DRW: Split ViewProjectionMatrix in order to increase precision

This also removes the need to compute the persmat and saves some memory
from the `ViewInfos` struct. This is needed to allow multiview support.

Initial testing found no major performance regression during vertex
heavy workload.

Test file: {F13610017}

Results:
| Platform | Master | Split Matrix|
| Linux + Mesa + AMD W6600 | 48 fps | 47 fps |
| Macbook Pro M1 | 50 fps | 51 fps |
| Linux + NVidia 1080Ti | 51 fps | 52 fps |
| Linux + Radeon Vega 64 | 25.6 fps | 26.7 fps |

Increased precision when far from origin:
{F13610024}

{F13610025}

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D16125

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/draw/engines/eevee/shaders/object_motion_vert.glsl b/source/blender/draw/engines/eevee/shaders/object_motion_vert.glsl
index ef96bcbaedb..9dab04006a8 100644
--- a/source/blender/draw/engines/eevee/shaders/object_motion_vert.glsl
+++ b/source/blender/draw/engines/eevee/shaders/object_motion_vert.glsl
@@ -52,8 +52,8 @@ void main()
   /* Use jittered projmatrix to be able to match exact sample depth (depth equal test).
    * Note that currModelMatrix needs to also be equal to ModelMatrix for the samples to match. */
 #ifndef HAIR
-  gl_Position = ViewProjectionMatrix * vec4(currWorldPos, 1.0);
+  gl_Position = ProjectionMatrix * (ViewMatrix * vec4(currWorldPos, 1.0));
 #else
-  gl_Position = ViewProjectionMatrix * vec4(wpos, 1.0);
+  gl_Position = ProjectionMatrix * (ViewMatrix * vec4(wpos, 1.0));
 #endif
 }