OpenGL ES 2.0 - 在顶点着色器中找不到属性
我已经寻找这个问题的答案一段时间了 - 但我运气不佳。 我想做的就是将普通数据传递到顶点着色器中。位置正确传递，但是在尝试加载着色器时收到“未找到正常属性”错误。
我的 ATTRIB 值是枚举。
我已经在 OpenGL ES 2.0 中为 Iphone 开发创建了一个立方体。
我的 Shader.vsh 看起来像这样：
attribute vec4 normal;
attribute vec4 position;
varying vec4 colorVarying;
uniform mat4 mvp_matrix;
void main()
{
//Trasform the vertex
gl_Position = mvp_matrix * position;
colorVarying = vec4(1.0, 1.0, 0.0, 0.0);
}
我在绘图框架中更新属性值的部分看起来像这样：
// Update attribute values.
glVertexAttribPointer(ATTRIB_VERTEX, 3, GL_FLOAT, 0, 0, cubeVerticesStrip);
glEnableVertexAttribArray(ATTRIB_VERTEX);
glVertexAttribPointer(ATTRIB_NORMAL, 3, GL_FLOAT, 0, 0, cubeNormalsStrip);
glEnableVertexAttribArray(ATTRIB_NORMAL);
我在 LoadShader 函数中绑定这些属性值的部分像这样：
glBindAttribLocation(program, ATTRIB_VERTEX, "position");
glBindAttribLocation(program, ATTRIB_NORMAL, "normal");
再次，该位置有效。但找不到“正常”。有什么想法吗？
I've looked for a while for an answer for this - but I'm not having much luck.
All I'm trying to do is pass my normal data into my vertex shader. Positions are passing in correctly, however I'm receiving a "normal attribute not found" error when trying to load my shaders.
My ATTRIB values are enums.
I've created a cube in OpenGL ES 2.0 for Iphone development.
My Shader.vsh looks like this:
attribute vec4 normal;
attribute vec4 position;
varying vec4 colorVarying;
uniform mat4 mvp_matrix;
void main()
{
//Trasform the vertex
gl_Position = mvp_matrix * position;
colorVarying = vec4(1.0, 1.0, 0.0, 0.0);
}
The part where I update attribute values in the drawframe looks like this:
// Update attribute values.
glVertexAttribPointer(ATTRIB_VERTEX, 3, GL_FLOAT, 0, 0, cubeVerticesStrip);
glEnableVertexAttribArray(ATTRIB_VERTEX);
glVertexAttribPointer(ATTRIB_NORMAL, 3, GL_FLOAT, 0, 0, cubeNormalsStrip);
glEnableVertexAttribArray(ATTRIB_NORMAL);
And the part where I bind these in my LoadShader function is like this:
glBindAttribLocation(program, ATTRIB_VERTEX, "position");
glBindAttribLocation(program, ATTRIB_NORMAL, "normal");
Again, the position works. But "normal" cannot be found. Any ideas?
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找不到
normal因为您的 GLSL 编译器很智能。它发现您实际上并没有使用normal执行某些操作，因此它假装它不存在以节省资源。另外，你的法线和位置应该是 vec3 的，因为你只传递了 3 个值。这不是严格要求的，但它是使您的输入和属性匹配的更好形式。
normalisn't found because your GLSL compiler was smart. It saw that you didn't actually do something withnormal, so it pretends it doesn't exist to save resources.Also, your normal and position should be
vec3's since you're only passing 3 values. This isn't strictly required, but it is better form to make your inputs and attributes match.