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LibGL+LibSoftGPU: Implement viewport support

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This implements the `glViewport` API call, the coordinate
transformation and the `GL_VIEWPORT` context parameter.
This commit is contained in:
Jelle Raaijmakers 2022-01-08 14:43:03 +01:00 • committed by Linus Groh
parent d236b0ed12
commit 29bbf56286
4 changed files with 33 additions and 13 deletions
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18
Userland/Libraries/LibSoftGPU/Device.cpp
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@ -468,6 +468,7 @@ Device::Device(const Gfx::IntSize& size)
, m_depth_buffer { adopt_own(*new DepthBuffer(size)) }
{
m_options.scissor_box = m_render_target->rect();
m_options.viewport = m_render_target->rect();
}
DeviceInfo Device::info() const
@ -561,9 +562,6 @@ void Device::draw_primitives(PrimitiveType primitive_type, FloatMatrix4x4 const&
m_enabled_texture_units = enabled_texture_units;
float scr_width = m_render_target->width();
float scr_height = m_render_target->height();
m_triangle_list.clear_with_capacity();
m_processed_triangles.clear_with_capacity();
@ -621,6 +619,11 @@ void Device::draw_primitives(PrimitiveType primitive_type, FloatMatrix4x4 const&
}
// Now let's transform each triangle and send that to the GPU
auto const viewport = window_coordinates_to_target_coordinates(m_options.viewport, m_render_target->rect());
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;
for (auto& triangle : m_triangle_list) {
@ -663,12 +666,11 @@ void Device::draw_primitives(PrimitiveType primitive_type, FloatMatrix4x4 const&
one_over_w,
};
// To window coordinates
// FIXME: implement viewport functionality
// To window coordinates - note that we flip the Y coordinate into target space
vec.window_coordinates = {
scr_width / 2 + ndc_coordinates.x() * scr_width / 2,
scr_height / 2 - ndc_coordinates.y() * scr_height / 2,
depth_half_range * ndc_coordinates.z() + depth_halfway,
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(),
};
}