void App::update(float delta_time) {
if (anim_play) frame_count++;
if (!hide_gui) gui();
// autoreload frag shader (every 60 frames)
if (shader_filepath && shader_file_autoreload && (frame_count % 60) == 0) {
struct stat attr;
if (!stat(shader_filepath, &attr)) { // file exists
if (attr.st_mtime > shader_file_mtime) { // file has been modified
shader_file_mtime = (int)attr.st_mtime;
reloadShader();
}
}
}
// update camera (-z: forward, y: up)
camera_euler_angles += 2.0f*delta_time
* v3(-movement_command.rotate.x, -movement_command.rotate.y, 0.0f);
camera_euler_angles.x = fminf(fmaxf(-0.5f*(float)M_PI, camera_euler_angles.x), 0.5f*(float)M_PI); // clamp
mat3 rot_x = rotationMatrix(v3(1.0f, 0.0f, 0.0f), camera_euler_angles.x);
mat3 rot_y = rotationMatrix(v3(0.0f, 1.0f, 0.0f), camera_euler_angles.y);
mat3 rot_z = rotationMatrix(v3(0.0f, 0.0f, 1.0f), camera_euler_angles.z);
mat3 rot = rot_y * rot_x * rot_z;
camera_location += rot * (8.0f*delta_time*movement_command.move);
mat4 view_to_world = translationMatrix(camera_location) * m4(rot);
mat4 world_to_view = m4(transpose(rot)) * translationMatrix(-camera_location);
// bind textures
for (int tsi = 0; tsi < (int)ARRAY_COUNT(texture_slots); tsi++) {
glActiveTexture(GL_TEXTURE0+tsi);
glBindTexture(texture_slots[tsi].target, texture_slots[tsi].texture);
}
// draw fullscreen triangle(s)
glClearColor(0.2f, 0.21f, 0.22f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
{ BindShader bind_shader(shader);
if (!compile_error_log) {
for (int i = 0; i < uniform_count; i++) {
uniforms[i].apply();
}
}
// apply builtin uniforms
u_time = (float)frame_count / 60.0f;
glUniform1f(shader.getUniformLocation(u_time_name), u_time);
vec2 u_resolution = v2(video.pixel_scale*video.width, video.pixel_scale*video.height);
glUniform2fv(shader.getUniformLocation(u_resolution_name), 1, u_resolution.e);
glUniformMatrix4fv(shader.getUniformLocation(u_view_to_world_name), 1, GL_FALSE, view_to_world.e);
glUniformMatrix4fv(shader.getUniformLocation(u_world_to_view_name), 1, GL_FALSE, world_to_view.e);
if (single_triangle_mode) {
{ BindArrayBuffer bind_array_buffer(single_triangle_vbo);
glEnableVertexAttribArray(VAT_POSITION);
glVertexAttribPointer(VAT_POSITION, 2, GL_FLOAT, GL_FALSE, 0, (GLvoid*)0);
glDrawArrays(GL_TRIANGLES, 0, 3);
glDisableVertexAttribArray(VAT_POSITION);
}
} else {
{ BindArrayBuffer bind_array_buffer(two_triangles_vbo);
glEnableVertexAttribArray(VAT_POSITION);
glVertexAttribPointer(VAT_POSITION, 2, GL_FLOAT, GL_FALSE, 0, (GLvoid*)0);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glDisableVertexAttribArray(VAT_POSITION);
}
}
}
}
void App::update(float delta_time) {
if (anim_play) frame_count++;
// builtin uniform names
static char u_time_name[64] = "u_time";
static char u_resolution_name[64] = "u_resolution";
static char u_view_mat_name[64] = "u_view_mat";
if (ImGui::BeginMainMenuBar()) {
if (ImGui::BeginMenu("File")) {
if (ImGui::MenuItem("Open fragment shader"/*, "Ctrl+O"*/)) {
openShaderDialog();
}
if (ImGui::IsItemHovered() && file_path) {
ImGui::SetTooltip("%s", file_path);
}
if (ImGui::MenuItem("Autoreload", nullptr, file_autoreload)) {
file_autoreload = !file_autoreload;
}
ImGui::EndMenu();
}
if (ImGui::BeginMenu("Animation")) {
if (ImGui::MenuItem(anim_play ? "Pause" : "Play")) {
anim_play = !anim_play;
}
if (ImGui::MenuItem("Reset")) {
frame_count = 0;
}
ImGui::EndMenu();
}
if (ImGui::BeginMenu("Window")) {
if (ImGui::MenuItem("Uniforms", nullptr, show_uniforms_window)) {
show_uniforms_window = !show_uniforms_window;
}
if (ImGui::MenuItem("Textures", nullptr, show_textures_window)) {
show_textures_window = !show_textures_window;
}
ImGui::EndMenu();
}
ImGui::EndMainMenuBar();
}
if (show_uniforms_window) {
if (ImGui::Begin("Uniforms", &show_uniforms_window)) {
if (ImGui::CollapsingHeader("Built-in uniform names")) {
ImGui::InputText("Time", u_time_name, sizeof(u_time_name));
ImGui::InputText("Resolution", u_resolution_name, sizeof(u_resolution_name));
ImGui::InputText("View Matrix", u_view_mat_name, sizeof(u_view_mat_name));
}
ImGui::Separator();
if (!compile_error_log) {
ImGui::AlignFirstTextHeightToWidgets();
ImGui::Text("Data"); ImGui::SameLine();
if (ImGui::Button("Clear")) {
if (uniform_data) {
memset(uniform_data, 0, uniform_data_size);
}
} ImGui::SameLine();
if (ImGui::Button("Save")) {
writeUniformData();
} ImGui::SameLine();
if (ImGui::Button("Load")) {
readUniformData();
}
for (int i = 0; i < uniform_count; i++) {
// skip builtin uniforms
if (!strcmp(u_time_name, uniforms[i].name)) continue;
if (!strcmp(u_resolution_name, uniforms[i].name)) continue;
if (!strcmp(u_view_mat_name, uniforms[i].name)) continue;
uniforms[i].gui();
}
}
}
ImGui::End();
}
if (show_textures_window) {
if (ImGui::Begin("Textures", &show_textures_window, ImGuiWindowFlags_NoResize|ImGuiWindowFlags_AlwaysAutoResize)) {
ImGui::Columns(2);
for (int tsi = 0; tsi < ARRAY_COUNT(texture_slots); tsi++) {
TextureSlot *texture_slot = texture_slots+tsi;
ImGui::BeginGroup();
ImGui::PushID(tsi);
ImGui::Text("%d:", tsi);
ImGui::SameLine();
ImGui::PushStyleColor(ImGuiCol_Button, ImColor::HSV(0.0f, 0.6f, 0.6f));
ImGui::PushStyleColor(ImGuiCol_ButtonHovered, ImColor::HSV(0.0f, 0.7f, 0.7f));
ImGui::PushStyleColor(ImGuiCol_ButtonActive, ImColor::HSV(0.0f, 0.8f, 0.8f));
if (ImGui::SmallButton("x")) texture_slot->clear();
ImGui::PopStyleColor(3);
if (ImGui::Button(" 2D ")) openImageDialog(texture_slot);
if (ImGui::Button("Cube")) openImageDialog(texture_slot, /*load_cube_cross*/true);
ImGui::PopID();
ImGui::EndGroup();
ImGui::SameLine();
//ImTextureID im_tex_id = (ImTextureID)(intptr_t)texture_slot->texture;
ImGui::Image((void*)texture_slot, ImVec2(64, 64));
if (ImGui::IsItemHovered() && texture_slot->image_file_path) {
ImGui::SetTooltip("%s\n%dx%d", texture_slot->image_file_path,
texture_slot->image_width, texture_slot->image_height);
}
if ((tsi&1) && tsi+1 != ARRAY_COUNT(texture_slots)) {
ImGui::Separator();
} else {
ImGui::SameLine(); ImGui::Spacing();
}
ImGui::NextColumn();
}
ImGui::Columns(1);
}
ImGui::End();
}
//ImGui::ShowTestWindow();
// autoreload (every 60 frames)
if (file_path && file_autoreload && (frame_count % 60) == 0) {
struct stat attr;
if (!stat(file_path, &attr)) { // file exists
if (attr.st_mtime > file_mod_time) { // file has been modified
file_mod_time = attr.st_mtime;
loadShader(file_path, /*initial*/false);
}
}
}
// overlay messages
int overlay_flags = ImGuiWindowFlags_NoTitleBar
| ImGuiWindowFlags_NoResize | ImGuiWindowFlags_AlwaysAutoResize
| ImGuiWindowFlags_NoBringToFrontOnFocus
| ImGuiWindowFlags_NoMove
| ImGuiWindowFlags_NoSavedSettings;
if (!file_path) {
ImGui::SetNextWindowPosCenter();
ImGui::Begin("Overlay", nullptr, ImVec2(0, 0), 0.3f, overlay_flags);
ImGui::AlignFirstTextHeightToWidgets(); // valign text to button
ImGui::Text("No fragment shader");
ImGui::SameLine();
if (ImGui::Button("Open")) {
openShaderDialog();
}
ImGui::End();
} else if (compile_error_log) {
ImGui::SetNextWindowPosCenter();
ImGui::Begin("Overlay", nullptr, ImVec2(0, 0), 0.3f, overlay_flags);
ImGui::TextUnformatted(compile_error_log);
ImGui::End();
}
// update camera
camera.euler_angles += 2.0f*delta_time
* v3(movement_command.rotate.x, movement_command.rotate.y, 0.0f);
mat3 rot_y = rotationMatrix(v3(0.0f, 0.0f, 1.0f), -camera.euler_angles.y);
camera.location += rot_y * (8.0f*delta_time*movement_command.move);
camera.updateViewMatrix();
// bind textures
for (int tsi = 0; tsi < ARRAY_COUNT(texture_slots); tsi++) {
glActiveTexture(GL_TEXTURE0+tsi);
glBindTexture(texture_slots[tsi].target, texture_slots[tsi].texture);
}
// draw two triangles
glClearColor(0.2, 0.21, 0.22, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
{ BindShader bind_shader(shader);
if (!compile_error_log) {
for (int i = 0; i < uniform_count; i++) {
uniforms[i].apply();
}
}
// apply builtin uniforms
u_time = (float)frame_count / 60.0f;
glUniform1f(shader.getUniformLocation(u_time_name), u_time);
vec2 u_resolution = v2(video.pixel_scale*video.width, video.pixel_scale*video.height);
glUniform2fv(shader.getUniformLocation(u_resolution_name), 1, u_resolution.e);
mat4 u_inv_view_mat = camera.makeInverseViewMatrix();
int u_view_mat_loc = shader.getUniformLocation(u_view_mat_name);
glUniformMatrix4fv(u_view_mat_loc, 1, GL_FALSE, u_inv_view_mat.e);
{ BindArrayBuffer bind_array_buffer(two_triangles_vbo);
glEnableVertexAttribArray(VAT_POSITION);
glVertexAttribPointer(VAT_POSITION, 2, GL_FLOAT, GL_FALSE, 0, (GLvoid*)0);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glDisableVertexAttribArray(VAT_POSITION);
}
}
}
