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Fix vulkan projection matrix

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This commit is contained in:
Benau 2022-09-17 16:26:10 +08:00
parent 53351257fc
commit 7199409de4
1 changed files with 7 additions and 5 deletions
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12
lib/graphics_engine/src/ge_vulkan_camera_scene_node.cpp
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@ -30,11 +30,13 @@ void GEVulkanCameraSceneNode::render()
m_ubo_data.m_view_matrix = ViewArea.getTransform(irr::video::ETS_VIEW);
m_ubo_data.m_projection_matrix = ViewArea.getTransform(irr::video::ETS_PROJECTION);
// Irrlicht matrix4 was originally designed for OpenGL,
// where the Y coordinate of the clip coordinates is inverted.
// The easiest way to compensate for that is to flip the sign on the
// scaling factor of the Y axis in the projection matrix.
m_ubo_data.m_projection_matrix(1, 1) *= -1.0f;
// https://matthewwellings.com/blog/the-new-vulkan-coordinate-system/
// Vulkan clip space has inverted Y and half Z
irr::core::matrix4 clip;
clip[5] = -1.0f;
clip[10] = 0.5f;
clip[14] = 0.5f;
m_ubo_data.m_projection_matrix = clip * m_ubo_data.m_projection_matrix;
GEVulkanDriver* vk = getVKDriver();
if (!vk->getRTTTexture())
{