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rendering.c: only update opengl viewport once it's actually changed

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This commit is contained in:
veclav talica 2024-07-27 17:10:08 +03:00
parent 79bc261ccd
commit f5ba4a75bd
4 changed files with 25 additions and 20 deletions
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2
src/context.h
View File

@ -62,6 +62,8 @@ typedef struct context {
bool debug;
bool is_running;
bool resync_flag;
bool window_size_has_changed;
} t_ctx;
extern t_ctx ctx;

1
src/input.h
View File

@ -54,7 +54,6 @@ struct action_hash_item {
struct input_state {
struct action_hash_item *action_hash;
SDL_Renderer *renderer; /* some input relates to the screen in some way */
const uint8_t *keyboard_state; /* array of booleans indexed by scancode */
uint32_t mouse_state; /* SDL mouse button bitmask */
t_vec2 mouse_window_position;

3
src/main.c
View File

@ -23,6 +23,8 @@
static void poll_events(void) {
SDL_Event e;
ctx.window_size_has_changed = false;
while (SDL_PollEvent(&e)) {
switch (e.type) {
case SDL_QUIT:
@ -37,6 +39,7 @@ static void poll_events(void) {
case SDL_WINDOWEVENT_RESIZED:
ctx.window_w = e.window.data1;
ctx.window_h = e.window.data2;
ctx.window_size_has_changed = true;
break;
}

39
src/rendering.c
View File

@ -141,26 +141,27 @@ static void render_space(void) {
void render(void) {
textures_update_atlas(&ctx.texture_cache);
/* TODO: only do this when needed */
/* fit rendering context onto the resizable screen */
if ((float)ctx.window_w / (float)ctx.window_h > RENDER_BASE_RATIO) {
float ratio = (float)ctx.window_h / (float)RENDER_BASE_HEIGHT;
int w = (int)((float)RENDER_BASE_WIDTH * ratio);
glViewport(
ctx.window_w / 2 - w / 2,
0,
w,
ctx.window_h
);
} else {
float ratio = (float)ctx.window_w / (float)RENDER_BASE_WIDTH;
int h = (int)((float)RENDER_BASE_HEIGHT * ratio);
glViewport(
0,
ctx.window_h / 2 - h / 2,
ctx.window_w,
h
);
if (ctx.window_size_has_changed) {
if ((float)ctx.window_w / (float)ctx.window_h > RENDER_BASE_RATIO) {
float ratio = (float)ctx.window_h / (float)RENDER_BASE_HEIGHT;
int w = (int)((float)RENDER_BASE_WIDTH * ratio);
glViewport(
ctx.window_w / 2 - w / 2,
0,
w,
ctx.window_h
);
} else {
float ratio = (float)ctx.window_w / (float)RENDER_BASE_WIDTH;
int h = (int)((float)RENDER_BASE_HEIGHT * ratio);
glViewport(
0,
ctx.window_h / 2 - h / 2,
ctx.window_w,
h
);
}
}
glClearColor((1.0f / 255) * 230,