[英]Can't render Skybox in OpenGL
沒有可見的天空盒,但是代碼似乎正常運行。
那就是我最終看到的:
我是OpenGL的新手,所以這可能是GL代碼的綁定或位置問題。 有關完整的代碼,您可以訪問: https : //github.com/ZigoRiloo96/Riloo_Engine
在這里,我有Skybox類:
class Skybox
{
public:
Skybox();
~Skybox();
void Draw(const glm::mat4& view, const glm::mat4& projection);
private:
unsigned int cubemapTexture;
GLuint VAO;
GLuint VBO;
Shader* shader;
GLuint loadCubemap(std::vector<std::string> faces);
};
着色器:
#version 330 core
layout (location = 0) in vec3 aPos;
out vec3 TexCoords;
uniform mat4 projection;
uniform mat4 view;
void main()
{
TexCoords = aPos;
vec4 pos = projection * view * vec4(aPos, 1.0);
gl_Position = pos.xyww;
}
#version 330 core
out vec4 FragColor;
in vec3 TexCoords;
uniform samplerCube skybox;
void main()
{
FragColor = texture(skybox, TexCoords);
}
和類實現:
Skybox::Skybox()
{
GLfloat skyboxVertices[108] =
{
// positions
-1.0f, 1.0f, -1.0f,
-1.0f, -1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
1.0f, 1.0f, -1.0f,
-1.0f, 1.0f, -1.0f,
-1.0f, -1.0f, 1.0f,
-1.0f, -1.0f, -1.0f,
-1.0f, 1.0f, -1.0f,
-1.0f, 1.0f, -1.0f,
-1.0f, 1.0f, 1.0f,
-1.0f, -1.0f, 1.0f,
1.0f, -1.0f, -1.0f,
1.0f, -1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
1.0f, 1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
-1.0f, -1.0f, 1.0f,
-1.0f, 1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
1.0f, -1.0f, 1.0f,
-1.0f, -1.0f, 1.0f,
-1.0f, 1.0f, -1.0f,
1.0f, 1.0f, -1.0f,
1.0f, 1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
-1.0f, 1.0f, 1.0f,
-1.0f, 1.0f, -1.0f,
-1.0f, -1.0f, -1.0f,
-1.0f, -1.0f, 1.0f,
1.0f, -1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
-1.0f, -1.0f, 1.0f,
1.0f, -1.0f, 1.0f
};
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
glBindVertexArray(VAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(skyboxVertices), &skyboxVertices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
std::vector<std::string> faces
{
"Resources/skybox/right.jpg",
"Resources/skybox/left.jpg",
"Resources/skybox/top.jpg",
"Resources/skybox/bottom.jpg",
"Resources/skybox/front.jpg",
"Resources/skybox/back.jpg"
};
cubemapTexture = loadCubemap(faces);
shader = new Shader("Resources/Shaders/skybox.vp", "Resources/Shaders/skybox.frag");
shader->Use();
shader->setInt("skybox", 0);
}
Skybox::~Skybox()
{
}
void Skybox::Draw(const glm::mat4& view, const glm::mat4& projection)
{
glDepthFunc(GL_LEQUAL);
shader->Use();
shader->setMat4("view", glm::mat4(glm::mat3(view)));
shader->setMat4("projection", projection);
// skybox cube
glBindVertexArray(VAO);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_CUBE_MAP, cubemapTexture);
glDrawArrays(GL_TRIANGLES, 0, 36);
glBindVertexArray(0);
glDepthFunc(GL_LESS);
}
GLuint Skybox::loadCubemap(std::vector<std::string> faces)
{
unsigned int textureID;
glGenTextures(1, &textureID);
glBindTexture(GL_TEXTURE_CUBE_MAP, textureID);
int width, height, nrChannels;
for (unsigned int i = 0; i < faces.size(); i++)
{
unsigned char *data = stbi_load(faces[i].c_str(), &width, &height, &nrChannels, 0);
if (data)
{
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
stbi_image_free(data);
}
else
{
printf("Stb can't load this sh*t: %s\n", faces[i].c_str());
stbi_image_free(data);
}
}
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
return textureID;
}
感謝大家的幫助,但我犯了一個愚蠢的錯誤。 在用普通立方體渲染了天空盒之后,我明白了問題所在。 這是我將矩陣設置為着色器的功能(他就是這個混蛋):
void Shader::setMat4(const char* char_s, const glm::mat4& mat)
{
glUniformMatrix4fv(glGetUniformLocation(Program, "projection"), 1, GL_FALSE, glm::value_ptr(mat));
}
解決方案是用char_s替換“ projection” 。
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