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LibGL: Fix scissor box coordinate system

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We were working with (0, 0) being the top-left of the render target,
but `glScissor` documentation states that this should be the
bottom-left instead.
This commit is contained in:
Jelle Raaijmakers 2021-11-28 22:27:49 +01:00 committed by Andreas Kling
parent e967d31a98
commit 930782a155
Notes: sideshowbarker 2024-07-17 22:57:28 +09:00 
Author: https://github.com/gmta
Commit: https://github.com/SerenityOS/serenity/commit/930782a1552
Pull-request: https://github.com/SerenityOS/serenity/pull/11108
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/sunverwerth ✅
1 changed files with 8 additions and 3 deletions
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11
Userland/Libraries/LibGL/SoftwareRasterizer.cpp
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@ -54,6 +54,11 @@ static FloatVector4 to_vec4(Gfx::RGBA32 rgba)
};
}
static Gfx::IntRect scissor_box_to_window_coordinates(Gfx::IntRect const& scissor_box, Gfx::IntRect const& window_rect)
{
return scissor_box.translated(0, window_rect.height() - 2 * scissor_box.y() - scissor_box.height());
}
static constexpr void setup_blend_factors(GLenum mode, FloatVector4& constant, float& src_alpha, float& dst_alpha, float& src_color, float& dst_color)
{
constant = { 0.0f, 0.0f, 0.0f, 0.0f };
@ -185,7 +190,7 @@ static void rasterize_triangle(const RasterizerOptions& options, Gfx::Bitmap& re
// Calculate block-based bounds
auto render_bounds = render_target.rect();
if (options.scissor_enabled)
render_bounds.intersect(options.scissor_box);
render_bounds.intersect(scissor_box_to_window_coordinates(options.scissor_box, render_target.rect()));
int const block_padding = RASTERIZER_BLOCK_SIZE - 1;
// clang-format off
int const bx0 = max(render_bounds.left(), min(min(v0.x(), v1.x()), v2.x())) / RASTERIZER_BLOCK_SIZE;
@ -576,7 +581,7 @@ void SoftwareRasterizer::clear_color(const FloatVector4& color)
if (m_options.scissor_enabled) {
auto fill_rect = m_render_target->rect();
fill_rect.intersect(m_options.scissor_box);
fill_rect.intersect(scissor_box_to_window_coordinates(m_options.scissor_box, fill_rect));
Gfx::Painter painter { *m_render_target };
painter.fill_rect(fill_rect, fill_color);
return;
@ -590,7 +595,7 @@ void SoftwareRasterizer::clear_depth(float depth)
wait_for_all_threads();
if (m_options.scissor_enabled) {
m_depth_buffer->clear(m_options.scissor_box, depth);
m_depth_buffer->clear(scissor_box_to_window_coordinates(m_options.scissor_box, m_render_target->rect()), depth);
return;
}