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render: Remove the logical presentation render target.

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Now we render directly to the window, scaling as appropriate. This fixes some
concerns the render target introduced, like the quality of the final scaled
output, how to step outside of the logical size temporarily to draw some
things sharply at the native resolution, and loss of sub-pixel precision.

Fixes #8736.
This commit is contained in:
Ryan C. Gordon
2024-09-16 13:33:16 -04:00
parent bf7a48cdcc
commit 54459def69
16 changed files with 293 additions and 387 deletions
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12
src/render/opengl/SDL_render_gl.c
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@@ -1465,7 +1465,6 @@ static SDL_Surface *GL_RenderReadPixels(SDL_Renderer *renderer, const SDL_Rect *
SDL_PixelFormat format = renderer->target ? renderer->target->format : SDL_PIXELFORMAT_ARGB8888;
GLint internalFormat;
GLenum targetFormat, type;
int w, h;
SDL_Surface *surface;
GL_ActivateRenderer(renderer);
@@ -1480,13 +1479,16 @@ static SDL_Surface *GL_RenderReadPixels(SDL_Renderer *renderer, const SDL_Rect *
return NULL;
}
SDL_GetCurrentRenderOutputSize(renderer, &w, &h);
int y = rect->y;
if (!renderer->target) {
int w, h;
SDL_GetRenderOutputSize(renderer, &w, &h);
y = (h - y) - rect->h;
}
data->glPixelStorei(GL_PACK_ALIGNMENT, 1);
data->glPixelStorei(GL_PACK_ROW_LENGTH, (surface->pitch / SDL_BYTESPERPIXEL(format)));
data->glReadPixels(rect->x, renderer->target ? rect->y : (h - rect->y) - rect->h,
rect->w, rect->h, targetFormat, type, surface->pixels);
data->glReadPixels(rect->x, y, rect->w, rect->h, targetFormat, type, surface->pixels);
if (!GL_CheckError("glReadPixels()", renderer)) {
SDL_DestroySurface(surface);