PSP: SDL_RenderClear does not clear entire target texture

[Sawkez]

When rendering to a texture on PSP, SDL_RenderClear only clears the top-left 480x272 region of the texture.

Steps to reproduce

1. Create a texture with SDL_TEXTUREACCESS_TARGET that is larger than 480x272;
2. Set the texture as the current render target;
3. Draw something to the texture;
4. Clear the texture using SDL_RenderClear;
5. Build for PSP; Run on real hardware or on an emulator.

Expected result

Entire texture is cleared.

Actual result

Only the top-left 480x272 region of the texture is cleared. The results of the earlier draws are visible through the uncleared region.

Why this happens

SDL_RenderClear on PSP uses sceGuClear. This function clears a region as determined by gu_draw_buffer.width and gu_draw_buffer.height.
These values are set by the function sceGuDispBuffer, which only gets called by SDL in PSP_CreateRenderer, and passed PSP_SCREEN_WIDTH and PSP_SCREEN_HEIGHT, which are 480 and 272 respectively.

main.c
CMakeLists.txt

[slouken]

@sharkwouter, can you take a look at this?

[sharkwouter]

Thanks for the detailed report. I will look into this.