C++ 如何将矩阵数组更新为glsl着色器

我目前正在处理骨骼动画，我真的很快就能让它工作了。目前，我有一个结构，它的矩阵有100个点（这样我最多可以有100个关节），如下所示：

struct skelShader {

glm::mat4 currentJointTrans[100];

};

结构应该绑定在着色器中，我是这样做的：

    glGenBuffers(1, &sksBuff);
glBindBuffer(GL_UNIFORM_BUFFER, sksBuff);
// bind buffer to work further with it...
// allocate memory for the buffer in the GPU
glBufferData(GL_UNIFORM_BUFFER, sizeof(skelShader), NULL, GL_STATIC_DRAW);
// because we hard-coded "binding=3" in the shader code we can do this:
// bind Uniform Buffer to binding point 3 (without caring about index of UBO)
glBindBufferBase(GL_UNIFORM_BUFFER, 4, sksBuff);
// good practice, unbind buffer
glBindBuffer(GL_UNIFORM_BUFFER, 0);

    for (int i = 0; i < skeleton.size(); i++) {

    globalSkelInfo.currentJointTrans[i] = skeleton[i]->transformMat[currentFrame - 1] * skeleton[i]->globalBindPosMat;

}

#version 440

const int maxJoints = 100;
const int maxWeights = 4;

layout(location = 0) in vec3 vertex_position;
layout(location = 1) in vec2 vertex_UV;
layout(location = 2) in vec3 vertex_normal;

layout(location = 3) in vec4 vertex_weight;
layout(location = 4) in ivec4 vertex_controllers;


out vec2 outUVs;
out vec3 outNorm;

layout(binding = 3 , std140) uniform uniformBlock
{
    vec3 camPos;
    mat4 world;
    mat4 LookAt;
    mat4 projection;
    mat4 MVP;
};

layout(binding = 4 , std140) uniform animationStruct
{
    mat4 currentJointTrans[maxJoints];
};

void main() {


vec4 finalModelPos = vec4(0.0);
vec4 finalNormal = vec4(0.0);

for (int i = 0; i < 4; i++) {

    mat4 jointTrans = currentJointTrans[vertex_controllers[i]];
    vec4 posePos = jointTrans * vec4(vertex_position, 1.0);
    finalModelPos += posePos * vertex_weight[i];

    vec4 worldNormal = jointTrans * vec4(vertex_normal, 0.0);
    finalNormal += worldNormal * vertex_weight[i];

}

gl_Position = MVP * finalModelPos;
outNorm = finalNormal.xyz;

outUVs = vertex_UV;
}

sksBuff只是一个胶点

我在每个经过的渲染/帧中用新值填充该数组，这些值是关节的新变换。我是这样做的：

    glGenBuffers(1, &sksBuff);
glBindBuffer(GL_UNIFORM_BUFFER, sksBuff);
// bind buffer to work further with it...
// allocate memory for the buffer in the GPU
glBufferData(GL_UNIFORM_BUFFER, sizeof(skelShader), NULL, GL_STATIC_DRAW);
// because we hard-coded "binding=3" in the shader code we can do this:
// bind Uniform Buffer to binding point 3 (without caring about index of UBO)
glBindBufferBase(GL_UNIFORM_BUFFER, 4, sksBuff);
// good practice, unbind buffer
glBindBuffer(GL_UNIFORM_BUFFER, 0);

    for (int i = 0; i < skeleton.size(); i++) {

    globalSkelInfo.currentJointTrans[i] = skeleton[i]->transformMat[currentFrame - 1] * skeleton[i]->globalBindPosMat;

}

#version 440

const int maxJoints = 100;
const int maxWeights = 4;

layout(location = 0) in vec3 vertex_position;
layout(location = 1) in vec2 vertex_UV;
layout(location = 2) in vec3 vertex_normal;

layout(location = 3) in vec4 vertex_weight;
layout(location = 4) in ivec4 vertex_controllers;


out vec2 outUVs;
out vec3 outNorm;

layout(binding = 3 , std140) uniform uniformBlock
{
    vec3 camPos;
    mat4 world;
    mat4 LookAt;
    mat4 projection;
    mat4 MVP;
};

layout(binding = 4 , std140) uniform animationStruct
{
    mat4 currentJointTrans[maxJoints];
};

void main() {


vec4 finalModelPos = vec4(0.0);
vec4 finalNormal = vec4(0.0);

for (int i = 0; i < 4; i++) {

    mat4 jointTrans = currentJointTrans[vertex_controllers[i]];
    vec4 posePos = jointTrans * vec4(vertex_position, 1.0);
    finalModelPos += posePos * vertex_weight[i];

    vec4 worldNormal = jointTrans * vec4(vertex_normal, 0.0);
    finalNormal += worldNormal * vertex_weight[i];

}

gl_Position = MVP * finalModelPos;
outNorm = finalNormal.xyz;

outUVs = vertex_UV;
}

for（int i=0；itransformMat[currentFrame-1]*骨架[i]>globalBindPosMat；
}

这对根关节正常工作，但其余关节/网格仍保持绑定姿势。问题应该在我更新阵列的地方。目前，在完成每个关节的乘法后，我在渲染函数中这样做：

    for (int i = 0; i < skeleton.size(); i++) {
    glUniformMatrix4fv(glGetUniformLocation(aShaderProgram, ("currentJointTrans[" + std::to_string(i) + "]").c_str()),
        1, GL_FALSE, glm::value_ptr(globalSkelInfo.currentJointTrans[i]));
}

for（int i=0；i

在这之后我画画。根关节值似乎正确移动，但网格的其余部分处于bindpose且不移动。在顶点着色器中，我尝试如下更新矩阵：

    glGenBuffers(1, &sksBuff);
glBindBuffer(GL_UNIFORM_BUFFER, sksBuff);
// bind buffer to work further with it...
// allocate memory for the buffer in the GPU
glBufferData(GL_UNIFORM_BUFFER, sizeof(skelShader), NULL, GL_STATIC_DRAW);
// because we hard-coded "binding=3" in the shader code we can do this:
// bind Uniform Buffer to binding point 3 (without caring about index of UBO)
glBindBufferBase(GL_UNIFORM_BUFFER, 4, sksBuff);
// good practice, unbind buffer
glBindBuffer(GL_UNIFORM_BUFFER, 0);

    for (int i = 0; i < skeleton.size(); i++) {

    globalSkelInfo.currentJointTrans[i] = skeleton[i]->transformMat[currentFrame - 1] * skeleton[i]->globalBindPosMat;

}

#version 440

const int maxJoints = 100;
const int maxWeights = 4;

layout(location = 0) in vec3 vertex_position;
layout(location = 1) in vec2 vertex_UV;
layout(location = 2) in vec3 vertex_normal;

layout(location = 3) in vec4 vertex_weight;
layout(location = 4) in ivec4 vertex_controllers;


out vec2 outUVs;
out vec3 outNorm;

layout(binding = 3 , std140) uniform uniformBlock
{
    vec3 camPos;
    mat4 world;
    mat4 LookAt;
    mat4 projection;
    mat4 MVP;
};

layout(binding = 4 , std140) uniform animationStruct
{
    mat4 currentJointTrans[maxJoints];
};

void main() {


vec4 finalModelPos = vec4(0.0);
vec4 finalNormal = vec4(0.0);

for (int i = 0; i < 4; i++) {

    mat4 jointTrans = currentJointTrans[vertex_controllers[i]];
    vec4 posePos = jointTrans * vec4(vertex_position, 1.0);
    finalModelPos += posePos * vertex_weight[i];

    vec4 worldNormal = jointTrans * vec4(vertex_normal, 0.0);
    finalNormal += worldNormal * vertex_weight[i];

}

gl_Position = MVP * finalModelPos;
outNorm = finalNormal.xyz;

outUVs = vertex_UV;
}

#版本440
常量int maxJoints=100；
const int maxWeights=4；
vec3顶点位置的布局（位置=0）；
vec2顶点中的布局（位置=1）；
vec3顶点_法线中的布局（位置=2）；
vec4顶点权重中的布局（位置=3）；
ivec4 vertex_控制器中的布局（位置=4）；
输出vec2输出uvs；
3例失范；
布局（装订=3，std140）统一单块
{
vec3坎波斯；
mat4世界；
mat4注视；
mat4投影；
mat4mvp；
};
布局（绑定=4，std140）统一动画结构
{
mat4 currentJointTrans[maxJoints]；
};
void main（）{
vec4最终模型=vec4（0.0）；
vec4最终正常值=vec4（0.0）；
对于（int i=0；i<4；i++）{
mat4 jointTrans=当前jointTrans[顶点控制器[i]；
vec4 posePos=jointTrans*vec4（顶点位置，1.0）；
finalModelPos+=posePos*顶点权重[i]；
vec4 worldNormal=jointTrans*vec4（顶点_法线，0.0）；
最终法线+=世界法线*顶点权重[i]；
}
gl_位置=MVP*最终模型；
outNorm=最终正常值.xyz；
outUVs=顶点_UV；
}

---

我的理论是用我的currentJointTrans数组更新struct skelShader是不正确的。有没有关于如何执行此操作的提示？

glUniform*

调用无法在中设置数据。实际上，统一缓冲区的全部要点是统一数据来自缓冲区对象。这就是为什么你必须创造一个

---

因此，如果要为统一块设置统一数据，请将该数据设置到缓冲区对象中。

谢谢您的帮助！你说的话很有用，让我更仔细地研究了一下。我这样做就解决了这个问题：

for（inti=0；I<100；I++）{glUniformMatrix4fv（glGetUniformLocation（aShaderProgram，（“currentJointTrans[“+std:：to_string（I）+“]）.c_str 1，GL_FALSE，glm:：value_ptr（currentJointTrans[I]）；glm:：mat4 test=currentJointTrans[I]}

@Haplue:这不可能解决它，因为您无法通过

glUniform

调用设置统一块数据。如果这样做有效的话，那要么是因为你停止使用统一的块体，要么是纯粹的意外。那些

glGetUniformLocation

调用中的每一个都应该返回-1。对不起，我很忙，所以我忘了提到我在glsl顶点着色器中将mat4设置为仅一个unifom mat4，没有结构之类的。最近发生了很多事情，所以我真的希望我没有忘记提及我改变的其他事情。我再次道歉，谢谢你！