Added screen shaders

example/screenShader.frag

@@ -0,0 +1,16 @@
+//
+// Example blue light filter shader.
+// 
+
+precision mediump float;
+varying vec2 v_texcoord;
+uniform sampler2D tex;
+
+void main() {
+
+    vec4 pixColor = texture2D(tex, v_texcoord);
+
+    pixColor[2] *= 0.8;
+
+    gl_FragColor = pixColor;
+}

src/config/ConfigManager.cpp

@@ -92,6 +92,7 @@ void CConfigManager::setDefaultVars() {
     configValues["decoration:col.shadow_inactive"].intValue = INT_MAX;
     configValues["decoration:dim_inactive"].intValue = 0;
     configValues["decoration:dim_strength"].floatValue = 0.5f;
+    configValues["decoration:screen_shader"].strValue = STRVAL_EMPTY;
 
     configValues["dwindle:pseudotile"].intValue = 0;
     configValues["dwindle:col.group_border"].intValue = 0x66777700;
@@ -403,6 +404,21 @@ void CConfigManager::configSetValueSafe(const std::string& COMMAND, const std::s
             }
         }
     }
+
+    if (COMMAND == "decoration:screen_shader") {
+        const auto PATH = absolutePath(VALUE, configCurrentPath);
+
+        configPaths.push_back(PATH);
+
+        struct stat fileStat;
+        int err = stat(PATH.c_str(), &fileStat);
+        if (err != 0) {
+            Debug::log(WARN, "Error at ticking config at %s, error %i: %s", PATH.c_str(), err, strerror(err));
+            return;
+        }
+
+        configModifyTimes[PATH] = fileStat.st_mtime;
+    }
 }
 
 void CConfigManager::handleRawExec(const std::string& command, const std::string& args) {
@@ -1230,6 +1246,9 @@ void CConfigManager::loadConfigLoadVars() {
     // Calculate the internal vars
     configValues["general:main_mod_internal"].intValue = g_pKeybindManager->stringToModMask(configValues["general:main_mod"].strValue);
 
+    if (!isFirstLaunch)
+        g_pHyprOpenGL->m_bReloadScreenShader = true;
+
     // parseError will be displayed next frame
     if (parseError != "")
         g_pHyprError->queueCreate(parseError + "\nHyprland may not work correctly.", CColor(255, 50, 50, 255));
@@ -1652,6 +1671,8 @@ SAnimationPropertyConfig* CConfigManager::getAnimationPropertyConfig(const std::
 void CConfigManager::addParseError(const std::string& err) {
     if (parseError == "")
         parseError = err;
+
+    g_pHyprError->queueCreate(parseError + "\nHyprland may not work correctly.", CColor(255, 50, 50, 255));
 }
 
 CMonitor* CConfigManager::getBoundMonitorForWS(std::string wsname) {

src/render/OpenGL.cpp

@@ -30,12 +30,22 @@ CHyprOpenGLImpl::CHyprOpenGLImpl() {
     RASSERT(eglMakeCurrent(wlr_egl_get_display(g_pCompositor->m_sWLREGL), EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT), "Couldn't unset current EGL!");
 }
 
-GLuint CHyprOpenGLImpl::createProgram(const std::string& vert, const std::string& frag) {
+GLuint CHyprOpenGLImpl::createProgram(const std::string& vert, const std::string& frag, bool dynamic) {
     auto vertCompiled = compileShader(GL_VERTEX_SHADER, vert);
+    if (dynamic) {
+        if (vertCompiled == 0)
+            return 0;
+    } else {
         RASSERT(vertCompiled, "Compiling shader failed. VERTEX NULL! Shader source:\n\n%s", vert.c_str());
+    }
 
     auto fragCompiled = compileShader(GL_FRAGMENT_SHADER, frag);
+    if (dynamic) {
+        if (fragCompiled == 0)
+            return 0;
+    } else {
         RASSERT(fragCompiled, "Compiling shader failed. FRAGMENT NULL! Shader source:\n\n%s", frag.c_str());
+    }
 
     auto prog = glCreateProgram();
     glAttachShader(prog, vertCompiled);
@@ -49,12 +59,17 @@ GLuint CHyprOpenGLImpl::createProgram(const std::string& vert, const std::string
 
     GLint ok;
     glGetProgramiv(prog, GL_LINK_STATUS, &ok);
+    if (dynamic) {
+        if (ok == GL_FALSE)
+            return 0;
+    } else {
         RASSERT(ok != GL_FALSE, "createProgram() failed! GL_LINK_STATUS not OK!");
+    }
 
     return prog;
 }
 
-GLuint CHyprOpenGLImpl::compileShader(const GLuint& type, std::string src) {
+GLuint CHyprOpenGLImpl::compileShader(const GLuint& type, std::string src, bool dynamic) {
     auto shader = glCreateShader(type);
 
     auto shaderSource = src.c_str();
@@ -64,7 +79,12 @@ GLuint CHyprOpenGLImpl::compileShader(const GLuint& type, std::string src) {
 
     GLint ok;
     glGetShaderiv(shader, GL_COMPILE_STATUS, &ok);
+    if (dynamic) {
+        if (ok == GL_FALSE)
+            return 0;
+    } else {
         RASSERT(ok != GL_FALSE, "compileShader() failed! GL_COMPILE_STATUS not OK!");
+    }
 
     return shader;
 }
@@ -112,6 +132,11 @@ void CHyprOpenGLImpl::begin(CMonitor* pMonitor, pixman_region32_t* pDamage, bool
     m_RenderData.pDamage = pDamage;
 
     m_bFakeFrame = fake;
+
+    if (m_bReloadScreenShader) {
+        m_bReloadScreenShader = false;
+        applyScreenShader(g_pConfigManager->getString("decoration:screen_shader"));
+    }
 }
 
 void CHyprOpenGLImpl::end() {
@@ -128,9 +153,11 @@ void CHyprOpenGLImpl::end() {
         clear(CColor(11, 11, 11, 255));
 
         m_bEndFrame = true;
+        m_bApplyFinalShader = true;
 
         renderTexture(m_RenderData.pCurrentMonData->primaryFB.m_cTex, &monbox, 255.f, 0);
 
+        m_bApplyFinalShader = false;
         m_bEndFrame = false;
     }
 
@@ -250,6 +277,35 @@ void CHyprOpenGLImpl::initShaders() {
     Debug::log(LOG, "Shaders initialized successfully.");
 }
 
+void CHyprOpenGLImpl::applyScreenShader(const std::string& path) {
+
+    m_sFinalScreenShader.destroy();
+
+    if (path == "" || path == STRVAL_EMPTY)
+        return;
+
+    std::ifstream infile(absolutePath(path, std::string(getenv("HOME")) + "/.config/hypr"));
+
+    if (!infile.good()) {
+        g_pConfigManager->addParseError("Screen shader parser: Screen shader path not found");
+        return;
+    }
+
+    std::string fragmentShader((std::istreambuf_iterator<char>(infile)), (std::istreambuf_iterator<char>()));
+
+    m_sFinalScreenShader.program = createProgram(TEXVERTSRC, fragmentShader, true);
+    
+    if (!m_sFinalScreenShader.program) {
+        g_pConfigManager->addParseError("Screen shader parser: Screen shader parse failed");
+        return;
+    }
+
+    m_sFinalScreenShader.proj = glGetUniformLocation(m_sFinalScreenShader.program, "proj");
+    m_sFinalScreenShader.tex = glGetUniformLocation(m_sFinalScreenShader.program, "tex");
+    m_sFinalScreenShader.texAttrib = glGetAttribLocation(m_sFinalScreenShader.program, "texcoord");
+    m_sFinalScreenShader.posAttrib = glGetAttribLocation(m_sFinalScreenShader.program, "pos");
+}
+
 void CHyprOpenGLImpl::clear(const CColor& color) {
     RASSERT(m_RenderData.pMonitor, "Tried to render without begin()!");
 
@@ -420,6 +476,12 @@ void CHyprOpenGLImpl::renderTextureInternalWithDamage(const CTexture& tex, wlr_b
     glEnable(GL_BLEND);
     glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
 
+    bool usingFinalShader = false;
+
+    if (m_bApplyFinalShader && m_sFinalScreenShader.program) {
+        shader = &m_sFinalScreenShader;
+        usingFinalShader = true;
+    } else {
         switch (tex.m_iType) {
             case TEXTURE_RGBA:
                 shader = &m_RenderData.pCurrentMonData->m_shRGBA;
@@ -433,6 +495,7 @@ void CHyprOpenGLImpl::renderTextureInternalWithDamage(const CTexture& tex, wlr_b
             default:
                 RASSERT(false, "tex.m_iTarget unsupported!");
         }
+    }
 
     glActiveTexture(GL_TEXTURE0);
     glBindTexture(tex.m_iTarget, tex.m_iTexID);
@@ -448,8 +511,10 @@ void CHyprOpenGLImpl::renderTextureInternalWithDamage(const CTexture& tex, wlr_b
     glUniformMatrix3fv(shader->proj, 1, GL_FALSE, glMatrix);
 #endif
     glUniform1i(shader->tex, 0);
+    if (!usingFinalShader) {
         glUniform1f(shader->alpha, alpha / 255.f);
         glUniform1i(shader->discardOpaque, (int)discardOpaque);
+    }
 
     wlr_box transformedBox;
     wlr_box_transform(&transformedBox, pBox, wlr_output_transform_invert(m_RenderData.pMonitor->transform),
@@ -459,6 +524,7 @@ void CHyprOpenGLImpl::renderTextureInternalWithDamage(const CTexture& tex, wlr_b
     const auto FULLSIZE = Vector2D(transformedBox.width, transformedBox.height);
     static auto *const PMULTISAMPLEEDGES = &g_pConfigManager->getConfigValuePtr("decoration:multisample_edges")->intValue;
 
+    if (!usingFinalShader) {
         // Rounded corners
         glUniform2f(shader->topLeft, TOPLEFT.x, TOPLEFT.y);
         glUniform2f(shader->fullSize, FULLSIZE.x, FULLSIZE.y);
@@ -472,6 +538,7 @@ void CHyprOpenGLImpl::renderTextureInternalWithDamage(const CTexture& tex, wlr_b
         } else {
             glUniform1i(shader->applyTint, 0);
         }
+    }
 
     const float verts[] = {
         m_RenderData.primarySurfaceUVBottomRight.x, m_RenderData.primarySurfaceUVTopLeft.y,      // top right

src/render/OpenGL.hpp

@@ -111,11 +111,15 @@ public:
     void    onWindowResizeStart(CWindow*);
     void    onWindowResizeEnd(CWindow*);
 
+    void    applyScreenShader(const std::string& path);
+
     SCurrentRenderData m_RenderData;
 
     GLint  m_iCurrentOutputFb = 0;
     GLint  m_iWLROutputFb = 0;
 
+    bool   m_bReloadScreenShader = true; // at launch it can be set
+
     CWindow* m_pCurrentWindow = nullptr; // hack to get the current rendered window
 
     pixman_region32_t m_rOriginalDamageRegion; // used for storing the pre-expanded region
@@ -134,9 +138,12 @@ private:
 
     bool                    m_bFakeFrame = false;
     bool                    m_bEndFrame = false;
+    bool                    m_bApplyFinalShader = false;
 
-    GLuint                  createProgram(const std::string&, const std::string&);
+    CShader                 m_sFinalScreenShader;
-    GLuint                  compileShader(const GLuint&, std::string);
+
+    GLuint                  createProgram(const std::string&, const std::string&, bool dynamic = false);
+    GLuint                  compileShader(const GLuint&, std::string, bool dynamic = false);
     void                    createBGTextureForMonitor(CMonitor*);
     void                    initShaders();
 

src/render/Shader.cpp

@@ -14,5 +14,11 @@ GLint CShader::getUniformLocation(const std::string& unif) {
 
 CShader::~CShader() {
     // destroy shader
+    destroy();
+
+    program = 0;
+}
+
+void CShader::destroy() {
     glDeleteProgram(program);
 }

src/render/Shader.hpp

@@ -39,6 +39,8 @@ public:
 
     GLint getUniformLocation(const std::string&);
 
+    void destroy();
+
 private:
     std::unordered_map<std::string, GLint> m_muUniforms;
 };