example shadow

Linux/App/example/shader/glsl/default3d_forward_shadow_depth.frag

@@ -0,0 +1,68 @@
+//	Copyright (c) 2008-2023 Ryo Suzuki.
+//	Copyright (c) 2016-2023 OpenSiv3D Project.
+//	Licensed under the MIT License.
+
+# version 410
+
+//
+//	Textures
+//
+uniform sampler2D Texture0;
+
+//
+//	PSInput
+//
+layout(location = 0) in vec3 WorldPosition;
+layout(location = 1) in vec2 UV;
+layout(location = 2) in vec3 Normal;
+
+//
+//	PSOutput
+//
+layout(location = 0) out vec2 FragColor;
+
+//
+//	Constant Buffer
+//
+layout(std140) uniform PSPerFrame // slot 0
+{
+	vec3 g_globalAmbientColor;
+	vec3 g_sunColor;
+	vec3 g_sunDirection;
+};
+
+layout(std140) uniform PSPerView // slot 1
+{
+	vec3 g_eyePosition;
+};
+
+layout(std140) uniform PSPerMaterial // slot 3
+{
+	vec3  g_ambientColor;
+	uint  g_hasTexture;
+	vec4  g_diffuseColor;
+	vec3  g_specularColor;
+	float g_shininess;
+	vec3  g_emissionColor;
+};
+
+////////////////////////////////////////////////////////////
+//
+//	Depth
+//
+
+layout(std140) uniform PSShadow // slot 4
+{
+	mat4x4 g_worldToProjectedShadow;
+	vec3 g_sunPosition;
+	float g_lightBleedingReduction;
+};
+
+void main()
+{
+	float depth = length(g_sunPosition - WorldPosition);
+	FragColor = vec2(depth, (depth * depth));
+}
+
+//
+////////////////////////////////////////////////////////////

Linux/App/example/shader/glsl/default3d_forward_shadow_shading.frag

@@ -0,0 +1,150 @@
+//	Copyright (c) 2008-2023 Ryo Suzuki.
+//	Copyright (c) 2016-2023 OpenSiv3D Project.
+//	Licensed under the MIT License.
+
+# version 410
+
+//
+//	Textures
+//
+uniform sampler2D Texture0;
+
+//
+//	PSInput
+//
+layout(location = 0) in vec3 WorldPosition;
+layout(location = 1) in vec2 UV;
+layout(location = 2) in vec3 Normal;
+
+//
+//	PSOutput
+//
+layout(location = 0) out vec4 FragColor;
+
+//
+//	Constant Buffer
+//
+layout(std140) uniform PSPerFrame // slot 0
+{
+	vec3 g_globalAmbientColor;
+	vec3 g_sunColor;
+	vec3 g_sunDirection;
+};
+
+layout(std140) uniform PSPerView // slot 1
+{
+	vec3 g_eyePosition;
+};
+
+layout(std140) uniform PSPerMaterial // slot 3
+{
+	vec3  g_ambientColor;
+	uint  g_hasTexture;
+	vec4  g_diffuseColor;
+	vec3  g_specularColor;
+	float g_shininess;
+	vec3  g_emissionColor;
+};
+
+//
+//	Functions
+//
+vec4 GetDiffuseColor(vec2 uv)
+{
+	vec4 diffuseColor = g_diffuseColor;
+
+	if (g_hasTexture == 1)
+	{
+		diffuseColor *= texture(Texture0, uv);
+	}
+
+	return diffuseColor;
+}
+
+vec3 CalculateDiffuseReflection(vec3 n, vec3 l, vec3 lightColor, vec3 diffuseColor, vec3 ambientColor)
+{
+	vec3 directColor = lightColor * max(dot(n, l), 0.0f);
+	return ((ambientColor + directColor) * diffuseColor);
+}
+
+vec3 CalculateSpecularReflection(vec3 n, vec3 h, float shininess, float nl, vec3 lightColor, vec3 specularColor)
+{
+	float highlight = pow(max(dot(n, h), 0.0f), shininess) * float(0.0f < nl);
+	return (lightColor * specularColor * highlight);
+}
+
+////////////////////////////////////////////////////////////
+//
+//	Shading
+//
+
+uniform sampler2D Texture1;
+
+layout(std140) uniform PSShadow // slot 4
+{
+	mat4x4 g_worldToProjectedShadow;
+	vec3 g_sunPosition;
+	float g_lightBleedingReduction;
+};
+
+float LineStep(float min, float max, float value)
+{
+	return clamp((value - min) / (max - min), 0.0, 1.0);
+}
+
+float ReduceLightBleeding(float p_max, float amount)
+{
+	return LineStep(amount, 1.0, p_max);
+}
+
+float CalculateShadow(vec3 worldPosition)
+{
+	vec4 projectedPosition = (vec4(worldPosition, 1.0) * g_worldToProjectedShadow);
+
+	if (any(notEqual(clamp(projectedPosition.xyz, 0.0, 1.0), projectedPosition.xyz)))
+	{
+		return 1.0;
+	}
+
+	vec2 uv = vec2(projectedPosition.x, (1.0 - projectedPosition.y));
+	float depth = (length(g_sunPosition - worldPosition) - 0.03125);
+	vec2 moments = texture(Texture1, uv).rg;
+
+	if (depth <= moments.x)
+	{
+		return 1.0;
+	}
+
+	float variance = (moments.y - (moments.x * moments.x));
+	float d = (moments.x - depth);
+	float lit = (variance / (variance + (d * d)));
+
+	return ReduceLightBleeding(lit, g_lightBleedingReduction);
+}
+
+void main()
+{
+	// Shadow
+	float lit = CalculateShadow(WorldPosition);
+
+	vec3 lightColor		= (g_sunColor * lit);
+	vec3 lightDirection	= g_sunDirection;
+
+	vec3 n = normalize(Normal);
+	vec3 l = lightDirection;
+	vec4 diffuseColor = GetDiffuseColor(UV);
+	vec3 ambientColor = (g_ambientColor * g_globalAmbientColor);
+
+	// Diffuse
+	vec3 diffuseReflection = CalculateDiffuseReflection(n, l, lightColor, diffuseColor.rgb, ambientColor);
+
+	// Specular
+	vec3 v = normalize(g_eyePosition - WorldPosition);
+	vec3 h = normalize(v + lightDirection);
+	vec3 specularReflection = CalculateSpecularReflection(n, h, g_shininess, dot(n, l), lightColor, g_specularColor);
+
+	FragColor = vec4(diffuseReflection + specularReflection + g_emissionColor, diffuseColor.a);
+}
+
+//
+////////////////////////////////////////////////////////////

Linux/App/example/shader/hlsl/default3d_forward_shadow.hlsl

@@ -0,0 +1,166 @@
+//-----------------------------------------------
+//
+//	This file is part of the Siv3D Engine.
+//
+//	Copyright (c) 2008-2023 Ryo Suzuki
+//	Copyright (c) 2016-2023 OpenSiv3D Project
+//
+//	Licensed under the MIT License.
+//
+//-----------------------------------------------
+
+//
+//	Textures
+//
+Texture2D g_texture0 : register(t0);
+SamplerState g_sampler0 : register(s0);
+
+namespace s3d
+{
+	//
+	//	VS Output / PS Input
+	//
+	struct PSInput
+	{
+		float4 position : SV_POSITION;
+		float3 worldPosition : TEXCOORD0;
+		float2 uv : TEXCOORD1;
+		float3 normal : TEXCOORD2;
+	};
+}
+
+//
+//	Constant Buffer
+//
+cbuffer PSPerFrame : register(b0)
+{
+	float3 g_globalAmbientColor;
+	float3 g_sunColor;
+	float3 g_sunDirection;
+}
+
+cbuffer PSPerView : register(b1)
+{
+	float3 g_eyePosition;
+}
+
+cbuffer PSPerMaterial : register(b3)
+{
+	float3 g_ambientColor;
+	uint g_hasTexture;
+	float4 g_diffuseColor;
+	float3 g_specularColor;
+	float g_shininess;
+	float3 g_emissionColor;
+}
+
+float4 GetDiffuseColor(float2 uv)
+{
+	float4 diffuseColor = g_diffuseColor;
+
+	if (g_hasTexture)
+	{
+		diffuseColor *= g_texture0.Sample(g_sampler0, uv);
+	}
+
+	return diffuseColor;
+}
+
+float3 CalculateDiffuseReflection(float3 n, float3 l, float3 lightColor, float3 diffuseColor, float3 ambientColor)
+{
+	const float3 directColor = lightColor * saturate(dot(n, l));
+	return ((ambientColor + directColor) * diffuseColor);
+}
+
+float3 CalculateSpecularReflection(float3 n, float3 h, float shininess, float nl, float3 lightColor, float3 specularColor)
+{
+	const float highlight = pow(saturate(dot(n, h)), shininess) * float(0.0 < nl);
+	return (lightColor * specularColor * highlight);
+}
+
+////////////////////////////////////////////////////////////
+//
+//	Depth
+//
+cbuffer PSShadow : register(b4)
+{
+	row_major float4x4 g_worldToProjectedShadow;
+	float3 g_sunPosition;
+	float g_lightBleedingReduction;
+}
+
+float2 Depth_PS(s3d::PSInput input) : SV_TARGET
+{
+	const float depth = length(g_sunPosition - input.worldPosition);
+	return float2(depth, (depth * depth));
+}
+//
+////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////
+//
+//	Shading
+//
+Texture2D g_texture1 : register(t1);
+SamplerState g_sampler1 : register(s1);
+
+float LineStep(float min, float max, float value)
+{
+	return saturate((value - min) / (max - min));
+}
+
+float ReduceLightBleeding(float p_max, float amount)
+{
+	return LineStep(amount, 1.0, p_max);
+}
+
+float CalculateShadow(float3 worldPosition)
+{
+	const float4 projectedPosition = mul(float4(worldPosition, 1.0), g_worldToProjectedShadow);
+
+	if (any(saturate(projectedPosition.xyz) != projectedPosition.xyz))
+	{
+		return 1.0;
+	}
+
+	const float2 uv = float2(projectedPosition.x, (1.0 - projectedPosition.y));
+	const float depth = (length(g_sunPosition - worldPosition) - 0.03125);
+	const float2 moments = g_texture1.Sample(g_sampler1, uv).rg;
+
+	if (depth <= moments.x)
+	{
+		return 1.0;
+	}
+
+	const float variance = (moments.y - (moments.x * moments.x));
+	const float d = (moments.x - depth);
+	const float lit = (variance / (variance + (d * d)));
+
+	return ReduceLightBleeding(lit, g_lightBleedingReduction);
+}
+
+float4 Shading_PS(s3d::PSInput input) : SV_TARGET
+{
+	// Shadow
+	const float lit = CalculateShadow(input.worldPosition);
+
+	const float3 lightColor = (g_sunColor * lit);
+	const float3 lightDirection = g_sunDirection;
+
+	const float3 n = normalize(input.normal);
+	const float3 l = lightDirection;
+	float4 diffuseColor = GetDiffuseColor(input.uv);
+	const float3 ambientColor = (g_ambientColor * g_globalAmbientColor);
+
+	// Diffuse
+	const float3 diffuseReflection = CalculateDiffuseReflection(n, l, lightColor, diffuseColor.rgb, ambientColor);
+
+	// Specular
+	const float3 v = normalize(g_eyePosition - input.worldPosition);
+	const float3 h = normalize(v + lightDirection);
+	const float3 specularReflection = CalculateSpecularReflection(n, h, g_shininess, dot(n, l), lightColor, g_specularColor);
+
+	return float4(diffuseReflection + specularReflection + g_emissionColor, diffuseColor.a);
+}
+//
+////////////////////////////////////////////////////////////

Siv3D/include/Siv3D/Mat4x4.hpp

@@ -43,6 +43,9 @@ namespace s3d
 			float m30, float m31, float m32, float m33
 		) noexcept;
 
+		SIV3D_NODISCARD_CXX20
+		explicit Mat4x4(const float* p) noexcept;
+
 		SIV3D_NODISCARD_CXX20
 		explicit Mat4x4(Quaternion q) noexcept;