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Viewport scaling and display density independence

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The view is scaled to be as large as possible, without changing the aspect, within the bounds of the window.
On "retina" displays, or other displays where window units != pixels, the view should no longer draw incorrectly.
This commit is contained in:
Kevin Hartman 2014-08-29 22:23:12 -07:00 • committed by Tony Wasserka
parent c8d933a142
commit 221a9b023d
7 changed files with 89 additions and 4 deletions
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36
src/video_core/renderer_opengl/renderer_opengl.cpp
View file

@ -191,7 +191,8 @@ void RendererOpenGL::DrawSingleScreenRotated(const TextureInfo& texture, float x
* Draws the emulated screens to the emulator window.
*/
void RendererOpenGL::DrawScreens() {
glViewport(0, 0, resolution_width, resolution_height);
UpdateViewportExtent();
glViewport(viewport_extent.x, viewport_extent.y, viewport_extent.width, viewport_extent.height);
glClear(GL_COLOR_BUFFER_BIT);
glUseProgram(program_id);
@ -228,6 +229,39 @@ void RendererOpenGL::SetWindow(EmuWindow* window) {
render_window = window;
}
void RendererOpenGL::UpdateViewportExtent() {
int width_in_pixels;
int height_in_pixels;
render_window->GetFramebufferSize(&width_in_pixels, &height_in_pixels);
// No update needed if framebuffer size hasn't changed
if (width_in_pixels == framebuffer_size.width && height_in_pixels == framebuffer_size.height) {
return;
}
framebuffer_size.width = width_in_pixels;
framebuffer_size.height = height_in_pixels;
float window_aspect_ratio = static_cast<float>(height_in_pixels) / width_in_pixels;
float emulation_aspect_ratio = static_cast<float>(resolution_height) / resolution_width;
if (window_aspect_ratio > emulation_aspect_ratio) {
// If the window is more narrow than the emulation content, borders are applied on the
// top and bottom of the window.
viewport_extent.width = width_in_pixels;
viewport_extent.height = emulation_aspect_ratio * viewport_extent.width;
viewport_extent.x = 0;
viewport_extent.y = (height_in_pixels - viewport_extent.height) / 2;
} else {
// Otherwise, borders are applied on the left and right sides of the window.
viewport_extent.height = height_in_pixels;
viewport_extent.width = (1 / emulation_aspect_ratio) * viewport_extent.height;
viewport_extent.x = (width_in_pixels - viewport_extent.width) / 2;
viewport_extent.y = 0;
}
}
/// Initialize the renderer
void RendererOpenGL::Init() {
render_window->MakeCurrent();

15
src/video_core/renderer_opengl/renderer_opengl.h
View file

@ -52,12 +52,27 @@ private:
static void LoadFBToActiveGLTexture(const GPU::Regs::FramebufferConfig& framebuffer,
const TextureInfo& texture);
/// Updates the viewport rectangle
void UpdateViewportExtent();
EmuWindow* render_window; ///< Handle to render window
u32 last_mode; ///< Last render mode
int resolution_width; ///< Current resolution width
int resolution_height; ///< Current resolution height
struct {
int width;
int height;
} framebuffer_size; ///< Current framebuffer size
struct {
int x;
int y;
int width;
int height;
} viewport_extent; ///< Current viewport rectangle
// OpenGL object IDs
GLuint vertex_array_handle;
GLuint vertex_buffer_handle;