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hey everyone,

im trying to apply shadows in my d3d9 game.Shadows should be seen only on terrain not object meshes.

my main render func like this;

renderterrain()
renderobjectmeshes()
rendercharacter()
.
.
.

i got the shadow map texture with depth pass to my pixel shader.Shadow map is fully correct i double checked it.
so than next thing to do is show shadows on terrain.

i tried like this;
1-set the depth pass pixel and vertex shader to get shadow map
2-get shadow map with depth pass
3-restore render target and depth stencil buffer
4-set shadow texture to 2nd slot (settexture(2,g_tShadowMap)
5-set the pixel shader for show the shadows and i set the vertex shader null cause i think no need vertex shader for render my terrain at least for now.
6-render terrain

result : all the terrain just dark and i can't debug my pixel shader pix gives me error with D3D_INVALIDCALL

my terrain has multi textures so i used lerp in pixel shader

this is my pixel shader for scene 

struct PS_INPUT
{
	float4 Position : POSITION;
	float2 UV : TEXCOORD0;
	float3 Normal : TEXCOORD1;
	float4 LightViewPosition : TEXCOORD2;
};

#ifdef USE_SHADOWS
#if defined(SOFT_SHADOWS)
static const float2 PCF_Offset_16x[16] = {
		float2(-1.5f, -1.5f),
		float2(-1.5f, -0.5f),
		float2(-1.5f, 0.5f),
		float2(-1.5f, 1.5f),
		
		float2(-0.5f, -1.5f),
		float2(-0.5f, -0.5f),
		float2(-0.5f, 0.5f),
		float2(-0.5f, 1.5f),
		
		float2(0.5f, -1.5f),
		float2(0.5f, -0.5f),
		float2(0.5f, 0.5f),
		float2(0.5f, 1.5f),
		
		float2(1.5f, -1.5f),
		float2(1.5f, -0.5f),
		float2(1.5f, 0.5f),
		float2(1.5f, 1.5f),
		
};
#define PCF_SAMPLE_COUNT 16
#define PCF_SAMPLE_ARRAY PCF_Offset_16x
#else
#define PCF_SAMPLE_COUNT 1
static const float2 PCF_Offset_1x[1] = {
		float2(0.0f, 0.0f),
};
#define PCF_SAMPLE_ARRAY PCF_Offset_1x
#endif

sampler2D ShadowMap : register(s2);
float4 ShadowMapTexelSize : register(c4);
#endif

float3 MaterialDiffuse : register(c0);
float3 LightDirection : register(c1);
float4 LightDiffuse : register(c2);
float4 AmbientColor : register(c3);


sampler2D DiffuseTexture : register(s0);
sampler2D DiffuseTexture2 : register(s1);


float2 clipSpaceToTextureSpace(float4 clipSpace)
{
	float2 cs = clipSpace.xy/* / clipSpace.w*/; 
	return float2(0.5f * cs.x, -0.5f * cs.y) + 0.5f;
}

float4 main(PS_INPUT input) : SV_TARGET
{
	float4 Color = tex2D(DiffuseTexture, input.UV);
	float4 Color2 = tex2D(DiffuseTexture2,input.UV);
	Color = lerp(Color,Color2,0.5);
	if (Color.a < 0.33f)
		discard;
	
	float LightIntensity = saturate(dot(normalize(input.Normal), LightDirection));
	float3 LightResult = ((MaterialDiffuse * LightDiffuse.rgb * LightDiffuse.a) * LightIntensity);
	
#ifdef USE_SHADOWS
	const float ShadowBias = ShadowMapTexelSize.z;
	float Shadow = 1.0f;
	const float2 LightTexCoord = clipSpaceToTextureSpace(input.LightViewPosition);
	const float fCurrDepth = input.LightViewPosition.z;

	if (saturate(LightTexCoord.x) == LightTexCoord.x
		&& saturate(LightTexCoord.y) == LightTexCoord.y
		&& saturate(fCurrDepth) == fCurrDepth)
	{
		Shadow = 0.0f;

#if PCF_SAMPLE_COUNT > 1
		[loop]
		for (uint pcf = 0; pcf < PCF_SAMPLE_COUNT; pcf++)
#else
		uint pcf = 0;
#endif
		{
			float SampledDepth = tex2D(ShadowMap, LightTexCoord + (PCF_SAMPLE_ARRAY[pcf] * ShadowMapTexelSize.xy)).r;
		
			if (fCurrDepth - ShadowBias > SampledDepth)
				Shadow += 1.0f;
		}

		Shadow = 1.0f - (Shadow / PCF_SAMPLE_COUNT);
		LightResult *= Shadow;
	}
#endif

	Color.rgb *= LightResult;
	Color.rgb += (AmbientColor.rgb * AmbientColor.a);
	return Color;
}



hope someone can help me :(

sorry for poor english