void SetupDeferredPathway()
{
if (DeferredSetup || !DeferredEnabled)
{
return;
}
DeferredSetup = true;
FBO = new FrameBuffer(Width, Height,
FrameBufferAttachment.Rgb, FrameBufferAttachment.Xyz,
FrameBufferAttachment.Depth);
Resize += (_, __) => FBO.Resize(Width, Height);
QuadVAO = new Vao();
QuadVAO.Attach(new Buffer <uint>(new[] { 0U, 1U, 2U, 3U, 4U, 5U }, BufferTarget.ElementArrayBuffer));
QuadVAO.Attach(new Buffer <float>(new[] {
-1f, -1f,
1f, -1f,
1f, 1f,
-1f, -1f,
1f, 1f,
-1f, 1f
}), (0, typeof(Vector2)));
Program = new Program(@"
#version 410
precision highp float;
in vec2 aPosition;
out vec2 vTexCoord;
void main() {
gl_Position = vec4(aPosition, 0.0, 1.0);
vTexCoord = aPosition.xy * 0.5 + 0.5;
}
" , @"
#version 410
precision highp float;
in vec2 vTexCoord;
struct Light {
vec3 pos, color;
float radius;
};
uniform mat4 uInvProjectionViewMat;
uniform sampler2D uColor, uNormal, uDepth;
uniform vec3 uAmbientColor;
uniform Light uLights[" + maxLights + @"];
uniform int uLightCount;
out vec4 color;
void main() {
gl_FragDepth = texture(uDepth, vTexCoord).x; // Copy depth from FBO to screen depth buffer
vec3 csv = texture(uColor, vTexCoord).rgb;
vec3 normal = normalize(texture(uNormal, vTexCoord).xyz);
vec4 sspos = uInvProjectionViewMat * (vec4(vTexCoord.xy, gl_FragDepth, 1) * 2 - 1);
vec3 pos = sspos.xyz / sspos.w;
vec3 accum = uAmbientColor;
for(int i = 0; i < uLightCount; ++i) {
Light light = uLights[i];
vec3 toLight = light.pos - pos;
float dist = length(toLight);
float intensity = min(max(dot(normal, toLight / dist), 0.0), 1);
accum += light.color * pow(1 - min(dist / light.radius, 1), 3) * intensity;
}
color = vec4(csv * accum, 1);
}
" );
Program.Use();
UniformLocs = Enumerable.Range(0, maxLights).Select(i => new[] {
Program.GetUniform($"uLights[{i}].pos"),
Program.GetUniform($"uLights[{i}].color"),
Program.GetUniform($"uLights[{i}].radius")
}).SelectMany(x => x).ToArray();
UniformLC = Program.GetUniform("uLightCount");
}
void SetupDeferredPathway()
{
Resize += (_, __) => {
if (FBO == null)
{
FBO = new FrameBuffer(Width, Height,
FrameBufferAttachment.Rgba,
FrameBufferAttachment.Depth);
}
else
{
FBO.Resize(Width, Height);
}
};
GL.BindVertexArray(QuadVAO = GL.GenVertexArray());
GL.BindBuffer(BufferTarget.ArrayBuffer, GL.GenBuffer());
GL.BufferData(BufferTarget.ArrayBuffer, 6 * 2 * 4, new[] {
-1f, -1f,
1f, -1f,
1f, 1f,
-1f, -1f,
1f, 1f,
-1f, 1f
}, BufferUsageHint.StaticDraw);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, GL.GenBuffer());
GL.BufferData(BufferTarget.ElementArrayBuffer, 6 * 4, new[] { 0, 1, 2, 3, 4, 5 }, BufferUsageHint.StaticDraw);
GL.EnableVertexAttribArray(0);
GL.VertexAttribPointer(0, 2, VertexAttribPointerType.Float, false, 0, 0);
Program = new Program(@"
#version 410
precision highp float;
in vec2 aPosition;
out vec2 vTexCoord;
void main() {
gl_Position = vec4(aPosition, 0.0, 1.0);
vTexCoord = aPosition.xy * 0.5 + 0.5;
}
" , @"
#version 410
precision highp float;
in vec2 vTexCoord;
struct Light {
vec3 pos, color;
float radius;
};
uniform mat4 uInvProjectionViewMat;
uniform sampler2D uColor, uDepth;
uniform vec3 uAmbientColor;
uniform Light uLights[" + maxLights + @"];
uniform int uLightCount;
out vec3 color;
void main() {
gl_FragDepth = texture(uDepth, vTexCoord).x; // Copy depth from FBO to screen depth buffer
vec3 csv = texture(uColor, vTexCoord).rgb;
vec4 sspos = uInvProjectionViewMat * (vec4(vTexCoord.xy, gl_FragDepth, 1) * 2 - 1);
vec3 pos = sspos.xyz / sspos.w;
vec3 accum = uAmbientColor;
for(int i = 0; i < uLightCount; ++i) {
Light light = uLights[i];
float dist = length(light.pos - pos);
accum += light.color * pow(1 - min(dist / light.radius, 1), 3);
}
color = csv * accum;
}
" );
UniformLocs = Enumerable.Range(0, maxLights).Select(i => new[] {
Program.GetUniform($"uLights[{i}].pos"),
Program.GetUniform($"uLights[{i}].color"),
Program.GetUniform($"uLights[{i}].radius")
}).SelectMany(x => x).ToArray();
UniformLC = Program.GetUniform("uLightCount");
}
