init

shaders/shadows/main.frag

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+#version 320 es
+/* Copyright (c) 2025, Arm Limited and Contributors
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 the "License";
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define MAX_LIGHT_COUNT 48 
+
+precision highp float;
+precision highp sampler2DShadow;
+
+layout(set = 0, binding = 0) uniform sampler2D base_color_texture;
+
+layout(location = 0) in vec4 in_pos;
+layout(location = 1) in vec2 in_uv;
+layout(location = 2) in vec3 in_normal;
+
+layout(location = 0) out vec4 o_color;
+
+layout(set = 0, binding = 1) uniform GlobalUniform
+{
+	mat4 model;
+	mat4 view_proj;
+	vec3 camera_position;
+}
+global_uniform;
+
+// Push constants come with a limitation in the size of data.
+// The standard requires at least 128 bytes
+layout(push_constant, std430) uniform PBRMaterialUniform
+{
+	vec4  base_color_factor;
+	float metallic_factor;
+	float roughness_factor;
+}
+pbr_material_uniform;
+
+#include "lighting.h"
+
+layout(set = 0, binding = 4) uniform LightsInfo
+{
+	Light directional_lights[MAX_LIGHT_COUNT];
+	Light point_lights[MAX_LIGHT_COUNT];
+	Light spot_lights[MAX_LIGHT_COUNT];
+}
+lights_info;
+
+layout(constant_id = 0) const uint DIRECTIONAL_LIGHT_COUNT = 0U;
+layout(constant_id = 1) const uint POINT_LIGHT_COUNT       = 0U;
+layout(constant_id = 2) const uint SPOT_LIGHT_COUNT        = 0U;
+
+layout(set = 0, binding = 5) uniform sampler2DShadow shadowmap_texture;
+
+layout(set = 0, binding = 6) uniform ShadowUniform
+{
+	mat4 light_matrix;
+}
+shadow_uniform;
+
+float calculate_shadow()
+{
+    vec4 projected_coord = shadow_uniform.light_matrix * vec4(in_pos.xyz, 1.0);
+
+    projected_coord /= projected_coord.w;
+
+    projected_coord.xy = 0.5 * projected_coord.xy + 0.5;
+
+    return texture(shadowmap_texture, vec3(projected_coord.xy, projected_coord.z));
+}
+
+void main(void)
+{
+	vec3 normal = normalize(in_normal);
+
+	vec3 light_contribution = vec3(0.0);
+
+	for (uint i = 0U; i < DIRECTIONAL_LIGHT_COUNT; ++i)
+	{
+		light_contribution += apply_directional_light(lights_info.directional_lights[i], normal);
+
+		// Shadows are enabled for the light source #0
+		if(i == 0U) 
+        {
+            light_contribution *= calculate_shadow();
+        }
+	}
+
+	for (uint i = 0U; i < POINT_LIGHT_COUNT; ++i)
+	{
+		light_contribution += apply_point_light(lights_info.point_lights[i], in_pos.xyz, normal);
+	}
+
+	for (uint i = 0U; i < SPOT_LIGHT_COUNT; ++i)
+	{
+		light_contribution += apply_spot_light(lights_info.spot_lights[i], in_pos.xyz, normal);
+	}
+
+	vec4 base_color = vec4(1.0, 0.0, 0.0, 1.0);
+
+	base_color = texture(base_color_texture, in_uv);
+
+	vec3 ambient_color = vec3(0.2) * base_color.xyz;
+
+	o_color = vec4(ambient_color + light_contribution * base_color.xyz, base_color.w);
+}

shaders/shadows/main.vert

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+#version 320 es
+/* Copyright (c) 2020, Arm Limited and Contributors
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 the "License";
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+layout(location = 0) in vec3 position;
+layout(location = 1) in vec2 texcoord_0;
+layout(location = 2) in vec3 normal;
+
+layout(set = 0, binding = 1) uniform GlobalUniform {
+    mat4 model;
+    mat4 view_proj;
+    vec3 camera_position;
+} global_uniform;
+
+layout (location = 0) out vec4 o_pos;
+layout (location = 1) out vec2 o_uv;
+layout (location = 2) out vec3 o_normal;
+
+void main(void)
+{
+    o_pos = global_uniform.model * vec4(position, 1.0);
+
+    o_uv = texcoord_0;
+
+    o_normal = mat3(global_uniform.model) * normal;
+
+    gl_Position = global_uniform.view_proj * o_pos;
+}

shaders/shadows/shadowmap.frag

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+#version 320 es
+/* Copyright (c) 2020, Arm Limited and Contributors
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 the "License";
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+precision highp float;
+
+void main(void)
+{
+}

shaders/shadows/shadowmap.vert

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+#version 320 es
+/* Copyright (c) 2020, Arm Limited and Contributors
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 the "License";
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+layout(location = 0) in vec3 position;
+
+layout(set = 0, binding = 1) uniform GlobalUniform {
+    mat4 model;
+    mat4 view_proj;
+    vec3 camera_position;
+} global_uniform;
+
+void main(void)
+{
+    vec4 pos = global_uniform.model * vec4(position, 1.0);
+    gl_Position = global_uniform.view_proj * pos;
+}