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[update] Implemented a clipping post effect.

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This commit is contained in:
falsycat 2019-10-09 00:00:00 +00:00
parent e485bf4ef5
commit 4c480abb75
1 changed files with 54 additions and 4 deletions
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58
sjplayer/src/sjplayer/PostEffect.d
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@ -1,11 +1,22 @@
/// License: MIT /// License: MIT
module sjplayer.PostEffect; module sjplayer.PostEffect;
import std.string;
import gl4d; import gl4d;
/// ///
class PostEffect { class PostEffect {
public: public:
///
struct Instance {
public:
///
align(1) vec2 clip_lefttop = vec2(1, 1);
///
align(1) vec2 clip_righttop = vec2(1, 1);
}
/// ///
this(PostEffectProgram program, vec2i sz) { this(PostEffectProgram program, vec2i sz) {
size_ = sz; size_ = sz;
@ -48,9 +59,11 @@ class PostEffect {
} }
/// ///
void DrawFramebuffer() { void DrawFramebuffer() {
program_.Draw(tex_, sampler_, size_); program_.Draw(tex_, sampler_, instance, size_);
} }
Instance instance;
private: private:
const vec2i size_; const vec2i size_;
@ -77,7 +90,7 @@ class PostEffectProgram {
out vec2 uv_; out vec2 uv_;
void main() { void main() {
uv_ = (vert+vec2(1, 1)) / 2; uv_ = vert;
gl_Position = vec4(vert, 0, 1); gl_Position = vec4(vert, 0, 1);
} }
}; };
@ -86,12 +99,24 @@ class PostEffectProgram {
layout(location = 0) uniform sampler2DRect fb; layout(location = 0) uniform sampler2DRect fb;
layout(location = 1) uniform ivec2 fb_size; layout(location = 1) uniform ivec2 fb_size;
layout(std140) uniform Instance {
vec2 clip_lefttop;
vec2 clip_rightbottom;
} instance;
in vec2 uv_; in vec2 uv_;
out vec4 pixel_; out vec4 pixel_;
void main() { void main() {
pixel_ = texture(fb, fb_size * uv_); vec2 tex_uv = (uv_ + vec2(1, 1)) / 2;
pixel_ = texture(fb, fb_size * tex_uv);
pixel_.a *=
step(-instance.clip_lefttop.x, uv_.x) *
(1-step(instance.clip_rightbottom.x, uv_.x)) *
(1-step(instance.clip_lefttop.y, uv_.y)) *
step(-instance.clip_rightbottom.y, uv_.x);
} }
}; };
@ -105,6 +130,9 @@ class PostEffectProgram {
vao_ = VertexArray.Create(); vao_ = VertexArray.Create();
verts_ = ArrayBuffer.Create(); verts_ = ArrayBuffer.Create();
ubo_ = UniformBuffer.Create();
ubo_index_ = gl.GetUniformBlockIndex(program_.id, "Instance".toStringz);
vao_.Bind(); vao_.Bind();
VertexArrayAttacher attacher; VertexArrayAttacher attacher;
@ -124,10 +152,22 @@ class PostEffectProgram {
usage = GL_STATIC_DRAW; usage = GL_STATIC_DRAW;
Allocate(verts_); Allocate(verts_);
} }
ubo_.Bind();
UniformBufferAllocator ub_allocator;
with (ub_allocator) {
size = PostEffect.Instance.sizeof;
usage = GL_DYNAMIC_DRAW;
Allocate(ubo_);
}
} }
/// ///
void Draw(ref TextureRectRef fb, ref SamplerRef sampler, vec2i size) { void Draw(
ref TextureRectRef fb,
ref SamplerRef sampler,
ref PostEffect.Instance instance,
vec2i size) {
program_.Use(); program_.Use();
fb.BindToUnit(GL_TEXTURE0); fb.BindToUnit(GL_TEXTURE0);
@ -135,6 +175,12 @@ class PostEffectProgram {
program_.uniform!0 = 0; program_.uniform!0 = 0;
program_.uniform!1 = size; program_.uniform!1 = size;
{
auto ptr = ubo_.MapToWrite!(PostEffect.Instance);
*ptr = instance;
}
ubo_.BindForUniformBlock(ubo_index_);
vao_.Bind(); vao_.Bind();
gl.DrawArrays(GL_TRIANGLE_FAN, 0, 4); gl.DrawArrays(GL_TRIANGLE_FAN, 0, 4);
} }
@ -145,4 +191,8 @@ class PostEffectProgram {
ArrayBufferRef verts_; ArrayBufferRef verts_;
VertexArrayRef vao_; VertexArrayRef vao_;
UniformBufferRef ubo_;
const GLuint ubo_index_;
} }