gravity * time) * dampeningFactor;
outLocation = inLocation + inVelocity * time;
}else{
outVelocity = inInitVelocity;
outLocation = inInitLocation;
outLifeTime = inInitlifeTime;
}
outInitVelocity = inInitVelocity;
outInitLocation = inInitLocation;
outInitlifeTime = inInitlifeTime;
}
#version 410
in vec3 inLocation;
in vec3 inVelocity;
in vec3 inInitLocation;
in vec3 inInitVelocity;
in float inLifeTime;
in float inInitlifeTime;
out vec3 outLocation;
out vec3 outVelocity;
out vec3 outInitLocation;
out vec3 outInitVelocity;
out float outLifeTime;
out float outInitlifeTime;
uniform float time;
vec3 Gravity = vec3(0.0f,-0.98f,0.0f);
float dampeningFactor = 0.5;
void main()
{
outLifeTime = inLifeTime - time;
if(outLifeTime > 0.0f){
outVelocity = (inVelocity + Gravity * time) * dampeningFactor;
outLocation = inLocation + inVelocity * time;
}else{
outVelocity = inInitVelocity;
outLocation = inInitLocation;
outLifeTime = inInitlifeTime;
}
outInitVelocity = inInitVelocity;
outInitLocation = inInitLocation;
outInitlifeTime = inInitlifeTime;
}
反馈不一致(我很愚蠢,一开始没有这个,尽管我的代码中仍然存在同样的问题)
我还在“绘制变换反馈部分”中添加了gluseProgram
feedbackShader->LinkProgram()
链接程序。但是在链接程序之前,必须指定不同的变换反馈变量
看
活动资源列表的顺序取决于所有应用程序的实现
除了变换、反馈之外的接口。如果
使用TransformFeedbackVaryings
命令指定TRANSFORM\u FEEDBACK\u变量接口,活动资源列表将按照上次调用LinkProgram
之前最近调用TransformFeedbackVaryings
时指定的变量顺序排列
这意味着,首先必须将已编译的顶点着色器对象附加到程序对象()。然后您必须指定变换反馈变量()。最后,您必须链接程序():
此外,我建议使用定义vertex shaser输入输出变量的属性索引 e、 g
另一种选择是,属性索引可以在链接程序后通过确定,也可以在链接程序前通过设置。这是一个变换反馈,因此不存在碎片着色器。是否在调用
glUniform1f
之前的某个地方调用glUseProgram
?我在你的代码中看不到它…你应该绑定你的着色器,例如glUseProgram(feedbackShader->GetProgram())
在获得统一之前,GLint uniformLocation=glGetUniformLocation(feedbackShader->GetProgram(),“time”)代码>@rabbi76反馈hader变量明确表示程序已链接。它不需要再次链接,他可以通过绑定着色器/使用程序简单地获得位置id@Rabbid76我明白你的观点,在这种情况下,OP应该包括其着色器的细节,然后让我们看到实现细节并从那里开始
layout (location = 0) in vec3 inLocation;
layout (location = 1) in vec3 inVelocity;
layout (location = 2) in vec3 inInitLocation;
layout (location = 3) in vec3 inInitVelocity;
layout (location = 4) in float inLifeTime;
layout (location = 5) in float inInitlifeTime;