From 41836760fa59abc74098aed7450b4858dc288e56 Mon Sep 17 00:00:00 2001
From: Andrei Karas <akaras@inbox.ru>
Date: Wed, 11 Jun 2014 13:05:49 +0300
Subject: In modernopengl add alpha for textures.

---
 src/render/modernopenglgraphics.cpp | 22 ++++++++++------------
 src/render/modernopenglgraphics.h   |  1 +
 src/test/testlauncher.cpp           |  2 ++
 3 files changed, 13 insertions(+), 12 deletions(-)

(limited to 'src')

diff --git a/src/render/modernopenglgraphics.cpp b/src/render/modernopenglgraphics.cpp
index 3241821ba..a1c2d2bb6 100644
--- a/src/render/modernopenglgraphics.cpp
+++ b/src/render/modernopenglgraphics.cpp
@@ -100,6 +100,7 @@ ModernOpenGLGraphics::ModernOpenGLGraphics() :
     mSimpleColorUniform(0U),
     mSimplePosAttrib(0),
     mTexturePosAttrib(0),
+    mTextureColorUniform(0U),
     mSimpleScreenUniform(0U),
     mTextureScreenUniform(0U),
     mVao(0U),
@@ -168,6 +169,8 @@ void ModernOpenGLGraphics::postInit()
     mglVertexAttribFormat(mSimplePosAttrib, 2, GL_FLOAT, GL_FALSE, 0);
 
     mTexturePosAttrib = mglGetAttribLocation(mTextureProgramId, "position");
+    mTextureColorUniform = mglGetUniformLocation(mTextureProgramId, "color");
+    mglUniform1f(mTextureColorUniform, 1.0f);
     mTextureScreenUniform = mglGetUniformLocation(mTextureProgramId, "screen");
     mglVertexAttribFormat(mTexturePosAttrib, 4, GL_FLOAT, GL_FALSE, 0);
 
@@ -247,15 +250,11 @@ void ModernOpenGLGraphics::setColorAll(const Color &color,
 
 void ModernOpenGLGraphics::setColorAlpha(const float alpha)
 {
-    // here need set alpha uniform for textures only
-/*
-    if (!mIsByteColor && mFloatColor == alpha)
-        return;
-
-    glColor4f(1.0F, 1.0F, 1.0F, alpha);
-    mIsByteColor = false;
-    mFloatColor = alpha;
-*/
+    if (mAlphaCached != alpha)
+    {
+        mAlphaCached = alpha;
+        mglUniform1f(mTextureColorUniform, alpha);
+    }
 }
 
 void ModernOpenGLGraphics::drawQuad(const Image *const image,
@@ -317,12 +316,12 @@ bool ModernOpenGLGraphics::drawImageInline(const Image *const image,
     if (!image)
         return false;
 
-    setColorAlpha(image->mAlpha);
 #ifdef DEBUG_BIND_TEXTURE
     debugBindTexture(image);
 #endif
     bindTexture(GL_TEXTURE_2D, image->mGLImage);
     setTexturingAndBlending(true);
+    setColorAlpha(image->mAlpha);
 
     const ClipRect &clipArea = mClipStack.top();
     const SDL_Rect &imageRect = image->mBounds;
@@ -385,14 +384,13 @@ void ModernOpenGLGraphics::drawPatternInline(const Image *const image,
     const int x2 = x + clipArea.xOffset;
     const int y2 = y + clipArea.yOffset;
 
-    setColorAlpha(image->mAlpha);
-
 #ifdef DEBUG_BIND_TEXTURE
     debugBindTexture(image);
 #endif
     bindTexture(OpenGLImageHelper::mTextureType, image->mGLImage);
 
     setTexturingAndBlending(true);
+    setColorAlpha(image->mAlpha);
 
     unsigned int vp = 0;
     const unsigned int vLimit = mMaxVertices * 4;
diff --git a/src/render/modernopenglgraphics.h b/src/render/modernopenglgraphics.h
index 5519fd282..d9c043fc0 100644
--- a/src/render/modernopenglgraphics.h
+++ b/src/render/modernopenglgraphics.h
@@ -98,6 +98,7 @@ class ModernOpenGLGraphics final : public Graphics
         GLuint mSimpleColorUniform;
         GLint mSimplePosAttrib;
         GLint mTexturePosAttrib;
+        GLint mTextureColorUniform;
         GLuint mSimpleScreenUniform;
         GLuint mTextureScreenUniform;
         GLuint mVao;
diff --git a/src/test/testlauncher.cpp b/src/test/testlauncher.cpp
index da09813d8..623fae805 100644
--- a/src/test/testlauncher.cpp
+++ b/src/test/testlauncher.cpp
@@ -380,7 +380,9 @@ int TestLauncher::testDraw()
     mainGraphics->drawRectangle(Rect(0, 0, 400, 200));
 
     mainGraphics->setColor(Color(0xFFU, 0x00U, 0x00U, 0xB0U));
+    img[0]->setAlpha(0.5f);
     mainGraphics->drawImage(img[0], 190, 383);
+    img[0]->setAlpha(1.0f);
 
     mainGraphics->setColor(Color(0x80U, 0x00U, 0xA0U, 0x90U));
     mainGraphics->fillRectangle(Rect(200, 100, 300, 300));
-- 
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