Adjust testgl.c to test gl_release_behavior

include/SDL3/SDL_test_common.h

@@ -139,6 +139,7 @@ typedef struct
     int gl_accum_blue_size;
     int gl_accum_alpha_size;
     int gl_stereo;
+    int gl_release_behavior;
     int gl_multisamplebuffers;
     int gl_multisamplesamples;
     int gl_retained_backing;

src/test/SDL_test_common.c

@@ -1226,6 +1226,7 @@ bool SDLTest_CommonInit(SDLTest_CommonState *state)
         SDL_GL_SetAttribute(SDL_GL_ACCUM_BLUE_SIZE, state->gl_accum_blue_size);
         SDL_GL_SetAttribute(SDL_GL_ACCUM_ALPHA_SIZE, state->gl_accum_alpha_size);
         SDL_GL_SetAttribute(SDL_GL_STEREO, state->gl_stereo);
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_RELEASE_BEHAVIOR, state->gl_release_behavior);
         SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, state->gl_multisamplebuffers);
         SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, state->gl_multisamplesamples);
         if (state->gl_accelerated >= 0) {

test/testgl.c

@@ -263,6 +263,9 @@ int main(int argc, char *argv[])
     state->gl_green_size = 5;
     state->gl_blue_size = 5;
     state->gl_depth_size = 16;
+    /* For release_behavior to work, at least on Windows, you'll most likely need to set state->gl_major_version = 3 */
+    /* state->gl_major_version = 3; */
+    state->gl_release_behavior = 0;
     state->gl_double_buffer = 1;
     if (fsaa) {
         state->gl_multisamplebuffers = 1;
@@ -331,6 +334,11 @@ int main(int argc, char *argv[])
     } else {
         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Failed to get SDL_GL_DEPTH_SIZE: %s\n", SDL_GetError());
     }
+    if (SDL_GL_GetAttribute(SDL_GL_CONTEXT_RELEASE_BEHAVIOR, &value)) {
+        SDL_Log("SDL_GL_CONTEXT_RELEASE_BEHAVIOR: requested %d, got %d\n", 0, value);
+    } else {
+        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Failed to get SDL_GL_CONTEXT_RELEASE_BEHAVIOR: %s\n", SDL_GetError());
+    }
     if (fsaa) {
         if (SDL_GL_GetAttribute(SDL_GL_MULTISAMPLEBUFFERS, &value)) {
             SDL_Log("SDL_GL_MULTISAMPLEBUFFERS: requested 1, got %d\n", value);