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LibGL: Implement glScissor()

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This commit is contained in:
Jelle Raaijmakers 2021-11-27 19:00:16 +01:00 • committed by Brian Gianforcaro
parent 6dd2ebfe8e
commit bb58f6ccab
9 changed files with 83 additions and 10 deletions
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36
Userland/Libraries/LibGL/SoftwareRasterizer.cpp
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@ -183,11 +183,15 @@ 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);
int const block_padding = RASTERIZER_BLOCK_SIZE - 1;
// clang-format off
const int bx0 = max(0, min(min(v0.x(), v1.x()), v2.x()) ) / RASTERIZER_BLOCK_SIZE;
const int bx1 = min(render_target.width(), max(max(v0.x(), v1.x()), v2.x()) + RASTERIZER_BLOCK_SIZE - 1) / RASTERIZER_BLOCK_SIZE;
const int by0 = max(0, min(min(v0.y(), v1.y()), v2.y()) ) / RASTERIZER_BLOCK_SIZE;
const int by1 = min(render_target.height(), max(max(v0.y(), v1.y()), v2.y()) + RASTERIZER_BLOCK_SIZE - 1) / RASTERIZER_BLOCK_SIZE;
int const bx0 = max(render_bounds.left(), min(min(v0.x(), v1.x()), v2.x())) / RASTERIZER_BLOCK_SIZE;
int const bx1 = (min(render_bounds.right(), max(max(v0.x(), v1.x()), v2.x())) + block_padding) / RASTERIZER_BLOCK_SIZE;
int const by0 = max(render_bounds.top(), min(min(v0.y(), v1.y()), v2.y())) / RASTERIZER_BLOCK_SIZE;
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");
@ -229,11 +233,10 @@ static void rasterize_triangle(const RasterizerOptions& options, Gfx::Bitmap& re
int y0 = by * RASTERIZER_BLOCK_SIZE;
// Generate the coverage mask
if (test_point(b0) && test_point(b1) && test_point(b2) && test_point(b3)) {
if (!options.scissor_enabled && test_point(b0) && test_point(b1) && test_point(b2) && test_point(b3)) {
// The block is fully contained within the triangle. Fill the mask with all 1s
for (int y = 0; y < RASTERIZER_BLOCK_SIZE; y++) {
for (int y = 0; y < RASTERIZER_BLOCK_SIZE; y++)
pixel_mask[y] = -1;
}
} else {
// The block overlaps at least one triangle edge.
// We need to test coverage of every pixel within the block.
@ -242,7 +245,7 @@ static void rasterize_triangle(const RasterizerOptions& options, Gfx::Bitmap& re
pixel_mask[y] = 0;
for (int x = 0; x < RASTERIZER_BLOCK_SIZE; x++, coords += dbdx) {
if (test_point(coords))
if (test_point(coords) && (!options.scissor_enabled || render_bounds.contains(x0 + x, y0 + y)))
pixel_mask[y] |= 1 << x;
}
}
@ -481,6 +484,7 @@ SoftwareRasterizer::SoftwareRasterizer(const Gfx::IntSize& min_size)
: m_render_target { Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRA8888, closest_multiple(min_size, RASTERIZER_BLOCK_SIZE)).release_value_but_fixme_should_propagate_errors() }
, m_depth_buffer { adopt_own(*new DepthBuffer(closest_multiple(min_size, RASTERIZER_BLOCK_SIZE))) }
{
m_options.scissor_box = m_render_target->rect();
}
void SoftwareRasterizer::submit_triangle(const GLTriangle& triangle, const Array<TextureUnit, 32>& texture_units)
@ -559,14 +563,28 @@ void SoftwareRasterizer::clear_color(const FloatVector4& color)
uint8_t g = static_cast<uint8_t>(clamp(color.y(), 0.0f, 1.0f) * 255);
uint8_t b = static_cast<uint8_t>(clamp(color.z(), 0.0f, 1.0f) * 255);
uint8_t a = static_cast<uint8_t>(clamp(color.w(), 0.0f, 1.0f) * 255);
auto const fill_color = Gfx::Color(r, g, b, a);
m_render_target->fill(Gfx::Color(r, g, b, a));
if (m_options.scissor_enabled) {
auto fill_rect = m_render_target->rect();
fill_rect.intersect(m_options.scissor_box);
Gfx::Painter painter { *m_render_target };
painter.fill_rect(fill_rect, fill_color);
return;
}
m_render_target->fill(fill_color);
}
void SoftwareRasterizer::clear_depth(float depth)
{
wait_for_all_threads();
if (m_options.scissor_enabled) {
m_depth_buffer->clear(m_options.scissor_box, depth);
return;
}
m_depth_buffer->clear(depth);
}