Remove unused struct fields in VoxelGIData

This reduces the struct size from 112 bytes to 96 bytes.

servers/rendering/renderer_rd/renderer_scene_gi_rd.h

@@ -602,19 +602,15 @@ public:
 	};
 
 	struct VoxelGIData {
-		float xform[16];
-		float bounds[3];
-		float dynamic_range;
+		float xform[16]; // 64 - 64
 
-		float bias;
-		float normal_bias;
-		uint32_t blend_ambient;
-		uint32_t texture_slot;
+		float bounds[3]; // 12 - 76
+		float dynamic_range; // 4 - 80
 
-		uint32_t pad0;
-		uint32_t pad1;
-		uint32_t pad2;
-		uint32_t mipmaps;
+		float bias; // 4 - 84
+		float normal_bias; // 4 - 88
+		uint32_t blend_ambient; // 4 - 92
+		uint32_t mipmaps; // 4 - 96
 	};
 
 	struct PushConstant {

servers/rendering/renderer_rd/shaders/gi.glsl

@@ -68,19 +68,15 @@ sdfgi;
 #define MAX_VOXEL_GI_INSTANCES 8
 
 struct VoxelGIData {
-	mat4 xform;
-	vec3 bounds;
-	float dynamic_range;
+	mat4 xform; // 64 - 64
 
-	float bias;
-	float normal_bias;
-	bool blend_ambient;
-	uint texture_slot;
+	vec3 bounds; // 12 - 76
+	float dynamic_range; // 4 - 80
 
-	uint pad0;
-	uint pad1;
-	uint pad2;
-	uint mipmaps;
+	float bias; // 4 - 84
+	float normal_bias; // 4 - 88
+	bool blend_ambient; // 4 - 92
+	uint mipmaps; // 4 - 96
 };
 
 layout(set = 0, binding = 16, std140) uniform VoxelGIs {

servers/rendering/renderer_rd/shaders/scene_forward_clustered_inc.glsl

@@ -305,19 +305,15 @@ layout(set = 1, binding = 15) uniform texture2DArray sdfgi_lightprobe_texture;
 layout(set = 1, binding = 16) uniform texture3D sdfgi_occlusion_cascades;
 
 struct VoxelGIData {
-	mat4 xform;
-	vec3 bounds;
-	float dynamic_range;
+	mat4 xform; // 64 - 64
 
-	float bias;
-	float normal_bias;
-	bool blend_ambient;
-	uint texture_slot;
+	vec3 bounds; // 12 - 76
+	float dynamic_range; // 4 - 80
 
-	float anisotropy_strength;
-	float ambient_occlusion;
-	float ambient_occlusion_size;
-	uint mipmaps;
+	float bias; // 4 - 84
+	float normal_bias; // 4 - 88
+	bool blend_ambient; // 4 - 92
+	uint mipmaps; // 4 - 96
 };
 
 layout(set = 1, binding = 17, std140) uniform VoxelGIs {

servers/rendering/renderer_rd/shaders/volumetric_fog_process.glsl

@@ -76,19 +76,15 @@ layout(set = 0, binding = 10) uniform sampler shadow_sampler;
 #define MAX_VOXEL_GI_INSTANCES 8
 
 struct VoxelGIData {
-	mat4 xform;
-	vec3 bounds;
-	float dynamic_range;
+	mat4 xform; // 64 - 64
 
-	float bias;
-	float normal_bias;
-	bool blend_ambient;
-	uint texture_slot;
+	vec3 bounds; // 12 - 76
+	float dynamic_range; // 4 - 80
 
-	float anisotropy_strength;
-	float ambient_occlusion;
-	float ambient_occlusion_size;
-	uint mipmaps;
+	float bias; // 4 - 84
+	float normal_bias; // 4 - 88
+	bool blend_ambient; // 4 - 92
+	uint mipmaps; // 4 - 96
 };
 
 layout(set = 0, binding = 11, std140) uniform VoxelGIs {