init

shaders/specialization_constants/UBOs.frag

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+#version 320 es
+/* Copyright (c) 2019-2025, 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.
+ */
+
+precision highp float;
+
+#define MAX_LIGHT_COUNT 1
+
+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;
+
+struct Light
+{
+	vec4 position;         // position.w represents type of light
+	vec4 color;            // color.w represents light intensity
+	vec4 direction;        // direction.w represents range
+	vec2 info;             // (only used for spot lights) info.x represents light inner cone angle, info.y represents light outer cone angle
+};
+
+layout(set = 0, binding = 4) uniform LightsInfo
+{
+	uint  count;
+	Light light[MAX_LIGHT_COUNT];
+}
+lights;
+
+// 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;
+
+void main(void)
+{
+	vec3 normal = normalize(in_normal);
+
+	vec3 light_contribution = vec3(0.0);
+
+	for (uint i = 0U; i < lights.count; i++)
+	{
+		vec3 world_to_light = -lights.light[i].direction.xyz;
+
+		world_to_light = normalize(world_to_light);
+
+		float ndotl = clamp(dot(normal, world_to_light), 0.0, 1.0);
+
+		light_contribution += (ndotl * lights.light[i].color.w * lights.light[i].color.rgb);
+	}
+
+	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/specialization_constants/specialization_constants.frag

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+#version 320 es
+/* Copyright (c) 2019-2025, 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.
+ */
+
+precision highp float;
+
+#define MAX_LIGHT_COUNT 1
+
+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;
+
+struct Light
+{
+	vec4 position;         // position.w represents type of light
+	vec4 color;            // color.w represents light intensity
+	vec4 direction;        // direction.w represents range
+	vec2 info;             // (only used for spot lights) info.x represents light inner cone angle, info.y represents light outer cone angle
+};
+
+layout(set = 0, binding = 4) uniform LightsInfo
+{
+	uint  count;
+	Light light[MAX_LIGHT_COUNT];
+}
+lights;
+
+// 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;
+
+layout (constant_id = 0) const uint light_count = 0U;
+
+void main(void)
+{
+	vec3 normal = normalize(in_normal);
+
+	vec3 light_contribution = vec3(0.0);
+
+	for (uint i = 0U; i < light_count; i++)
+	{
+		vec3 world_to_light = -lights.light[i].direction.xyz;
+
+		world_to_light = normalize(world_to_light);
+
+		float ndotl = clamp(dot(normal, world_to_light), 0.0, 1.0);
+
+		light_contribution += (ndotl * lights.light[i].color.w * lights.light[i].color.rgb);
+	}
+
+	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);
+}