Question

事先，很抱歉发布了很多代码。我会尽量做到尽可能简单。

我的纹理是bmp格式的4x4纹理图像（如果有人对此感兴趣的是 - ＆gt; ）。并且作为映射的结果，我得到左上像素的颜色（0.0,1.0）（我检查它，它总是左上角像素的颜色），我的三角形颜色导致该像素的颜色，即白色。我尝试在GL_NEAREST

中将GL_LINEAR更改为GL_TEXTURE_MAG_FILTER

glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

我得到右下角的像素（1.0,0.0），这是某种绿色：我使用 stb_image 加载纹理。所以在我的 Texture.cpp ：

中

Texture::Texture(const std::string& fileName)
{
    int width, height, numComponents;
    unsigned char* imageData = stbi_load(fileName.c_str(), &width, &height, &numComponents, 4);
    if (imageData == NULL)
    {
        std::cerr << "Error: Texture load failed for texture: " << fileName << std::endl;
    }

    glEnable(GL_TEXTURE_2D);
    glGenTextures(1, &_texture);

    glBindTexture(GL_TEXTURE_2D, _texture);

    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, imageData);

    stbi_image_free(imageData);
}
Texture::~Texture(void)
{
    glDeleteTextures(1, &_texture);
}

void Texture::Bind(unsigned int unit)
{
    assert(unit >= 0 && unit <= 31);
    glActiveTexture(GL_TEXTURE0 + unit);
    glBindTexture(GL_TEXTURE_2D, _texture);
}

在我的顶点着色器：

中

#version 150

in vec3 position;
in vec2 texCoord;

out vec2 texCoord0;

void main(void)
{
    texCoord0 = texCoord;
    gl_Position = vec4(position, 1.0);
}

在我的片段着色器：

中

#version 150

in vec2 textCoord0;
uniform sampler2D texture;

void main(void)
{
    gl_FragColor = texture2D(texture, textCoord0);
}

在我的 main.cpp

中

#include <iostream>
#include <GL/glew.h>
#include "Display.h"
#include "Shader.h"
#include "Mesh.h"
#include "Texture.h"
int main(int argc, char** argv)
{
    Display display(800, 600, " ");
    display.Clear(0.0f, 0.15f, 0.3f, 1.0f);
    Vertex vertices[] = {
                            Vertex(glm::vec3(-1.0f, -1.0f, 0.0f), glm::vec2(0.0f, 0.0f)),
                            Vertex(glm::vec3( 0.0f,  1.0f, 0.0f), glm::vec2(0.5f, 1.0f)),
                            Vertex(glm::vec3( 1.0f, -1.0f, 0.0f), glm::vec2(1.0f, 0.0f))
    };
    Texture texture("./res/a.bmp");
    Shader shader("./res/testShader");
    Mesh mesh(vertices, sizeof(vertices) / sizeof(vertices[0]));
    while (display.IsClosed() != true)
    {
        shader.Bind();
        texture.Bind(0);
        mesh.Draw();
        display.Update();
    }
    return 0;
}

在 Mesh.cpp 中，我将顶点属性（glm :: vec3 _position和glm :: vec2 _texture）拆分为2个stl向量并使用2个缓冲区（＆＃34; 0＆＃34; - 对于顶点的位置和＆＃34; 1＆＃34; - 对于纹理）：

Mesh::Mesh(Vertex* vertices, unsigned int numVertices, GLenum usage)
{
    _drawCount = numVertices;

    glGenVertexArrays(1, &_vertexArrayObject);

    glBindVertexArray(_vertexArrayObject);

    std::vector<glm::vec3> positions;
    std::vector<glm::vec2> texCoords;

    positions.reserve(numVertices);
    texCoords.reserve(numVertices);

    for (unsigned int i = 0; i < numVertices; ++i)
    {
        positions.push_back(*vertices[i].Position());
        texCoords.push_back(*vertices[i].TexCoord());
    }
    glGenBuffers(NUM_BUFFERS, _vertexArrayBuffers);


    glBindBuffer(GL_ARRAY_BUFFER, _vertexArrayBuffers[POSITION_VB]);
    glBufferData(GL_ARRAY_BUFFER, numVertices * sizeof(positions[0]), positions.data(), usage);

    glEnableVertexAttribArray(0);
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);


    glBindBuffer(GL_ARRAY_BUFFER, _vertexArrayBuffers[TEXCOORD_VB]);
    glBufferData(GL_ARRAY_BUFFER, numVertices * sizeof(texCoords[0]), texCoords.data(), usage);

    glEnableVertexAttribArray(1);
    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, 0);


    glBindVertexArray(0);
}


Mesh::~Mesh(void)
{
    glDeleteVertexArrays(1, &_vertexArrayObject);
}

void Mesh::Draw(GLenum mode)
{
    glBindVertexArray(_vertexArrayObject);
    glDrawArrays(mode, 0, _drawCount);
    glBindVertexArray(0);
}

在 Shader.cpp 中，我绑定了这样的属性：

glBindAttribLocation(_program, 0, "position");
glBindAttribLocation(_program, 1, "texCoord");

---------------------------- EDIT ------------------ --------------- 将顶点着色器更改为：

#version 330 core

layout (location = 0) in vec3 position;
layout (location = 1) in vec2 texCoord;

out vec2 TexCoord;

void main()
{
    gl_Position = vec4(position, 1.0f);
    TexCoord = texCoord;
}

和片段着色器：

#version 330 core
in vec2 TexCoord;

out vec4 color;

uniform sampler2D ourTexture;

void main()
{
    color = texture(ourTexture, TexCoord);
}

纹理正确映射。

但我仍然想知道为什么我的第一个解决方案无效。

Answer 1

但我仍然想知道为什么我的第一个解决方案无效。

因为您正在使用

    [HttpPost]
    public ActionResult Edit()
    {
        try
        {
            businessLayer.Edit( /* some parameters */)
            return Ok();
        }
         catch(BadAcctionException)
        {
            TempData[Error] = "Bad business operation";
            return BadBusinessAction();
        }
        catch(ApplicationException ex)
        {
            TempData[Error] = ex.Message;
            return Fail();
        }
    }

自版本

#version 330 core

以来

且texture2D 已弃用

着色器编译器应该对此发出警告或错误。通过glGetShaderInfoLog和glGetProgramInfoLog检查着色器日志。

纹理映射导致纹理的1个像素的纯色

1 个答案: