Wind Shader

@Toemsel wrote:

It is hard to get into shader programming. Can anyone recommend me a book or site? I did search for hours and the only thing I got working was this

However, the image crops of. I guess, because the texCoords did change and thus the tex2d() can't read the corresponding pixel anymore. How can I avoid the image crop and the weired extension on the left side? My source so far.

#if OPENGL
	#define SV_POSITION POSITION
	#define VS_SHADERMODEL vs_3_0
	#define PS_SHADERMODEL ps_3_0
#else
	#define VS_SHADERMODEL vs_4_0_level_9_1
	#define PS_SHADERMODEL ps_4_0_level_9_1
#endif

Texture2D SpriteTexture;
sampler2D SpriteTextureSampler = sampler_state
{
	Texture = <SpriteTexture>;
};

float4x4 projectionMatrix;
float4x4 viewMatrix;

float gameTime = 1.0;
float bendEnd = 0.5;
float minValue = 0.1;
float strength = 0.005;

struct PixelShaderOutput
{
	float4 Color: COLOR0;
};

struct VertexShaderOutput
{
	float4 Position : SV_POSITION;
	float2 TexCoord : TEXCOORD0;
	float4 Color: COLOR0;
};

VertexShaderOutput VertexShaderLogic(float4 position : SV_POSITION, float4 color : COLOR0, float2 texCoord : TEXCOORD0)
{
	VertexShaderOutput output = (VertexShaderOutput)0;

	output.Position = mul(position, viewMatrix);
	output.Position = mul(output.Position, projectionMatrix);
	output.TexCoord = texCoord;
	output.Color = color;

	if (output.TexCoord.y < bendEnd)
		output.TexCoord.x += minValue + sin(gameTime) * strength;

	return output;
}

PixelShaderOutput PixelShaderFunction(VertexShaderOutput input) : COLOR0
{
	PixelShaderOutput output = (PixelShaderOutput)0;

	output.Color = tex2D(SpriteTextureSampler, input.TexCoord) * input.Color;

	return output;
}

float nrand(float2 uv)
{
	return frac(sin(dot(uv, float2(12.9898, 78.233))) * 43758.5453);
}

technique SpriteDrawing
{
	pass P0
	{
		VertexShader = compile VS_SHADERMODEL VertexShaderLogic();
		PixelShader = compile PS_SHADERMODEL PixelShaderFunction();
	}
};

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