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feat: viewport smart resize to device screen boundaries

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This commit is contained in:
Amir Adal
2026-04-19 18:58:18 +02:00
parent c90c155944
commit d39ffe17d0
1 changed files with 25 additions and 1 deletions
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26
main.cpp
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@@ -60,6 +60,22 @@ void makeRotationZ(float angle, float* m)
m[3] = 0; m[7] = 0; m[11] = 0; m[15] = 1; m[3] = 0; m[7] = 0; m[11] = 0; m[15] = 1;
} }
void computeLetterbox(int windowW, int windowH,
int logicalW, int logicalH,
int* x, int* y, int* w, int* h)
{
float scaleX = (float)windowW / logicalW;
float scaleY = (float)windowH / logicalH;
float scale = (scaleX < scaleY) ? scaleX : scaleY;
*w = (int)(logicalW * scale);
*h = (int)(logicalH * scale);
*x = (windowW - *w) / 2;
*y = (windowH - *h) / 2;
}
extern "C" int APP_MAIN(int argc, char **argv) { extern "C" int APP_MAIN(int argc, char **argv) {
SDL_SetAppMetadata("Example Renderer Primitives", "1.0", "com.example.renderer-primitives"); SDL_SetAppMetadata("Example Renderer Primitives", "1.0", "com.example.renderer-primitives");
SDL_SetHint(SDL_HINT_ORIENTATIONS, "LandscapeLeft LandscapeRight"); SDL_SetHint(SDL_HINT_ORIENTATIONS, "LandscapeLeft LandscapeRight");
@@ -145,7 +161,15 @@ extern "C" int APP_MAIN(int argc, char **argv) {
glBindBuffer(GL_ARRAY_BUFFER, 0); glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0); glBindVertexArray(0);
glViewport(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT); int drawableW, drawableH;
SDL_GetWindowSizeInPixels(window, &drawableW, &drawableH);
int vx, vy, vw, vh;
computeLetterbox(drawableW, drawableH,
SCREEN_WIDTH, SCREEN_HEIGHT,
&vx, &vy, &vw, &vh);
glViewport(vx, vy, vw, vh);
glEnable(GL_DEPTH_TEST); glEnable(GL_DEPTH_TEST);
float transform[16]; float transform[16];