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ui_t beginui(prge_window_t window, input_t input, shader_t shader, rect_t rect, arena_t *arena, f32 padding)
{
assert(arena);
assert(shader.id);
assert(window.width && window.height);
v2 start = {rect.start.x, rect.end.y};
ui_t ui = {window, input, shader, rect, ui_list, start, arena, padding};
glUseProgram(ui.shader.id);
mat4 projection = ortho(0.0f, ui.window.width, 0.0f, ui.window.height, -1.0f, 1.0f);
shader_set_mat4(ui.shader, SHADER_PROJECTION_MATRIX, projection);
glDisable(GL_DEPTH_TEST);
f32 width = rect.end.x - rect.start.x;
f32 height = rect.end.y - rect.start.y;
mesh_t background = gen_quad_mesh(ui.arena, DEFAULT_TRANSFORM, width, height);
v2 half_width_height = {width/2.0f, height/2.0f};
start = v2_add(rect.start, half_width_height);
mat4 world = mat4_make_transl(v3_from_v2(start));
shader_set_mat4(ui.shader, SHADER_MODEL_MATRIX, world);
v4 color = {0.149f, 0.4f, 0.42f, 1.0f};
shader_set_v4(ui.shader, "color", color);
draw_mesh(background);
clear_mesh(&background);
return ui;
}
i32 button(ui_t *ui, const char *text, f32 width, f32 height)
{
if (width <= 0.0f || height <= 0.0f)
return 0;
v4 color = {0.075f, 0.525f, 0.549f, 1.0f};
i32 pressed = 0;
v2 last = {ui->last.x + ui->padding, ui->last.y - height - ui->padding};
rect_t rect = {last, v2_add(last, (v2){width, height})};
if (in_rect(ui->input.mouse.pos, rect) && !ui->input.mouse.capture) {
color = (v4){0.3f, 0.61f, 0.63f, 1.0f};
if (is_key_pressed(ui->input.mouse.left)) {
pressed = 1;
printf("%s\n", text);
}
}
v2 center = {width/2.0f, height/2.0f};
v2 start = v2_add(last, center);
ui->last.x += width + 2.0f*ui->padding;
mat4 world = mat4_make_transl(v3_from_v2(start));
shader_set_mat4(ui->shader, SHADER_MODEL_MATRIX, world);
shader_set_v4(ui->shader, "color", color);
mesh_t quad = gen_quad_mesh(ui->arena, DEFAULT_TRANSFORM, width, height);
draw_mesh(quad);
clear_mesh(&quad);
return pressed;
}
void endui(void)
{
glEnable(GL_DEPTH_TEST);
glUseProgram(0);
}
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