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LibGL: Use 8x8 block size in SoftwareRasterizer

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This smaller block size allows us to use an `u8` for the pixel mask
during triangle rasterization. These changes result in better FPS in
3DFileViewer, which periodically shoots up to 250-300 FPS on my
machine. Before, the peaks were somewhere in the range of 160-170 FPS.
This commit is contained in:
Jelle Raaijmakers 2021-12-12 21:38:43 +01:00 committed by Brian Gianforcaro
parent 5a649d0fd5
commit f201567153
Notes: sideshowbarker 2024-07-17 22:34:13 +09:00 
Author: https://github.com/gmta
Commit: https://github.com/SerenityOS/serenity/commit/f201567153b
Pull-request: https://github.com/SerenityOS/serenity/pull/11236
Reviewed-by: https://github.com/bgianfo
Reviewed-by: https://github.com/sunverwerth ✅
1 changed files with 3 additions and 3 deletions
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6
Userland/Libraries/LibGL/SoftwareRasterizer.cpp
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@ -15,7 +15,7 @@ namespace GL {
using IntVector2 = Gfx::Vector2<int>;
using IntVector3 = Gfx::Vector3<int>;
static constexpr int RASTERIZER_BLOCK_SIZE = 16;
static constexpr int RASTERIZER_BLOCK_SIZE = 8;
constexpr static int edge_function(const IntVector2& a, const IntVector2& b, const IntVector2& c)
{
@ -199,8 +199,8 @@ static void rasterize_triangle(const RasterizerOptions& options, Gfx::Bitmap& re
int const by1 = (min(render_bounds.bottom(), max(max(v0.y(), v1.y()), v2.y())) + block_padding) / RASTERIZER_BLOCK_SIZE;
// clang-format on
static_assert(RASTERIZER_BLOCK_SIZE < sizeof(int) * 8, "RASTERIZER_BLOCK_SIZE must be smaller than the pixel_mask's width in bits");
int pixel_mask[RASTERIZER_BLOCK_SIZE];
u8 pixel_mask[RASTERIZER_BLOCK_SIZE];
static_assert(RASTERIZER_BLOCK_SIZE <= sizeof(decltype(*pixel_mask)) * 8, "RASTERIZER_BLOCK_SIZE must be smaller than the pixel_mask's width in bits");
FloatVector4 pixel_buffer[RASTERIZER_BLOCK_SIZE][RASTERIZER_BLOCK_SIZE];