Added an opacity shader.

es-core/src/components/ComponentList.cpp

@@ -227,6 +227,7 @@ void ComponentList::render(const Transform4x4f& parentTrans)
                     }
                 }
                 else {
+                    it->component->setOpacity(mOpacity);
                     it->component->render(trans);
                 }
             }
@@ -239,6 +240,8 @@ void ComponentList::render(const Transform4x4f& parentTrans)
     // Custom rendering.
     Renderer::setMatrix(trans);
 
+    float opacity = mOpacity / 255.0;
+
     // Draw selector bar.
     if (mFocused) {
         // Inversion: src * (1 - dst) + dst * 0 = where src = 1
@@ -247,18 +250,21 @@ void ComponentList::render(const Transform4x4f& parentTrans)
         // (1 - dst) + 0x77
 
         const float selectedRowHeight = getRowHeight(mEntries.at(mCursor).data);
-        Renderer::drawRect(0.0f, mSelectorBarOffset, mSize.x(), selectedRowHeight,
-                0xFFFFFFFF, 0xFFFFFFFF, false, Renderer::Blend::ONE_MINUS_DST_COLOR,
-                Renderer::Blend::ZERO);
-        Renderer::drawRect(0.0f, mSelectorBarOffset, mSize.x(), selectedRowHeight,
-                0x777777FF, 0x777777FF, false, Renderer::Blend::ONE,
-                Renderer::Blend::ONE);
 
+        if (opacity == 1) {
+            Renderer::drawRect(0.0f, mSelectorBarOffset, mSize.x(), selectedRowHeight,
+                    0xFFFFFFFF, 0xFFFFFFFF, false, opacity, trans,
+                    Renderer::Blend::ONE_MINUS_DST_COLOR, Renderer::Blend::ZERO);
+
+            Renderer::drawRect(0.0f, mSelectorBarOffset, mSize.x(), selectedRowHeight,
+                    0x777777FF, 0x777777FF, false, opacity, trans,
+                    Renderer::Blend::ONE, Renderer::Blend::ONE);
             // Hack to draw 2px dark on left/right of the bar.
             Renderer::drawRect(0.0f, mSelectorBarOffset, 2.0f, selectedRowHeight,
-                0x878787FF, 0x878787FF);
+                    0x878787FF, 0x878787FF, false, opacity, trans);
             Renderer::drawRect(mSize.x() - 2.0f, mSelectorBarOffset, 2.0f, selectedRowHeight,
-                0x878787FF, 0x878787FF);
+                    0x878787FF, 0x878787FF, false, opacity, trans);
+        }
 
         for (auto it = drawAfterCursor.cbegin(); it != drawAfterCursor.cend(); it++)
             (*it)->render(trans);
@@ -271,11 +277,11 @@ void ComponentList::render(const Transform4x4f& parentTrans)
     // Draw separators.
     float y = 0;
     for (unsigned int i = 0; i < mEntries.size(); i++) {
-        Renderer::drawRect(0.0f, y, mSize.x(), 1.0f, 0xC6C7C6FF, 0xC6C7C6FF);
+        Renderer::drawRect(0.0f, y, mSize.x(), 1.0f, 0xC6C7C6FF, 0xC6C7C6FF, false, opacity, trans);
         y += getRowHeight(mEntries.at(i).data);
     }
 
-    Renderer::drawRect(0.0f, y, mSize.x(), 1.0f, 0xC6C7C6FF, 0xC6C7C6FF);
+    Renderer::drawRect(0.0f, y, mSize.x(), 1.0f, 0xC6C7C6FF, 0xC6C7C6FF, false, opacity, trans);
     Renderer::popClipRect();
 }
 

es-core/src/components/NinePatchComponent.cpp

@@ -112,9 +112,12 @@ void NinePatchComponent::render(const Transform4x4f& parentTrans)
 
     if (mTexture && mVertices != nullptr) {
         Renderer::setMatrix(trans);
-
+        if (mOpacity < 255) {
+            mVertices[0].shaders = Renderer::SHADER_OPACITY;
+            mVertices[0].opacity = mOpacity / 255.0;
+        }
         mTexture->bind();
-        Renderer::drawTriangleStrips(&mVertices[0], 6*9);
+        Renderer::drawTriangleStrips(&mVertices[0], 6*9, trans);
     }
 
     renderChildren(trans);

es-core/src/renderers/Renderer.cpp

@@ -169,6 +169,7 @@ namespace Renderer
 
         std::vector<std::string> shaderFiles;
         shaderFiles.push_back(":/shaders/glsl/desaturate.glsl");
+        shaderFiles.push_back(":/shaders/glsl/opacity.glsl");
         shaderFiles.push_back(":/shaders/glsl/dim.glsl");
         shaderFiles.push_back(":/shaders/glsl/blur_horizontal.glsl");
         shaderFiles.push_back(":/shaders/glsl/blur_vertical.glsl");
@@ -344,6 +345,8 @@ namespace Renderer
             const unsigned int _color,
             const unsigned int _colorEnd,
             bool horizontalGradient,
+            const float _opacity,
+            const Transform4x4f& _trans,
             const Blend::Factor _srcBlendFactor,
             const Blend::Factor _dstBlendFactor)
     {
@@ -360,8 +363,14 @@ namespace Renderer
         for (int i = 0; i < 4; ++i)
             vertices[i].pos.round();
 
+        if (_opacity < 1.0) {
+            vertices[0].shaders = SHADER_OPACITY;
+            vertices[0].opacity = _opacity;
+        }
+        else {
             bindTexture(0);
-        drawTriangleStrips(vertices, 4, Transform4x4f::Identity(),
+        }
+        drawTriangleStrips(vertices, 4, _trans,
                 _srcBlendFactor, _dstBlendFactor);
     }
 

es-core/src/renderers/Renderer.h

@@ -23,16 +23,18 @@ struct SDL_Window;
 namespace Renderer
 {
     const unsigned int SHADER_DESATURATE =          1;
-    const unsigned int SHADER_DIM =                 2;
+    const unsigned int SHADER_OPACITY =             2;
-    const unsigned int SHADER_BLUR_HORIZONTAL =     4;
+    const unsigned int SHADER_DIM =                 4;
-    const unsigned int SHADER_BLUR_VERTICAL =       8;
+    const unsigned int SHADER_BLUR_HORIZONTAL =     8;
-    const unsigned int SHADER_SCANLINES =           16;
+    const unsigned int SHADER_BLUR_VERTICAL =       16;
+    const unsigned int SHADER_SCANLINES =           32;
 
     struct shaderParameters {
         std::array<GLfloat, 2> textureSize;
         std::array<GLfloat, 4> textureCoordinates;
         float fragmentSaturation;
         float fragmentDimValue;
+        float fragmentOpacity;
         unsigned int shaderPasses;
 
         shaderParameters()
@@ -40,6 +42,7 @@ namespace Renderer
                 textureCoordinates({0.0, 0.0, 0.0, 0.0}),
                 fragmentSaturation(1.0),
                 fragmentDimValue(0.4),
+                fragmentOpacity(1.0),
                 shaderPasses(1)
                 {};
     };
@@ -124,6 +127,7 @@ namespace Renderer
         Vector2f tex;
         unsigned int col;
         float saturation = 1.0;
+        float opacity = 1.0;
         unsigned int shaders = 0;
     };
 
@@ -139,6 +143,8 @@ namespace Renderer
             const unsigned int _color,
             const unsigned int _colorEnd,
             bool horizontalGradient = false,
+            const float _opacity = 1.0,
+            const Transform4x4f& _trans = Transform4x4f::Identity(),
             const Blend::Factor _srcBlendFactor = Blend::SRC_ALPHA,
             const Blend::Factor _dstBlendFactor = Blend::ONE_MINUS_SRC_ALPHA);
     SDL_Window* getSDLWindow();

es-core/src/renderers/Renderer_GL21.cpp

@@ -275,6 +275,19 @@ namespace Renderer
                     }
                 }
 
+                if (_vertices->shaders & SHADER_OPACITY) {
+                    Shader* runShader = getShaderProgram(SHADER_OPACITY);
+                    if (runShader) {
+                        runShader->activateShaders();
+                        runShader->setModelViewProjectionMatrix(getProjectionMatrix() * _trans);
+                        _vertices->opacity < 1.0 ?
+                                runShader->setOpacity(_vertices->opacity) :
+                                runShader->setOpacity(_parameters.fragmentOpacity);
+                        GL_CHECK_ERROR(glDrawArrays(GL_TRIANGLE_STRIP, 0, _numVertices));
+                        runShader->deactivateShaders();
+                    }
+                }
+
                 // Check if any other shaders are set to be used and if so, run them.
                 if (_vertices->shaders & SHADER_DIM) {
                     Shader* runShader = getShaderProgram(SHADER_DIM);

es-core/src/renderers/Shader_GL21.cpp

@@ -21,6 +21,7 @@ namespace Renderer
             shaderTextureCoord(-1),
             shaderColor(-1),
             shaderSaturation(-1),
+            shaderOpacity(-1),
             shaderDimValue(-1)
     {
     }
@@ -106,6 +107,7 @@ namespace Renderer
         shaderTextureCoord = glGetAttribLocation(mProgramID, "TexCoord");
         shaderColor = glGetAttribLocation(mProgramID, "COLOR");
         shaderSaturation = glGetUniformLocation(mProgramID, "saturation");
+        shaderOpacity = glGetUniformLocation(mProgramID, "opacity");
         shaderDimValue = glGetUniformLocation(mProgramID, "dimValue");
     }
 
@@ -142,6 +144,12 @@ namespace Renderer
             GL_CHECK_ERROR(glUniform1f(shaderSaturation, saturation));
     }
 
+    void Renderer::Shader::setOpacity(GLfloat opacity)
+    {
+        if (shaderOpacity != -1)
+            GL_CHECK_ERROR(glUniform1f(shaderOpacity, opacity));
+    }
+
     void Renderer::Shader::setDimValue(GLfloat dimValue)
     {
         if (shaderDimValue != -1)

es-core/src/renderers/Shader_GL21.h

@@ -39,6 +39,7 @@ namespace Renderer
         void setTextureCoordinates(std::array<GLfloat, 4> shaderVec4);
         void setColor(std::array<GLfloat, 4> shaderVec4);
         void setSaturation(GLfloat saturation);
+        void setOpacity(GLfloat opacity);
         void setDimValue(GLfloat dimValue);
         // Sets the shader program to use the loaded shaders.
         void activateShaders();
@@ -60,6 +61,7 @@ namespace Renderer
         GLint shaderTextureCoord;
         GLint shaderColor;
         GLint shaderSaturation;
+        GLint shaderOpacity;
         GLint shaderDimValue;
     };
 

resources/shaders/glsl/opacity.glsl

@@ -0,0 +1,36 @@
+//
+// opacity.glsl
+//
+// Changes the opacity of textures.
+// The uniform variable 'opacity' sets the opacity.
+// Setting this to the value 0 results in an invisible texture.
+//
+
+#if defined(VERTEX)
+// Vertex section of code:
+
+uniform mat4 MVPMatrix;
+varying vec2 vTexCoord;
+
+void main(void)
+{
+    vTexCoord = gl_MultiTexCoord0.xy;
+    gl_Position = MVPMatrix * gl_Vertex;
+}
+
+#elif defined(FRAGMENT)
+// Fragment section of code:
+
+uniform float opacity = 1.0;
+uniform sampler2D myTexture;
+varying vec2 vTexCoord;
+
+void main()
+{
+    vec4 color = texture2D(myTexture, vTexCoord);
+    float alpha = clamp(color.a-(1-opacity), 0.0, 1.0);
+
+    gl_FragColor = vec4(color.rgb, alpha);
+}
+
+#endif