mousemove

assets/orange.vert

@@ -1,7 +1,8 @@
 #version 330 core
 in vec3 position;
 out vec3 vertPosition;
+uniform vec2 uniMouse;
 void main() {
-    vertPosition = position;
+    vertPosition = position + vec3(uniMouse.x, uniMouse.y, 0);
     gl_Position = vec4(vertPosition, 1);
 }

include/InputCtl.hpp

@@ -43,6 +43,7 @@ struct InputCtl {
 
     void register_callbacks(GLFWwindow *window);
 
+    glm::vec2 get_cursor_pos();
     glm::mat4x4 get_view_matrix();
     glm::mat4x4 get_projection_matrix();
 };

src/Game.cpp

@@ -73,10 +73,12 @@ void Game::render() {
     auto view = m_inputCtl.get_view_matrix();
     glm::mat4x4 model(1.0f); // 等会用更现代的方式指定这些矩阵
 
-    /* int prog; */
-    /* CHECK_GL(glGetIntegerv(GL_CURRENT_PROGRAM, &prog)); */
-    /* CHECK_GL(glUniformMatrix4fv(glGetUniformLocation(prog, "model"), 1, GL_FALSE, glm::value_ptr(model))); */
-    /* CHECK_GL(glUniformMatrix4fv(glGetUniformLocation(prog, "view"), 1, GL_FALSE, glm::value_ptr(view))); */
-    /* CHECK_GL(glUniformMatrix4fv(glGetUniformLocation(prog, "projection"), 1, GL_FALSE, glm::value_ptr(projection))); */
+    /* CHECK_GL(glUniformMatrix4fv(glGetUniformLocation(m_private->program, "model"), 1, GL_FALSE, glm::value_ptr(model))); */
+    /* CHECK_GL(glUniformMatrix4fv(glGetUniformLocation(m_private->program, "view"), 1, GL_FALSE, glm::value_ptr(view))); */
+    /* CHECK_GL(glUniformMatrix4fv(glGetUniformLocation(m_private->program, "projection"), 1, GL_FALSE, glm::value_ptr(projection))); */
+
+    glm::vec2 mousePos = m_inputCtl.get_cursor_pos();
+    int location = glGetUniformLocation(m_private->program, "uniMouse");
+    CHECK_GL(glUniform2f(location, mousePos.x, mousePos.y));
     m_private->obj.draw_obj();
 }

src/InputCtl.cpp

@@ -132,6 +132,17 @@ InputCtl::InputCtl() : m_private(std::make_unique<Private>()) {}
 
 InputCtl::~InputCtl() = default;
 
+glm::vec2 InputCtl::get_cursor_pos() {
+    double xpos, ypos;
+    glfwGetCursorPos(m_private->window, &xpos, &ypos);
+    int width, height;
+    glfwGetWindowSize(m_private->window, &width, &height);
+
+    float x = (float)(2 * xpos / width - 1);
+    float y = (float)(2 * (height - ypos) / height - 1);
+    return glm::vec2(x, y);
+}
+
 glm::mat4x4 InputCtl::get_view_matrix() {
     return m_private->camState.view_matrix();
 }
@@ -187,15 +198,7 @@ void InputCtl::cursor_pos_callback(double xpos, double ypos) {
 }
 
 void InputCtl::mouse_button_callback(int button, int action, int mods) {
-    double xpos, ypos;
-    glfwGetCursorPos(m_private->window, &xpos, &ypos);
-    int width, height;
-    glfwGetWindowSize(m_private->window, &width, &height);
-
-    float x = (float)(2 * xpos / width - 1);
-    float y = (float)(2 * (height - ypos) / height - 1);
-    glm::vec2 pos(x, y);
-
+    auto pos = get_cursor_pos();
     m_private->lastpos = pos;
 
     m_private->moving = m_inputPref.orbit_binding.check_is_pressed(m_private->window)