glm::vec3 Camera::pickAgainstPlane(float x, float y, const glm::vec4& plane) const {
int width = 0, height = 0;
glfwGetWindowSize(glfwGetCurrentContext(), &width, &height);
glm::vec3 screenPos(x / width * 2 - 1, (y / height * 2 - 1) * -1, -1);
screenPos.x /= m_projection[0][0];
screenPos.y /= m_projection[1][1];
glm::vec3 dir = glm::normalize(m_transform * glm::vec4(screenPos, 0)).xyz();
float d = (plane.w - glm::dot(m_transform[3].xyz(), plane.xyz()) / glm::dot(dir, plane.xyz()));
return m_transform[3].xyz() + dir * d;
}
Collision falksalt::collides(glm::vec4 rect,
glm::vec2 start, glm::vec2 end)
{
std::vector<Collision> collisions(4);
collisions[0] = intersects(start, end, rect.xy(), rect.xy() + glm::vec2(rect.z, 0));
collisions[0].side = Side::Up;
collisions[1] = intersects(start, end, rect.xy() + glm::vec2(0, rect.w),
rect.xy() + rect.zw());
collisions[1].side = Side::Down;
collisions[2] = intersects(start, end, rect.xy(), rect.xy() + glm::vec2(0, rect.w));
collisions[2].side = Side::Left;
collisions[3] = intersects(start, end, rect.xy() + glm::vec2(rect.z, 0),
rect.xy() + rect.zw());
collisions[3].side = Side::Right;
return closest(start, collisions);
}
glm::vec3 Camera::PickAgainstPlane(float x, float y, const glm::vec4& _plane) {
int width = 0;
int height = 0;
glfwGetWindowSize(glfwGetCurrentContext(), &width, &height);
glm::vec3 screenPos(x / width * 2 - 1, (y / height * 2 - 1) * -1, -1);
screenPos.x /= m_projectionTransform[0][0];
screenPos.y /= m_projectionTransform[1][1];
glm::vec3 dir = glm::normalize(m_worldTransform * glm::vec4(screenPos, 0)).xyz();
float d = (_plane.w - glm::dot(m_worldTransform[3].xyz(), _plane.xyz()) / glm::dot(dir, _plane.xyz()));
if (d >= 0) {
return m_worldTransform[3].xyz() + dir * d;
} else {
return glm::vec3(0);
}
}
void TextEngineRenderer::Render() {
GameState ¤t_state = updater.GetCurrentState();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
PushMatrix();
matrix_stack.back() *= glm::scale(glm::mat4(1), glm::vec3(glm::vec2(current_state.zoom * 0.1f), 1.0f));
matrix_stack.back() *= glm::translate(glm::mat4(1), glm::vec3(-current_state.camera_position, 0));
const glm::vec2 position = glm::vec2(current_state.player_body->GetPosition().x,
current_state.player_body->GetPosition().y);
fill = glm::vec4(0.0f, 0.5f, 0.3f, 0.5f);
for (const auto &area : scene.areas) {
if (area->invisible) {
continue;
}
if (Shape::kAxisAlignedBoundingBox == area->shape) {
DrawAxisAlignedBoundingBox(area->aabb);
} else {
DrawCircle(area->aabb.center(), area->aabb.radius());
}
}
fill = glm::vec4(1.0f, 0.0f, 0.0f, 0.5f);
for (const auto &object : scene.objects) {
if (object->invisible) {
continue;
}
if (Shape::kAxisAlignedBoundingBox == object->shape) {
DrawAxisAlignedBoundingBox(object->aabb);
} else {
DrawCircle(object->aabb.center(), object->aabb.radius());
}
}
const glm::mat4 normalized_to_reversed = glm::scale(glm::mat4(), glm::vec3(1.0f, -1.0f, 1.0f));
const glm::mat4 reversed_to_offset = glm::translate(glm::mat4(), glm::vec3(glm::vec2(1.0f), 0.0f));
const glm::mat4 offset_to_screen = glm::scale(glm::mat4(), glm::vec3(glm::vec2(0.5f), 1.0f));
const glm::mat4 screen_to_window = glm::scale(glm::mat4(), glm::vec3(width, height, 1.0f));
const glm::mat4 transform = (screen_to_window * offset_to_screen *
reversed_to_offset * normalized_to_reversed *
model_view * projection * matrix_stack.back());
const glm::mat4 transform2 = (screen_to_window * offset_to_screen *
reversed_to_offset *
model_view * projection * matrix_stack.back());
const auto inverse = glm::inverse(transform2);
const glm::vec4 homogeneous = transform * glm::vec4(position, 0.0f, 1.0f);
const glm::vec2 transformed = homogeneous.xy() / homogeneous.w;
fill = glm::vec4(0.5f, 0.5f, 0.6f, 1.0f);
PushMatrix();
matrix_stack.back() *= glm::translate(glm::mat4(1), glm::vec3(position, 0));
matrix_stack.back() *= glm::rotate(glm::mat4(1),
current_state.player_body->GetAngle(),
glm::vec3(0, 0, 1));
DrawRectangle(glm::vec2(0), glm::vec2(0.25f, 0.5f));
PopMatrix();
PopMatrix();
if (edit) {
MaybeRebuildAttenuationShader();
if (current_state.selected_item) {
attenuation3_program.Use();
attenuation3_program.Uniforms({
{u8"model_view_inverse", &inverse}
});
const auto isaabb3 = Shape::kAxisAlignedBoundingBox == current_state.selected_item->shape;
glUniform1i(attenuation3_program.GetUniformLocation(u8"selected_isaabb"), isaabb3);
if (Shape::kAxisAlignedBoundingBox == current_state.selected_item->shape) {
attenuation3_program.Uniforms({
{u8"selected_minimum_or_center", current_state.selected_item->aabb.minimum},
{u8"selected_maximum_or_radius", current_state.selected_item->aabb.maximum},
});
CHECK_STATE(!glGetError());
} else {
attenuation3_program.Uniforms({
{u8"selected_minimum_or_center", current_state.selected_item->aabb.center()},
{u8"selected_maximum_or_radius", glm::vec2(current_state.selected_item->aabb.radius())},
});
CHECK_STATE(!glGetError());
}
const auto attenuation3_coefficients = glm::vec3(
current_state.selected_item->base_attenuation,
current_state.selected_item->linear_attenuation,
current_state.selected_item->quadratic_attenuation);
attenuation3_program.Uniforms({
{u8"selected_attenuation", attenuation3_coefficients},
});
const auto color3 = glm::vec4(0, 0, 0, 0.125);
attenuation3_program.Uniforms({
{u8"color", color3}
});
attenuation_array.Bind();
glDrawArrays(attenuation.element_type, 0, attenuation.element_count);
CHECK_STATE(!glGetError());
attenuation_program.Use();
attenuation_program.Uniforms({
{u8"model_view_inverse", &inverse}
});
const auto isaabb = Shape::kAxisAlignedBoundingBox == current_state.selected_item->shape;
glUniform1i(attenuation_program.GetUniformLocation(u8"selected_isaabb"), isaabb);
if (Shape::kAxisAlignedBoundingBox == current_state.selected_item->shape) {
attenuation_program.Uniforms({
{u8"selected_minimum_or_center", current_state.selected_item->aabb.minimum},
{u8"selected_maximum_or_radius", current_state.selected_item->aabb.maximum},
});
CHECK_STATE(!glGetError());
} else {
attenuation_program.Uniforms({
{u8"selected_minimum_or_center", current_state.selected_item->aabb.center()},
{u8"selected_maximum_or_radius", glm::vec2(current_state.selected_item->aabb.radius())},
});
CHECK_STATE(!glGetError());
}
const auto attenuation_coefficients = glm::vec3(
current_state.selected_item->base_attenuation,
current_state.selected_item->linear_attenuation,
current_state.selected_item->quadratic_attenuation);
attenuation_program.Uniforms({
{u8"selected_attenuation", attenuation_coefficients},
});
const auto color = glm::vec4(0, 0, 0, 0.5);
attenuation_program.Uniforms({
{u8"color", color}
});
attenuation_array.Bind();
glDrawArrays(attenuation.element_type, 0, attenuation.element_count);
CHECK_STATE(!glGetError());
}
}
const auto mouse_position = 2.0f * mouse.get_cursor_position();
unsigned char mouse_buttons = 0;
if (mouse.IsButtonDown(GLFW_MOUSE_BUTTON_1)) {
mouse_buttons |= IMGUI_MBUT_LEFT;
}
if (mouse.IsButtonDown(GLFW_MOUSE_BUTTON_2)) {
mouse_buttons |= IMGUI_MBUT_RIGHT;
}
if (edit) {
imguiBeginFrame(mouse_position.x, height - mouse_position.y, mouse_buttons, 0);
for (auto &area : scene.areas) {
const glm::vec4 homogeneous = transform * glm::vec4(area->aabb.minimum.x, area->aabb.maximum.y, 0.0f, 1.0f);
const glm::vec2 transformed = homogeneous.xy() / homogeneous.w;
imguiDrawText(transformed.x, height - transformed.y, IMGUI_ALIGN_LEFT, area->name.c_str(), imguiRGBA(0, 0, 0));
}
for (auto &object : scene.objects) {
const glm::vec4 homogeneous = transform * glm::vec4(object->aabb.minimum.x, object->aabb.maximum.y, 0.0f, 1.0f);
const glm::vec2 transformed = homogeneous.xy() / homogeneous.w;
imguiDrawText(transformed.x, height - transformed.y, IMGUI_ALIGN_LEFT, object->name.c_str(), imguiRGBA(0, 0, 0));
}
if (current_state.selected_item) {
std::ostringstream name, constant, linear, quadratic;
name << current_state.selected_item->name;
imguiDrawText(10, height - 50, IMGUI_ALIGN_LEFT, name.str().c_str(), imguiRGBA(0, 0, 0));
constant << "c: " << current_state.selected_item->base_attenuation;
imguiDrawText(10, height - 75, IMGUI_ALIGN_LEFT, constant.str().c_str(), imguiRGBA(0, 0, 0));
linear << "l: " << current_state.selected_item->linear_attenuation;
imguiDrawText(10, height - 100, IMGUI_ALIGN_LEFT, linear.str().c_str(), imguiRGBA(0, 0, 0));
quadratic << "q: " << current_state.selected_item->quadratic_attenuation << std::endl;
imguiDrawText(10, height - 125, IMGUI_ALIGN_LEFT, quadratic.str().c_str(), imguiRGBA(0, 0, 0));
}
imguiEndFrame();
}
imguiRenderGLDraw(width, height);
}