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LibGL+LibSoftGPU: Implement rasterization position

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Implements support for `glRasterPos` and updating the raster position's
window coordinates through `glBitmap`. The input for `glRasterPos` is
an object position that needs to go through the same vertex
transformations as our regular triangles.
This commit is contained in:
Jelle Raaijmakers 2022-01-12 17:07:53 +01:00 • committed by Andreas Kling
parent a4d98c4622
commit ca78327a96
4 changed files with 80 additions and 23 deletions
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57
Userland/Libraries/LibSoftGPU/Device.cpp
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@ -82,7 +82,7 @@ static Vector4<f32x4> to_vec4(u32x4 rgba)
};
}
static Gfx::IntRect window_coordinates_to_target_coordinates(Gfx::IntRect const& window_rect, Gfx::IntRect const& target_rect)
static Gfx::IntRect window_coordinates_to_target_coordinates(Gfx::IntRect const window_rect, Gfx::IntRect const target_rect)
{
return {
window_rect.x(),
@ -977,15 +977,19 @@ void Device::clear_depth(float depth)
m_depth_buffer->clear(depth);
}
void Device::blit(Gfx::Bitmap const& source, int x, int y)
void Device::blit_to_color_buffer_at_raster_position(Gfx::Bitmap const& source)
{
if (!m_raster_position.valid)
return;
wait_for_all_threads();
INCREASE_STATISTICS_COUNTER(g_num_pixels, source.width() * source.height());
INCREASE_STATISTICS_COUNTER(g_num_pixels_shaded, source.width() * source.height());
Gfx::Painter painter { *m_render_target };
painter.blit({ x, y }, source, source.rect(), 1.0f, true);
auto const blit_rect = raster_rect_in_target_coordinates(source.size());
painter.blit({ blit_rect.x(), blit_rect.y() }, source, source.rect(), 1.0f, true);
}
void Device::blit_to(Gfx::Bitmap& target)
@ -1124,4 +1128,51 @@ void Device::set_material_state(unsigned int material_id, Material const& materi
m_materials.at(material_id) = material;
}
void Device::set_raster_position(RasterPosition const& raster_position)
{
m_raster_position = raster_position;
}
void Device::set_raster_position(FloatVector4 const& position, FloatMatrix4x4 const& model_view_transform, FloatMatrix4x4 const& projection_transform)
{
auto const eye_coordinates = model_view_transform * position;
auto const clip_coordinates = projection_transform * eye_coordinates;
// FIXME: implement clipping
m_raster_position.valid = true;
auto ndc_coordinates = clip_coordinates / clip_coordinates.w();
ndc_coordinates.set_w(clip_coordinates.w());
auto const viewport = m_options.viewport;
auto const viewport_half_width = viewport.width() / 2.0f;
auto const viewport_half_height = viewport.height() / 2.0f;
auto const viewport_center_x = viewport.x() + viewport_half_width;
auto const viewport_center_y = viewport.y() + viewport_half_height;
auto const depth_half_range = (m_options.depth_max - m_options.depth_min) / 2;
auto const depth_halfway = (m_options.depth_min + m_options.depth_max) / 2;
// FIXME: implement other raster position properties such as color and texcoords
m_raster_position.window_coordinates = {
viewport_center_x + ndc_coordinates.x() * viewport_half_width,
viewport_center_y + ndc_coordinates.y() * viewport_half_height,
depth_halfway + ndc_coordinates.z() * depth_half_range,
ndc_coordinates.w(),
};
m_raster_position.eye_coordinate_distance = eye_coordinates.length();
}
Gfx::IntRect Device::raster_rect_in_target_coordinates(Gfx::IntSize size)
{
auto const raster_rect = Gfx::IntRect {
static_cast<int>(m_raster_position.window_coordinates.x()),
static_cast<int>(m_raster_position.window_coordinates.y()),
size.width(),
size.height(),
};
return window_coordinates_to_target_coordinates(raster_rect, m_render_target->rect());
}
}