kotovalexarian/matabstrix
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Add mouse handler and camera rotation

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This commit is contained in:
Meoweg 2015-11-04 18:38:02 +00:00
parent 38262dee11
commit 503626be4a
1 changed files with 35 additions and 10 deletions
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45
main.cpp
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@ -2,11 +2,15 @@
#include <glm/glm.hpp>
#include <glm/gtc/type_ptr.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <GL/glew.h>
#include <GL/glfw.h>
#include <emscripten/emscripten.h>
#include <emscripten/html5.h>
static EM_BOOL on_em_mousemove(int event_type, const EmscriptenMouseEvent *mouse_event, void *user_data);
static GLuint load_shader(GLenum type, const char *source);
@ -19,12 +23,7 @@ static void iterate();
static GLuint view_matrix;
static glm::mat4 view(
1.0, 0.0, 0.0, 0.0,
0.0, 1.0, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, 0.0, 1.0
);
static float delta_z = 0, delta_x = 0;
static const char vertex_shader_source[] = \
"attribute vec4 position; \n"\
@ -41,9 +40,9 @@ static const char fragment_shader_source[] = \
"} \n";
static const GLfloat triangle_vertices[] = {
0.0, 0.8, 0.0,
-0.8, -0.8, 0.0,
0.8, -0.8, 0.0,
0.0, 0.0, 0.8,
-0.3, 0.0, 0.0,
0.3, 0.0, 0.0,
};
static GLuint triangle;
@ -66,6 +65,8 @@ int main()
exit(EXIT_FAILURE);
}
emscripten_set_mousemove_callback(nullptr, nullptr, false, on_em_mousemove);
vertex_shader = load_shader(GL_VERTEX_SHADER, vertex_shader_source);
fragment_shader = load_shader(GL_FRAGMENT_SHADER, fragment_shader_source);
@ -80,7 +81,7 @@ int main()
glGenBuffers(1, &triangle);
glBindBuffer(GL_ARRAY_BUFFER, triangle);
glBufferData(GL_ARRAY_BUFFER, 3 * 7 * sizeof(GLfloat), triangle_vertices, GL_STATIC_DRAW);
glBufferData(GL_ARRAY_BUFFER, 3 * 3 * sizeof(GLfloat), triangle_vertices, GL_STATIC_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(GLfloat), reinterpret_cast<const GLvoid*>(0));
glEnableVertexAttribArray(0);
@ -103,9 +104,33 @@ void iterate()
{
glClear(GL_COLOR_BUFFER_BIT);
glm::mat4 view = glm::mat4(1.0f)
* glm::rotate(glm::mat4(1.0f), glm::radians(delta_x - 90), glm::vec3(1.0f, 0.0f, 0.0f))
* glm::rotate(glm::mat4(1.0f), glm::radians(delta_z), glm::vec3(0.0f, 0.0f, 1.0f));
glUniformMatrix4fv(view_matrix, 1, GL_FALSE, glm::value_ptr(view));
glDrawArrays(GL_TRIANGLES, 0, 3);
glfwPollEvents();
}
EM_BOOL on_em_mousemove(int event_type, const EmscriptenMouseEvent *mouse_event, void *user_data)
{
delta_z += mouse_event->movementX;
delta_x += mouse_event->movementY;
if (delta_z < 0)
delta_z = 359;
else
if (delta_z >= 360)
delta_z = 0;
if (delta_x < -90)
delta_x = -90;
else
if (delta_x > 90)
delta_x = 90;
return true;
}