#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

float4 pColor;
float pAmount;

matrix WorldViewProjection;
sampler s0;

struct VertexShaderInput
{
    float4 Position : POSITION0;
    float4 Color : COLOR0;
};

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

VertexShaderOutput MainVS(in VertexShaderInput input)
{
    VertexShaderOutput output = (VertexShaderOutput) 0;

    output.Position = mul(input.Position, WorldViewProjection);
    output.Color = input.Color;

    return output;
}

float4 MainPS(VertexShaderOutput input) : COLOR
{
    float4 finalColor = tex2D(s0, input.TextureCoordinates);
    return lerp(finalColor, pColor * finalColor.a, pAmount);
}

technique BasicColorDrawing
{
    pass P0
    {
        PixelShader = compile PS_SHADERMODELMainPS();
    }
};