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This commit is contained in:
lenn
2026-02-11 17:50:12 +08:00
parent 1bcfb49b7a
commit 26e00f9fea
6 changed files with 202 additions and 51 deletions
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14
CMakeLists.txt
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@@ -4,6 +4,9 @@ project(3dviewer)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
include_directories(.)
find_package(glfw3 REQUIRED)
find_package(OpenGL REQUIRED)
add_executable(
${PROJECT_NAME}
main.cpp
@@ -15,5 +18,14 @@ add_executable(
target_link_libraries(
${PROJECT_NAME}
PRIVATE
libglfw3.a
glfw3
OpenGL::GL
X11
Xrandr
Xi
Xcursor
Xinerama
pthread
dl
m
)

2
camera.h
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@@ -82,6 +82,8 @@ public:
void triggleFirstMouse() { firstMouse_ = !firstMouse_; }
float Zoom() const { return zoom_; }
private:
void updateCameraVectors() {
glm::vec3 front;

26
lopenglprogram.cpp
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@@ -120,21 +120,35 @@ bool LOpenGLShader::compileShaderFromFile(const std::string &path) {
return true;
}
LOpenGLProgram::LOpenGLProgram() : linked_(false) {
Create();
}
LOpenGLProgram::LOpenGLProgram() { Create(); }
LOpenGLProgram::~LOpenGLProgram() {
if (programId_ != 0) {
glDeleteProgram(programId_);
}
}
void LOpenGLProgram::Create() { programId_ = glCreateProgram(); }
void LOpenGLProgram::Create() {
programId_ = glCreateProgram();
created_ = (programId_ != 0);
linked_ = false;
}
bool LOpenGLProgram::Link() const {
bool LOpenGLProgram::Link() {
if (!created_ || linked_ || shaderList_.empty()) {
return false;
}
glLinkProgram(programId_);
GLint success = 0;
glGetProgramiv(programId_, GL_LINK_STATUS, &success);
if (!success) {
char infoLog[512];
glGetProgramInfoLog(programId_, 512, nullptr, infoLog);
std::cout << "ERROR::PROGRAM::LINK_FAILED\n" << infoLog << std::endl;
linked_ = false;
return false;
}
linked_ = true;
return true;
}
@@ -165,7 +179,7 @@ void LOpenGLProgram::setUniformValue(const std::string &name, float x, float y,
}
void LOpenGLProgram::setUniformValue(const std::string &name, glm::mat4 value) const {
glUniform4fv(glGetUniformLocation(programId_, name.c_str()), 1, &value[0][0]);
glUniformMatrix4fv(glGetUniformLocation(programId_, name.c_str()), 1, GL_FALSE, &value[0][0]);
}
bool LOpenGLProgram::addShader(std::unique_ptr<LOpenGLShader> shader) {

8
lopenglprogram.h
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@@ -41,7 +41,7 @@ public:
bool addShader(std::unique_ptr<LOpenGLShader> shader);
void removeShader(GLuint id);
void Create();
bool Link() const;
bool Link();
void Use() const;
bool Linked() const { return linked_; }
@@ -55,7 +55,7 @@ public:
private:
std::list<std::unique_ptr<LOpenGLShader>> shaderList_;
GLuint programId_;
bool linked_;
bool created_;
GLuint programId_ = 0;
bool linked_ = false;
bool created_ = false;
};

160
main.cpp
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@@ -4,7 +4,10 @@
#include <GL/glext.h>
#include <GLFW/glfw3.h>
#include <functional>
#include <glm/ext/matrix_clip_space.hpp>
#include <glm/ext/matrix_transform.hpp>
#include <glm/fwd.hpp>
#include <glm/trigonometric.hpp>
#include <iostream>
#include <memory>
#include <utility>
@@ -17,19 +20,28 @@ public:
int width;
int height;
};
GLWidget(ViewPort port) : viewport_(port),
window_(nullptr, [](GLFWwindow* w){if(w) glfwDestroyWindow(w);}) {
GLWidget(ViewPort port) : viewport_(port)
, window_(nullptr, [](GLFWwindow* w){if(w) glfwDestroyWindow(w);})
, deinit_(false) {
lastX_ = port.width / 2;
lastY_ = port.height / 2;
initGeometry();
}
~GLWidget() {
if (!deinit_) {
// OpenGL objects should be deleted while a valid context still exists.
if (window_) {
glfwMakeContextCurrent(window_.get());
}
if (bgVao_) {
glDeleteVertexArrays(1, &bgVao_);
}
if (bgVbo_) {
glDeleteBuffers(1, &bgVbo_);
}
deinit_ = true;
}
}
void setViewPort(int width, int height) {
@@ -37,7 +49,10 @@ public:
}
bool initGeometry() {
glfwInit();
if (!glfwInit()) {
std::cout << "Failed to initialize GLFW" << std::endl;
return false;
}
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
@@ -48,18 +63,20 @@ public:
if (!window_) {
std::cout << "Failed to create GLFW window" << std::endl;
glfwTerminate();
return -1;
return false;
}
glfwMakeContextCurrent(window_.get());
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
std::cout << "Failed to initialize GLAD" << std::endl;
return -1;
return false;
}
glViewport(0, 0, 800, 600);
glfwSetWindowUserPointer(window_.get(), this);
glfwSetFramebufferSizeCallback(window_.get(), &GLWidget::framebufferSizeCallback);
glfwSetCursorPosCallback(window_.get(), &GLWidget::mouseCallback);
glfwSetScrollCallback(window_.get(), &GLWidget::scrollCallback);
return true;
}
void setBgShaderPath(std::string vp, std::string fp) {
@@ -95,16 +112,100 @@ private:
}
void initPanelGeometry_() {
if (panelVbo_) {
glDeleteBuffers(1, &panelVbo_);
panelVbo_ = 0;
}
if (panelVao_) {
glDeleteVertexArrays(1, &panelVao_);
panelVao_ = 0;
}
const float y = panelHeight_ * 0.5f;
const float x = panelWidth_ * 0.5f;
const float z = panelDepth_ * 0.5f;
struct V {
float x, y, z;
float nx, ny, nz;
};
const V verts[24] = {
// 顶面
{-x, y, -z, 0, 1, 0},
{x, y, -z, 0, 1, 0},
{x, y, z, 0, 1, 0 },
{-x, y, z, 0, 1, 0},
// 前面
{-x, y, z, 0, 0, 1},
{x, y, z, 0, 0, 1},
{x, -y, z, 0, 0, 1},
{-x, -y, z, 0, 0, 1},
// 底面
{-x, -y, -z, 0, -1, 0},
{x, -y, -z, 0, -1, 0},
{x, -y, z, 0, -1, 0},
{-x, -y, z, 0, -1, 0},
// 后面
{-x, y, -z, 0, 0, -1},
{x, y, -z, 0, 0, -1},
{x, -y, -z, 0, 0, -1},
{-x, -y, -z, 0, 0, -1},
// 左面
{-x, y, z, -1, 0, 0},
{-x, y, -z, -1, 0, 0},
{-x, -y, -z, -1, 0, 0},
{-x, -y, z, -1, 0, 0},
// 右面
{x, y, -z, 1, 0, 0},
{x, y, z, 1, 0, 0},
{x, -y, z, 1, 0, 0},
{x, -y, -z, 1, 0, 0},
};
unsigned int idx[36] = {
0, 1, 2, 0, 2, 3,
4, 5, 6, 4, 6, 7,
8, 9, 10, 8, 10, 11,
12, 13, 14, 12, 14, 15,
16, 17, 18, 16, 18, 19,
20, 21, 22, 20, 22, 23,
};
glGenVertexArrays(1, &panelVao_);
}
bool initBgProgram() {
auto vshader = std::make_unique<LOpenGLShader>(LOpenGLShader::ShaderType::Vertex);
auto fshader = std::make_unique<LOpenGLShader>(LOpenGLShader::ShaderType::Fragment);
vshader->compileShaderFromFile(bgVertShaderPath_);
fshader->compileShaderFromFile(bgFragShaderPath_);
if (!vshader->compileShaderFromFile(bgVertShaderPath_)) {
std::cout << "Vertex shader compile failed: " << bgVertShaderPath_ << "\n"
<< vshader->Log() << std::endl;
return false;
}
if (!fshader->compileShaderFromFile(bgFragShaderPath_)) {
std::cout << "Fragment shader compile failed: " << bgFragShaderPath_ << "\n"
<< fshader->Log() << std::endl;
return false;
}
bgProg_ = std::make_unique<LOpenGLProgram>();
bgProg_->addShader(std::move(vshader));
bgProg_->addShader(std::move(fshader));
if (!bgProg_->addShader(std::move(vshader))) {
std::cout << "Failed to attach vertex shader\n";
return false;
}
if (!bgProg_->addShader(std::move(fshader))) {
std::cout << "Failed to attach fragment shader\n";
return false;
}
bool ret = bgProg_->Link();
if (!ret) {
std::cout << "Failed to link background program\n";
return false;
}
@@ -119,7 +220,7 @@ private:
bgProg_->Use();
bgProg_->setUniformValue("uViewport", glm::vec2(viewport_.width, viewport_.height));
bgProg_->setUniformValue("uMajorStep", 120.0f);
bgProg_->setUniformValue("uMinjorStep", 24.0f);
bgProg_->setUniformValue("uMinorStep", 24.0f);
glBindVertexArray(bgVao_);
glDrawArrays(GL_TRIANGLES, 0, 6);
glBindVertexArray(0);
@@ -131,11 +232,20 @@ private:
public:
void eventLoop() {
if (!window_) {
return;
}
initBgGeometry();
initBgProgram();
if (!initBgProgram()) {
return;
}
while (!glfwWindowShouldClose(window_.get())) {
processInput(window_.get());
glClearColor(0.08f, 0.08f, 0.10f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
drawBg();
glfwSwapBuffers(window_.get());
glfwPollEvents();
}
}
@@ -149,6 +259,7 @@ private:
}
void onFramebufferSize(int width, int height) {
viewport_ = {width, height};
glViewport(0, 0, width, height);
}
@@ -171,6 +282,7 @@ private:
float ypos = static_cast<float>(y);
if (camera_.firstMouse()) {
std::cout << "in firstMouse()\n";
lastX_ = x;
lastY_ = y;
camera_.triggleFirstMouse();
@@ -186,8 +298,10 @@ private:
}
static void scrollCallback(GLFWwindow* window, double xoffset, double yoffset) {
std::cout << "scrollCallback\n";
auto* self = static_cast<GLWidget*>(glfwGetWindowUserPointer(window));
if (!self) {
std::cout << "auto* self = static_cast<GLWidget*>(glfwGetWindowUserPointer(window)) failed\n";
return;
}
self->onScrollRoll(xoffset, yoffset);
@@ -202,23 +316,35 @@ private:
std::unique_ptr<GLFWwindow, std::function<void(GLFWwindow*)>> window_;
std::string bgFragShaderPath_;
std::string bgVertShaderPath_;
unsigned int bgVao_;
unsigned int bgVbo_;
unsigned int bgVao_ = 0;
unsigned int bgVbo_ = 0;
std::unique_ptr<LOpenGLProgram> panelProg_;
std::string panelVertShaderPath_;
std::string panelFragShaderPath_;
unsigned int panelVao_ = 0;
unsigned int panelVbo_ = 0;
float panelWidth_ = 0.25;
float panelHeight_ = 0.35;
float panelDepth_ = 0.05;
ViewPort viewport_{800, 600};
Camera camera_;
bool firstMouse_ = true;
float lastX_;
float lastY_;
bool deinit_;
};
int main() {
{
GLWidget glw({600, 800});
glw.setBgShaderPath("bg.vert", "bg.frag");
glw.setBgShaderPath("../shader/bg.vert", "../shader/bg.frag");
glw.eventLoop();
}
glfwTerminate();
return 0;
}

25
shader/bg.frag
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@@ -9,9 +9,9 @@ uniform bool uLightMode;
float gridLine(float stepPx) {
vec2 coord = gl_FragCoord.xy;
vec2 q = coord / stepPx;
vec2 q = abs(fract(q - 0.5) - 0.5) / fwidth(stepPx);
vec2 q = coord / max(stepPx, 1.0);
vec2 fw = max(fwidth(q), vec2(1e-6));
q = abs(fract(q - 0.5) - 0.5) / fw;
float line = 1.0 - min(min(q.x, q.y), 1.0);
return line;
@@ -21,27 +21,24 @@ void main() {
vec2 viewport = max(uViewport, vec2(1.0));
vec2 uv = gl_FragCoord.xy / viewport;
vec3 topCol, botCol, majCol, minCol;
float majStrength, minStrength;
float vignettePow, vignetteStrength;
vec3 topCol, botCol;
float majorStrength, minorStrength;
topCol = vec3(0.99, 0.99, 1.00);
botCol = vec3(0.94, 0.95, 0.98);
minorCol = vec3(0.80, 0.82, 0.87);
majorCol = vec3(0.70, 0.73, 0.80);
vec3 minorCol = vec3(0.80, 0.82, 0.87);
vec3 majorCol = vec3(0.70, 0.73, 0.80);
minorStrength = 0.22;
majorStrength = 0.35;
vignettePow = 0.12;
vignetteStrength = 0.35;
minorStrength = 0.28;
majorStrength = 0.45;
vec3 col = mix(botCol, topCol, uv.y);
float minor = gridLine(max(uMinorStep, 1.0));
float major = gridLine(max(uMajorStep, 1.0));
col = mix(col, minorCol, minStrength * minor);
col = mix(col, majorCol, majStrength * major);
col = mix(col, minorCol, minorStrength * minor);
col = mix(col, majorCol, majorStrength * major);
vec2 p = uv * 2.0 - 1.0;
float v = clamp(1.0 - dot(p, p) * 0.12 , 0.0, 1.0);