post processing

CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.25)
 
-set(BLT_GRAPHICS_VERSION 0.13.5)
+set(BLT_GRAPHICS_VERSION 0.13.6)
 set(BLT_GRAPHICS_TEST_VERSION 0.0.1)
 
 project(BLT_WITH_GRAPHICS VERSION ${BLT_GRAPHICS_VERSION})

include/blt/gfx/renderer/batch_2d_renderer.h

@@ -174,6 +174,7 @@ namespace blt::gfx
             shader_t* square_shader = nullptr;
             shader_t* point_shader = nullptr;
             resource_manager& resources;
+            matrix_state_manager& state;
             // texture name -> draw info
             struct
             {
@@ -209,10 +210,15 @@ namespace blt::gfx
             }
         
         public:
-            explicit batch_renderer_2d(resource_manager& resources, matrix_state_manager& state): resources(resources)
+            explicit batch_renderer_2d(resource_manager& resources, matrix_state_manager& state): resources(resources), state(state)
             {
-                engine = pp_engine_t::make_multi_pp(std::make_unique<pp_outline_target>(),
-                                             std::make_unique<pp_outline_step_t>(state));
+                engine = pp_engine_t::make_multi_pp(std::make_unique<pp_outline_target_t>(),
+                                                    std::make_unique<pp_blur_step_inplace_t>(state, frame_buffer_t::attachment_t::COLOR1),
+                                                    std::make_unique<pp_expansion_step_inplace_t>(frame_buffer_t::attachment_t::COLOR1,
+                                                                                                  vec4{4, 4, 4, 1}),
+                                                    std::make_unique<pp_blur_step_inplace_t>(state, frame_buffer_t::attachment_t::COLOR1, 2, 2),
+                                                    std::make_unique<pp_outline_step_t>(state)
+                                                   );
             }
             
             void create();

include/blt/gfx/renderer/postprocess.h

@@ -26,6 +26,7 @@
 #include <blt/gfx/state.h>
 #include <vector>
 #include <memory>
+#include <blt/std/assert.h>
 
 namespace blt::gfx
 {
@@ -33,6 +34,12 @@ namespace blt::gfx
     
     class pp_step_t;
     
+    enum class pp_request_t : u64
+    {
+        BIND_BUFFER = 0x1,
+        CLEAR_BUFFER = 0x2
+    };
+    
     class pp_step_t
     {
         public:
@@ -40,13 +47,17 @@ namespace blt::gfx
             {}
             
             // only called on render()
-            virtual void draw(pp_step_t&)
+            virtual void draw(frame_buffer_t&)
             {}
             
             // only called on bind()
             virtual void draw()
             {}
             
+            // called after rendering, provides previous framebuffer
+            virtual void post_draw(frame_buffer_t&)
+            {}
+            
             auto& getBuffer()
             {
                 return draw_buffer;
@@ -62,6 +73,11 @@ namespace blt::gfx
                 return shader != nullptr;
             }
             
+            virtual bool requests(pp_request_t)
+            {
+                return true;
+            }
+            
             virtual ~pp_step_t() = default;
         
         protected:
@@ -69,6 +85,25 @@ namespace blt::gfx
             std::unique_ptr<shader_t> shader;
     };
     
+    class pp_in_place_t : public pp_step_t
+    {
+        public:
+            pp_in_place_t(frame_buffer_t::attachment_t from): from(from), to(from)
+            {}
+            
+            pp_in_place_t(frame_buffer_t::attachment_t from, frame_buffer_t::attachment_t to): from(from), to(to)
+            {}
+            
+            bool requests(blt::gfx::pp_request_t request) override
+            {
+                return static_cast<u64>(request) & ~(static_cast<u64>(pp_request_t::BIND_BUFFER) | static_cast<u64>(pp_request_t::CLEAR_BUFFER));
+            }
+        
+        protected:
+            frame_buffer_t::attachment_t from;
+            frame_buffer_t::attachment_t to;
+    };
+    
     class pp_render_target_t : public pp_step_t
     {
         public:
@@ -82,10 +117,10 @@ namespace blt::gfx
         public:
             void create() override;
             
-            void draw(pp_step_t& previous) override;
+            void draw(frame_buffer_t& previous) override;
     };
     
-    class pp_outline_target : public pp_step_t
+    class pp_outline_target_t : public pp_step_t
     {
         public:
             void create() override;
@@ -101,12 +136,93 @@ namespace blt::gfx
             
             void create() override;
             
-            void draw(pp_step_t& previous) override;
+            void draw(frame_buffer_t& previous) override;
         
         private:
             matrix_state_manager& manager;
     };
     
+    class pp_blur_step_base_t : public pp_step_t
+    {
+        public:
+            pp_blur_step_base_t(frame_buffer_t::attachment_t from, i32 x_blur = 2, i32 y_blur = 2):
+                    from(from), to(from), x_blur(x_blur), y_blur(y_blur)
+            {}
+            
+            pp_blur_step_base_t(frame_buffer_t::attachment_t from, frame_buffer_t::attachment_t to, i32 x_blur = 2, i32 y_blur = 2):
+                    from(from), to(to), x_blur(x_blur), y_blur(y_blur)
+            {}
+        
+        protected:
+            frame_buffer_t::attachment_t from;
+            frame_buffer_t::attachment_t to;
+            i32 x_blur;
+            i32 y_blur;
+    };
+    
+    class pp_blur_step_t : public pp_blur_step_base_t
+    {
+        public:
+            pp_blur_step_t(frame_buffer_t::attachment_t from, i32 x_blur = 2, i32 y_blur = 2): pp_blur_step_base_t(from, x_blur, y_blur)
+            {}
+            
+            pp_blur_step_t(frame_buffer_t::attachment_t from, frame_buffer_t::attachment_t to, i32 x_blur = 2, i32 y_blur = 2):
+                    pp_blur_step_base_t(from, to, x_blur, y_blur)
+            {}
+            
+            void create() override;
+            
+            void draw(frame_buffer_t& previous);
+    };
+    
+    class pp_blur_step_inplace_t : public pp_blur_step_base_t
+    {
+        public:
+            pp_blur_step_inplace_t(matrix_state_manager& manager, frame_buffer_t::attachment_t from, i32 x_blur = 2, i32 y_blur = 2):
+                    pp_blur_step_base_t(from, x_blur, y_blur), manager(manager)
+            {}
+            
+            pp_blur_step_inplace_t(matrix_state_manager& manager, frame_buffer_t::attachment_t from, frame_buffer_t::attachment_t to, i32 x_blur = 2,
+                                   i32 y_blur = 2):
+                    pp_blur_step_base_t(from, to, x_blur, y_blur), manager(manager)
+            {}
+            
+            void create() override;
+            
+            void draw(frame_buffer_t& previous);
+            
+            void post_draw(frame_buffer_t& previous) override;
+            
+            bool requests(blt::gfx::pp_request_t request) override
+            {
+                return static_cast<u64>(request) & ~(static_cast<u64>(pp_request_t::BIND_BUFFER) | static_cast<u64>(pp_request_t::CLEAR_BUFFER));
+            }
+        
+        private:
+            std::unique_ptr<shader_t> shader_pass;
+            matrix_state_manager& manager;
+    };
+    
+    class pp_expansion_step_inplace_t : public pp_in_place_t
+    {
+        public:
+            pp_expansion_step_inplace_t(frame_buffer_t::attachment_t from, const vec4& multiplier = vec4{2,2,2,2}):
+                    pp_in_place_t(from), multiplier(multiplier)
+            {}
+            
+            pp_expansion_step_inplace_t(frame_buffer_t::attachment_t from, frame_buffer_t::attachment_t to,
+                                        const vec4& multiplier = vec4{2,2,2,2}):
+                    pp_in_place_t(from, to), multiplier(multiplier)
+            {}
+            
+            void create() override;
+            
+            void draw(frame_buffer_t& previous);
+        
+        private:
+            vec4 multiplier;
+    };
+    
     class pp_engine_t
     {
         public:
@@ -144,10 +260,14 @@ namespace blt::gfx
                 (engine->addStep(std::move(steps)), ...);
                 return std::unique_ptr<pp_engine_t>(engine);
             }
+            
+            static void render_quad();
         
         private:
             pp_engine_t() = default;
             
+            pp_step_t& find_last_frame_buffer(size_t index);
+            
             std::vector<std::unique_ptr<pp_step_t>> steps;
             std::unique_ptr<vertex_array_t> screen_vao;
     };

include/blt/gfx/renderer/shaders/pp_gaussian_blur.frag

@@ -0,0 +1,28 @@
+#ifdef __cplusplus
+#include <string>
+const std::string shader_gaussian_blur_frag = R"("
+#version 300 es
+precision mediump float;
+
+out vec4 FragColor;
+in vec2 uv;
+in vec2 pos;
+
+uniform sampler2D tex;
+uniform ivec4 size;
+
+void main() {
+    vec2 texelSize = 1.0 / vec2(float(size.x), float(size.y));
+    vec4 result = vec4(0.0, 0.0, 0.0, 0.0);
+    for (int x = -size.z; x <= size.z; ++x) {
+        for (int y = -size.w; y <= size.w; ++y) {
+            vec2 offset = (vec2(float(x), float(y)) * texelSize);
+            result += texture(tex, uv + offset);
+        }
+    }
+    //FragColor = result;
+    FragColor = result / vec4((float(size.z) * 2.0 + 1.0) * (float(size.w) * 2.0 + 1.0));
+}
+
+")";
+#endif

include/blt/gfx/renderer/shaders/pp_multiplier.frag

@@ -0,0 +1,19 @@
+#ifdef __cplusplus
+#include <string>
+const std::string shader_multiplier_frag = R"("
+#version 300 es
+precision mediump float;
+
+out vec4 FragColor;
+in vec2 uv;
+in vec2 pos;
+
+uniform sampler2D tex;
+uniform vec4 multiplier;
+
+void main() {
+    FragColor = normalize(texture(tex, uv) * multiplier);
+}
+
+")";
+#endif

include/blt/gfx/renderer/shaders/pp_outline_step.frag

@@ -19,38 +19,41 @@ float longest(vec3 v){
     return max(v.r, max(v.b, v.g));
 }
 
-#define LINE_WEIGHT 3.0
+#define LINE_WEIGHT 1.0
 
 void main() {
-    float dx = (1.0 / viewportSize.x) * LINE_WEIGHT;
-    float dy = (1.0 / viewportSize.y) * LINE_WEIGHT;
-
-    vec2 uvCenter   = uv;
-    vec2 uvRight    = vec2(uvCenter.x + dx, uvCenter.y);
-    vec2 uvTop      = vec2(uvCenter.x,      uvCenter.y - dx);
-    vec2 uvTopRight = vec2(uvCenter.x + dx, uvCenter.y - dx);
-
-    float mCenter   = longest(texture(mask, uvCenter).rgb);
-    float mTop      = longest(texture(mask, uvTop).rgb);
-    float mRight    = longest(texture(mask, uvRight).rgb);
-    float mTopRight = longest(texture(mask, uvTopRight).rgb);
-
-    float dT  = abs(mCenter - mTop);
-    float dR  = abs(mCenter - mRight);
-    float dTR = abs(mCenter - mTopRight);
-
-    float delta = 0.0f;
-    delta = max(delta, dT);
-    delta = max(delta, dR);
-    delta = max(delta, dTR);
-
-    vec4 outline = vec4(delta, delta, delta, 1.0);
-    vec4 albedo  = texture(albedo, uv);
-
-    if (delta <= 0.001)
-        FragColor = albedo;
-    else
-        FragColor = outline_color;
+//    float dx = (1.0 / viewportSize.x) * LINE_WEIGHT;
+//    float dy = (1.0 / viewportSize.y) * LINE_WEIGHT;
+//
+//    vec2 uvCenter   = uv;
+//    vec2 uvRight    = vec2(uvCenter.x + dx, uvCenter.y);
+//    vec2 uvTop      = vec2(uvCenter.x,      uvCenter.y - dy);
+//    vec2 uvTopRight = vec2(uvCenter.x + dx, uvCenter.y - dy);
+//
+//    float mCenter   = longest(texture(mask, uvCenter).rgb);
+//    float mTop      = longest(texture(mask, uvTop).rgb);
+//    float mRight    = longest(texture(mask, uvRight).rgb);
+//    float mTopRight = longest(texture(mask, uvTopRight).rgb);
+//
+//    float dT  = abs(mCenter - mTop);
+//    float dR  = abs(mCenter - mRight);
+//    float dTR = abs(mCenter - mTopRight);
+//
+//    float delta = 0.0f;
+//    delta = max(delta, dT);
+//    delta = max(delta, dR);
+//    delta = max(delta, dTR);
+//
+//    vec4 outline = vec4(delta, delta, delta, 1.0);
+//    vec4 albedo  = texture(albedo, uv);
+//
+//    if (delta <= 0.0)
+//        FragColor = albedo;
+//    else
+//        FragColor = outline_color;
+    FragColor = texture(albedo, uv);
+    if (FragColor.a == 0.0)
+        FragColor = texture(mask, uv);
 }
 
 ")";

include/blt/gfx/shader.h

@@ -116,6 +116,7 @@ namespace blt::gfx
             shader_base_t& setVec3(const std::string& name, const blt::vec3& vec);
 
             shader_base_t& setVec4(const std::string& name, const blt::vec4& vec);
+            shader_base_t& setVec4i(const std::string& name, const blt::vec4i& vec);
 
             shader_base_t& setVec2(const std::string& name, float x, float y);
 

include/blt/gfx/texture.h

@@ -135,7 +135,7 @@ namespace blt::gfx
             }
         
         protected:
-            void setDefaults(GLint type) const;
+            void setDefaults(GLint type, GLint wrap = GL_REPEAT) const;
             
             inline void generateMipmaps() const
             {

libraries/BLT

@@ -1 +1 @@
-Subproject commit 9b86278a2982d80fbac6f87045a182088e07afbe
+Subproject commit 943fb842117cd698f75ffd7d13815622e4a6e128

src/blt/gfx/framebuffer.cpp

@@ -175,10 +175,9 @@ namespace blt::gfx
     {
         glBindFramebuffer(GL_READ_FRAMEBUFFER, fboID);
         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, draw.fboID);
-        glReadBuffer(static_cast<GLuint>(attachment_read));
-#ifdef glDrawBuffer
-        glDrawBuffer(static_cast<GLuint>(attachment_write));
-#endif
+        glReadBuffer(static_cast<GLenum>(attachment_read));
+        GLenum buffers[] {static_cast<GLenum>(attachment_write)};
+        glDrawBuffers(1, buffers);
         glBlitFramebuffer(srcX, srcY, width_, height_, destX, destY, draw.width_, draw.height_, GL_COLOR_BUFFER_BIT, filter);
     }
     
@@ -186,6 +185,9 @@ namespace blt::gfx
     {
         glBindFramebuffer(GL_READ_FRAMEBUFFER, fboID);
         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, draw.fboID);
+        glReadBuffer(static_cast<GLenum>(attachment_t::DEPTH));
+        GLenum buffers[] {static_cast<GLenum>(attachment_t::DEPTH)};
+        glDrawBuffers(1, buffers);
         glBlitFramebuffer(srcX, srcY, width_, height_, destX, destY, draw.width_, draw.height_, GL_DEPTH_BUFFER_BIT, filter);
     }
     
@@ -193,6 +195,9 @@ namespace blt::gfx
     {
         glBindFramebuffer(GL_READ_FRAMEBUFFER, fboID);
         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, draw.fboID);
+        glReadBuffer(static_cast<GLenum>(attachment_t::STENCIL));
+        GLenum buffers[] {static_cast<GLenum>(attachment_t::STENCIL)};
+        glDrawBuffers(1, buffers);
         glBlitFramebuffer(srcX, srcY, width_, height_, destX, destY, draw.width_, draw.height_, GL_STENCIL_BUFFER_BIT, filter);
     }
     
@@ -202,6 +207,9 @@ namespace blt::gfx
         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
         //glReadBuffer(GL_COLOR_ATTACHMENT0);
         //glDrawBuffer(GL_COLOR_ATTACHMENT0);
+        glReadBuffer(static_cast<GLenum>(attachment_t::COLOR0));
+        GLenum buffers[] {static_cast<GLenum>(attachment_t::COLOR0)};
+        glDrawBuffers(1, buffers);
         glBlitFramebuffer(0, 0, width_, height_, 0, 0, width, height, GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
     }
     

src/blt/gfx/renderer/batch_2d_renderer.cpp

@@ -184,8 +184,6 @@ namespace blt::gfx
         glActiveTexture(GL_TEXTURE0);
         
         engine->bind();
-        const GLenum buffers[]{GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1};
-        glDrawBuffers(2, buffers);
         draw_objects();
         
         glDisable(GL_DEPTH_TEST);
@@ -295,7 +293,7 @@ namespace blt::gfx
                 
                 mat4x4 model;
                 model.translate(point.pos.x(), point.pos.y(), 0.0f);
-                model.scale(point.scale, point.scale, 1);
+                model.scale(point.scale, point.scale, 1.0);
                 
                 point_shader->setVec4("color", render_info.color);
                 point_shader->setVec4("use_texture", render_info.blend);

src/blt/gfx/renderer/postprocess.cpp

@@ -20,7 +20,10 @@
 #include <blt/gfx/renderer/shaders/postprocess.vert>
 #include <blt/gfx/renderer/shaders/pp_screen.frag>
 #include <blt/gfx/renderer/shaders/pp_outline_step.frag>
+#include <blt/gfx/renderer/shaders/pp_gaussian_blur.frag>
+#include <blt/gfx/renderer/shaders/pp_multiplier.frag>
 #include <blt/std/ranges.h>
+#include <blt/math/log_util.h>
 
 #define __EMSCRIPTEN__
 
@@ -68,6 +71,17 @@ namespace blt::gfx
             step->create();
     }
     
+    pp_step_t& pp_engine_t::find_last_frame_buffer(size_t index)
+    {
+        for (i64 i = static_cast<i64>(index); i >= 0; i--)
+        {
+            if (steps[i]->requests(pp_request_t::BIND_BUFFER))
+                return *steps[i];
+        }
+        BLT_FATAL("We reached the end trying to find a previous frame buffer, unable to do so! Please ensure this in-place step has a framebuffer!");
+        std::exit(1);
+    }
+    
     void pp_engine_t::render()
     {
         screen_vao->bind();
@@ -75,13 +89,18 @@ namespace blt::gfx
         {
             if (index == 0)
                 continue;
-            auto& previous = steps[index - 1];
-            step->getBuffer().bind(frame_buffer_t::draw_t::BOTH);
-            step->draw(*previous);
+            auto& previous = find_last_frame_buffer(index - 1);
+            if (step->requests(pp_request_t::BIND_BUFFER))
+                step->getBuffer().bind();
+            else
+                previous.getBuffer().bind();
+            if (step->requests(pp_request_t::CLEAR_BUFFER))
+                glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+            step->draw(previous.getBuffer());
             if (step->hasShader())
                 step->getShader().bind();
-            glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
-            glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+            render_quad();
+            step->post_draw(previous.getBuffer());
         }
         glBindTexture(GL_TEXTURE_2D, 0);
         frame_buffer_t::unbind();
@@ -108,20 +127,27 @@ namespace blt::gfx
     
     void pp_engine_t::bind()
     {
-        steps.front()->draw();
         steps.front()->getBuffer().bind();
+        steps.front()->draw();
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
     }
     
+    void pp_engine_t::render_quad()
+    {
+        glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+    }
+    
     void pp_to_screen_step_t::create()
     {
         shader = pp_engine_t::createShader(shader_pp_screen_frag);
     }
     
-    void pp_to_screen_step_t::draw(pp_step_t& previous)
+    void pp_to_screen_step_t::draw(frame_buffer_t& previous)
     {
         glActiveTexture(GL_TEXTURE0);
-        previous.getBuffer().getTexture(frame_buffer_t::attachment_t::COLOR0).bind();
+        previous.getTexture(frame_buffer_t::attachment_t::COLOR0).bind();
+        GLenum buf[]{static_cast<GLenum>(frame_buffer_t::attachment_t::COLOR0)};
+        glDrawBuffers(1, buf);
     }
     
     void pp_render_target_t::create()
@@ -132,9 +158,11 @@ namespace blt::gfx
     void pp_render_target_t::draw()
     {
         draw_buffer.updateBuffersStorage(getWindowWidth(), getWindowHeight());
+        GLenum buf[]{static_cast<GLenum>(frame_buffer_t::attachment_t::COLOR0)};
+        glDrawBuffers(1, buf);
     }
     
-    void pp_outline_target::create()
+    void pp_outline_target_t::create()
     {
         draw_buffer.create();
         draw_buffer.bind();
@@ -153,9 +181,11 @@ namespace blt::gfx
         frame_buffer_t::unbind();
     }
     
-    void pp_outline_target::draw()
+    void pp_outline_target_t::draw()
     {
         draw_buffer.updateBuffersStorage(getWindowWidth(), getWindowHeight());
+        const GLenum buffers[]{static_cast<GLenum>(frame_buffer_t::attachment_t::COLOR0), static_cast<GLenum>(frame_buffer_t::attachment_t::COLOR1)};
+        glDrawBuffers(2, buffers);
     }
     
     void pp_outline_step_t::create()
@@ -166,15 +196,86 @@ namespace blt::gfx
         shader->setInt("mask", 1);
     }
     
-    void pp_outline_step_t::draw(pp_step_t& previous)
+    void pp_outline_step_t::draw(frame_buffer_t& previous)
     {
         draw_buffer.updateBuffersStorage(getWindowWidth(), getWindowHeight());
         glActiveTexture(GL_TEXTURE0);
-        previous.getBuffer().getTexture(frame_buffer_t::attachment_t::COLOR0).bind();
+        previous.getTexture(frame_buffer_t::attachment_t::COLOR0).bind();
         glActiveTexture(GL_TEXTURE1);
-        previous.getBuffer().getTexture(frame_buffer_t::attachment_t::COLOR1).bind();
+        previous.getTexture(frame_buffer_t::attachment_t::COLOR1).bind();
         shader->bind();
-        auto v = manager.getScale2D();
-        shader->setVec2("viewportSize", static_cast<f32>(getWindowWidth()) * (1.0f/v.x()), static_cast<f32>(getWindowHeight()) * (1.0f / v.y()));
+        auto v = vec2(getWindowWidth(), getWindowHeight()) * (1.0 / blt::make_vec2(manager.getScale2D()));
+        //BLT_TRACE_STREAM << v << '\n';
+        //shader->setVec2("viewportSize", static_cast<f32>(v.x()), static_cast<f32>(v.y()));
+        GLenum buf[]{static_cast<GLenum>(frame_buffer_t::attachment_t::COLOR0)};
+        glDrawBuffers(1, buf);
+    }
+    
+    void pp_blur_step_t::create()
+    {
+        draw_buffer = frame_buffer_t::make_render_texture(getWindowWidth(), getWindowHeight());
+        shader = pp_engine_t::createShader(shader_gaussian_blur_frag);
+    }
+    
+    void pp_blur_step_t::draw(frame_buffer_t& previous)
+    {
+        draw_buffer.updateBuffersStorage(getWindowWidth(), getWindowHeight());
+        shader->bind();
+        shader->setVec4i("size", {getWindowWidth(), getWindowHeight(), x_blur, y_blur});
+        glActiveTexture(GL_TEXTURE0);
+        previous.getTexture(from).bind();
+        GLenum buf[]{static_cast<GLenum>(to)};
+        glDrawBuffers(1, buf);
+    }
+    
+    void pp_blur_step_inplace_t::create()
+    {
+        draw_buffer = frame_buffer_t::make_render_texture(getWindowWidth(), getWindowHeight());
+        shader = pp_engine_t::createShader(shader_gaussian_blur_frag);
+        shader_pass = pp_engine_t::createShader(shader_pp_screen_frag);
+    }
+    
+    void pp_blur_step_inplace_t::draw(frame_buffer_t& previous)
+    {
+        draw_buffer.updateBuffersStorage(getWindowWidth(), getWindowHeight());
+        shader->bind();
+        //auto v = vec2(getWindowWidth(), getWindowHeight()) * (1.0 / blt::make_vec2(manager.getScale2D()));
+        auto v = vec2(getWindowWidth(), getWindowHeight());
+        shader->setVec4i("size", {static_cast<i32>(v.x()), static_cast<i32>(v.y()), x_blur, y_blur});
+        glActiveTexture(GL_TEXTURE0);
+        previous.getTexture(from).bind();
+        //GLenum buf[]{static_cast<GLenum>(to)};
+        GLenum buf[]{static_cast<GLenum>(frame_buffer_t::attachment_t::COLOR0)};
+        glDrawBuffers(1, buf);
+        draw_buffer.bind();
+        glClear(GL_COLOR_BUFFER_BIT);
+    }
+    
+    void pp_blur_step_inplace_t::post_draw(frame_buffer_t& previous)
+    {
+        //draw_buffer.blitTexture(previous, 0, 0, 0, 0, GL_NEAREST, from, to);
+        previous.bind();
+        GLenum buf[]{static_cast<GLenum>(to)};
+        glDrawBuffers(1, buf);
+        glClear(GL_COLOR_BUFFER_BIT);
+        shader_pass->bind();
+        glActiveTexture(GL_TEXTURE0);
+        draw_buffer.getTexture(frame_buffer_t::attachment_t::COLOR0).bind();
+        pp_engine_t::render_quad();
+    }
+    
+    void pp_expansion_step_inplace_t::create()
+    {
+        shader = pp_engine_t::createShader(shader_multiplier_frag);
+    }
+    
+    void pp_expansion_step_inplace_t::draw(frame_buffer_t& previous)
+    {
+        shader->bind();
+        shader->setVec4("multiplier", multiplier);
+        glActiveTexture(GL_TEXTURE0);
+        previous.getTexture(from).bind();
+        GLenum buf[]{static_cast<u32>(to)};
+        glDrawBuffers(1, buf);
     }
 }

src/blt/gfx/shader.cpp

@@ -322,6 +322,15 @@ namespace blt::gfx
         return *this;
     }
     
+    shader_base_t& shader_base_t::setVec4i(const std::string& name, const vec4i& vec)
+    {
+        if (auto i = getUniformLocation(name))
+            glUniform4i(i.i, vec.x(), vec.y(), vec.z(), vec.w());
+        else
+            BLT_WARN("Unable to find vec4i uniform variable %s", name.c_str());
+        return *this;
+    }
+    
     shader_base_t::IntDefaultedToMinusOne shader_base_t::getUniformLocation(const std::string& name)
     {
         if (uniformVars[name])

src/blt/gfx/texture.cpp

@@ -152,10 +152,10 @@ blt::gfx::texture_file& blt::gfx::texture_file::resize(int target_width, int tar
     return *this;
 }
 
-void blt::gfx::texture_gl::setDefaults(GLint type) const
+void blt::gfx::texture_gl::setDefaults(GLint type, GLint wrap_type) const
 {
-    glTexParameteri(textureBindType, GL_TEXTURE_WRAP_S, GL_REPEAT);
-    glTexParameteri(textureBindType, GL_TEXTURE_WRAP_T, GL_REPEAT);
+    glTexParameteri(textureBindType, GL_TEXTURE_WRAP_S, wrap_type);
+    glTexParameteri(textureBindType, GL_TEXTURE_WRAP_T, wrap_type);
     // nearest preserves the pixely look
 #ifdef __EMSCRIPTEN__
     glTexParameteri(textureBindType, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
@@ -215,7 +215,7 @@ void blt::gfx::texture_gl2D::resize(int width, int height)
 blt::gfx::texture_gl2D::texture_gl2D(int width, int height, GLint colorMode): texture_gl(width, height, GL_TEXTURE_2D, colorMode)
 {
     bind();
-    setDefaults(GL_LINEAR);
+    setDefaults(GL_LINEAR, GL_CLAMP_TO_EDGE);
     resize(width, height);
     //glTexStorage2D(textureBindType, 4, colorMode, width, height);
 }
@@ -249,13 +249,17 @@ blt::gfx::texture_gl2D_multisample::texture_gl2D_multisample(int width, int heig
         texture_gl(width, height, GL_TEXTURE_2D_MULTISAMPLE, colorMode), samples(samples)
 {
     bind();
-    setDefaults(GL_LINEAR);
+    setDefaults(GL_LINEAR, GL_CLAMP_TO_EDGE);
     //glTexImage2DMultisample(textureBindType, samples, colorMode, width, height, GL_TRUE);
     glTexStorage2DMultisample(textureBindType, samples, colorMode, width, height, GL_TRUE);
 }
 
 void blt::gfx::texture_gl2D_multisample::resize(int width, int height)
 {
+    if (m_width == width && m_height == height)
+        return;
+    m_width = width;
+    m_height = height;
     bind();
     //glTexImage2DMultisample(textureBindType, samples, textureColorMode, width, height, GL_TRUE);
     glTexStorage2DMultisample(textureBindType, samples, textureColorMode, width, height, GL_TRUE);