Fix unsupported sampler filter used for voxel GI

(cherry picked from commit 09aa1bbdb3c9dc4891a192854636a4e33ccd46bc)

2 files changed, 11 insertions, 1 deletions

diff --git a/servers/rendering/renderer_rd/environment/gi.cpp b/servers/rendering/renderer_rd/environment/gi.cpp
index fd7975ed3a..52f09e1ccb 100644
--- a/servers/rendering/renderer_rd/environment/gi.cpp
+++ b/servers/rendering/renderer_rd/environment/gi.cpp
@@ -3493,6 +3493,9 @@ void GI::init(SkyRD *p_sky) {
 		if (RendererSceneRenderRD::get_singleton()->is_vrs_supported()) {
 			defines += "\n#define USE_VRS\n";
 		}
+		if (!RD::get_singleton()->sampler_is_format_supported_for_filter(RD::DATA_FORMAT_R8G8_UINT, RD::SAMPLER_FILTER_LINEAR)) {
+			defines += "\n#define SAMPLE_VOXEL_GI_NEAREST\n";
+		}
 
 		Vector<String> gi_modes;
 
@@ -3931,7 +3934,6 @@ void GI::process_gi(Ref<RenderSceneBuffersRD> p_render_buffers, const RID *p_nor
 				u.append_id(material_storage->sampler_rd_get_default(RS::CANVAS_ITEM_TEXTURE_FILTER_LINEAR_WITH_MIPMAPS, RS::CANVAS_ITEM_TEXTURE_REPEAT_DISABLED));
 				uniforms.push_back(u);
 			}
-
 			{
 				RD::Uniform u;
 				u.uniform_type = RD::UNIFORM_TYPE_IMAGE;
diff --git a/servers/rendering/renderer_rd/shaders/environment/gi.glsl b/servers/rendering/renderer_rd/shaders/environment/gi.glsl
index 459c4dcb1d..59af9501ba 100644
--- a/servers/rendering/renderer_rd/shaders/environment/gi.glsl
+++ b/servers/rendering/renderer_rd/shaders/environment/gi.glsl
@@ -4,6 +4,10 @@
 
 #VERSION_DEFINES
 
+#ifdef SAMPLE_VOXEL_GI_NEAREST
+#extension GL_EXT_samplerless_texture_functions : enable
+#endif
+
 layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
 
 #define M_PI 3.141592
@@ -625,7 +629,11 @@ void process_gi(ivec2 pos, vec3 vertex, inout vec4 ambient_light, inout vec4 ref
 
 #ifdef USE_VOXEL_GI_INSTANCES
 		{
+#ifdef SAMPLE_VOXEL_GI_NEAREST
+			uvec2 voxel_gi_tex = texelFetch(voxel_gi_buffer, pos, 0).rg;
+#else
 			uvec2 voxel_gi_tex = texelFetch(usampler2D(voxel_gi_buffer, linear_sampler), pos, 0).rg;
+#endif
 			roughness *= roughness;
 			//find arbitrary tangent and bitangent, then build a matrix
 			vec3 v0 = abs(normal.z) < 0.999 ? vec3(0.0, 0.0, 1.0) : vec3(0.0, 1.0, 0.0);