static void window_draw(struct window *window)
{
struct mat4 matrix, modelview, projection, transform, result;
GLfloat aspect;
aspect = window->width / (GLfloat)window->height;
mat4_perspective(&projection, 35.0f, aspect, 1.0f, 1024.0f);
mat4_identity(&modelview);
mat4_rotate_x(&transform, x);
mat4_multiply(&result, &modelview, &transform);
mat4_rotate_y(&transform, y);
mat4_multiply(&modelview, &result, &transform);
mat4_rotate_z(&transform, z);
mat4_multiply(&result, &modelview, &transform);
mat4_translate(&transform, 0.0f, 0.0f, -2.0f);
mat4_multiply(&modelview, &transform, &result);
mat4_multiply(&matrix, &projection, &modelview);
glUniformMatrix4fv(mvp, 1, GL_FALSE, (GLfloat *)&matrix);
glViewport(0, 0, window->width, window->height);
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glDrawElements(GL_TRIANGLES, ARRAY_SIZE(indices), GL_UNSIGNED_SHORT,
indices);
eglSwapBuffers(window->egl.display, window->egl.surface);
x += 0.3f;
y += 0.2f;
z += 0.4f;
}
Mat4 Entity_GetModelTransform(Entity* entity)
{
Mat4 temp;
Mat4 rotation = mat4_rotate_x(entity->rotX);
temp = mat4_rotate_y(entity->rotY);
rotation = mat4_mul(&rotation, &temp);
temp = mat4_rotate_z(entity->rotZ);
rotation = mat4_mul(&rotation, &temp);
temp = mat4_translate(&entity->position);
Mat4 modelTransform = mat4_mul(&temp, &rotation);
temp = mat4_scale(entity->scale[0], entity->scale[1], entity->scale[2]);
modelTransform = mat4_mul(&modelTransform, &temp);
return modelTransform;
}
static void window_draw(struct window *window)
{
static const GLfloat vertices[] = {
/* front */
-0.5f, -0.5f, 0.5f, 1.0f,
0.5f, -0.5f, 0.5f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f,
-0.5f, 0.5f, 0.5f, 1.0f,
/* back */
-0.5f, -0.5f, -0.5f, 1.0f,
0.5f, -0.5f, -0.5f, 1.0f,
0.5f, 0.5f, -0.5f, 1.0f,
-0.5f, 0.5f, -0.5f, 1.0f,
/* left */
-0.5f, -0.5f, 0.5f, 1.0f,
-0.5f, 0.5f, 0.5f, 1.0f,
-0.5f, 0.5f, -0.5f, 1.0f,
-0.5f, -0.5f, -0.5f, 1.0f,
/* right */
0.5f, -0.5f, 0.5f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f,
0.5f, 0.5f, -0.5f, 1.0f,
0.5f, -0.5f, -0.5f, 1.0f,
/* top */
-0.5f, 0.5f, 0.5f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f,
0.5f, 0.5f, -0.5f, 1.0f,
-0.5f, 0.5f, -0.5f, 1.0f,
/* bottom */
-0.5f, -0.5f, 0.5f, 1.0f,
0.5f, -0.5f, 0.5f, 1.0f,
0.5f, -0.5f, -0.5f, 1.0f,
-0.5f, -0.5f, -0.5f, 1.0f,
};
static const GLfloat colors[] = {
/* front */
1.0f, 0.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 1.0f,
1.0f, 0.0f, 0.0f, 1.0f,
/* back */
1.0f, 1.0f, 0.0f, 1.0f,
1.0f, 1.0f, 0.0f, 1.0f,
1.0f, 1.0f, 0.0f, 1.0f,
1.0f, 1.0f, 0.0f, 1.0f,
/* left */
0.0f, 0.0f, 1.0f, 1.0f,
0.0f, 0.0f, 1.0f, 1.0f,
0.0f, 0.0f, 1.0f, 1.0f,
0.0f, 0.0f, 1.0f, 1.0f,
/* right */
1.0f, 0.0f, 1.0f, 1.0f,
1.0f, 0.0f, 1.0f, 1.0f,
1.0f, 0.0f, 1.0f, 1.0f,
1.0f, 0.0f, 1.0f, 1.0f,
/* top */
0.0f, 1.0f, 0.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
/* bottom */
1.0f, 0.5f, 0.0f, 1.0f,
1.0f, 0.5f, 0.0f, 1.0f,
1.0f, 0.5f, 0.0f, 1.0f,
1.0f, 0.5f, 0.0f, 1.0f,
};
static const GLushort indices[] = {
/* front */
0, 1, 2,
0, 2, 3,
/* back */
4, 5, 6,
4, 6, 7,
/* left */
8, 9, 10,
8, 10, 11,
/* right */
12, 13, 14,
12, 14, 15,
/* top */
16, 17, 18,
16, 18, 19,
/* bottom */
20, 21, 22,
20, 22, 23,
};
struct mat4 matrix, modelview, projection, transform, result;
static GLfloat x = 0.0f, y = 0.0f, z = 0.0f;
GLint position, color, mvp;
GLuint vs, fs, program;
GLfloat aspect;
vs = glsl_shader_load(GL_VERTEX_SHADER, vertex_shader,
ARRAY_SIZE(vertex_shader));
fs = glsl_shader_load(GL_FRAGMENT_SHADER, fragment_shader,
ARRAY_SIZE(fragment_shader));
program = glsl_program_create(vs, fs);
glsl_program_link(program);
glUseProgram(program);
position = glGetAttribLocation(program, "position");
color = glGetAttribLocation(program, "color");
mvp = glGetUniformLocation(program, "mvp");
aspect = window->width / (GLfloat)window->height;
mat4_perspective(&projection, 60.0f, aspect, 1.0f, 1024.0f);
mat4_identity(&modelview);
mat4_rotate_x(&transform, x);
mat4_multiply(&result, &modelview, &transform);
mat4_rotate_y(&transform, y);
mat4_multiply(&modelview, &result, &transform);
mat4_rotate_z(&transform, z);
mat4_multiply(&result, &modelview, &transform);
mat4_translate(&transform, 0.0f, 0.0f, -2.0f);
mat4_multiply(&modelview, &transform, &result);
mat4_multiply(&matrix, &projection, &modelview);
glUniformMatrix4fv(mvp, 1, GL_FALSE, (GLfloat *)&matrix);
glViewport(0, 0, window->width, window->height);
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glVertexAttribPointer(position, 4, GL_FLOAT, GL_FALSE,
4 * sizeof(GLfloat), vertices);
glEnableVertexAttribArray(position);
glVertexAttribPointer(color, 4, GL_FLOAT, GL_FALSE,
4 * sizeof(GLfloat), colors);
glEnableVertexAttribArray(color);
glDrawElements(GL_TRIANGLES, ARRAY_SIZE(indices), GL_UNSIGNED_SHORT,
indices);
eglSwapBuffers(window->egl.display, window->egl.surface);
x += 0.3f;
y += 0.2f;
z += 0.4f;
}