From 9446401bb4e50045970339cccd400dcdc879745d Mon Sep 17 00:00:00 2001
From: gazer <makhotkin_viktor@bk.ru>
Date: Fri, 29 Jan 2016 06:07:19 +0300
Subject: [PATCH] fix nvidia problem

---
 src/dlangui/graphics/gldrawbuf.d |  2 +-
 src/dlangui/graphics/glsupport.d | 32 +++++++++++++++-----------------
 2 files changed, 16 insertions(+), 18 deletions(-)

diff --git a/src/dlangui/graphics/gldrawbuf.d b/src/dlangui/graphics/gldrawbuf.d
index 36bd70d5..c8b02136 100644
--- a/src/dlangui/graphics/gldrawbuf.d
+++ b/src/dlangui/graphics/gldrawbuf.d
@@ -71,7 +71,6 @@ class GLDrawBuf : DrawBuf, GLConfigCallback {
             _scene.reset();
         }
         _scene = new Scene(this);
-        glSupport.prepareShaders();
     }
 
     /// reserved for hardware-accelerated drawing - ends drawing batch
@@ -79,6 +78,7 @@ class GLDrawBuf : DrawBuf, GLConfigCallback {
         glSupport.setOrthoProjection(Rect(0, 0, _dx, _dy), Rect(0, 0, _dx, _dy));
         _scene.draw();
         GLProgram.unbind();
+        glSupport.destroyBuffers();
         glSupport.flushGL();
         destroy(_scene);
         _scene = null;
diff --git a/src/dlangui/graphics/glsupport.d b/src/dlangui/graphics/glsupport.d
index 496ccc1d..338d5ee9 100644
--- a/src/dlangui/graphics/glsupport.d
+++ b/src/dlangui/graphics/glsupport.d
@@ -292,13 +292,8 @@ class SolidFillProgram : GLProgram {
     VAO vao;
     VBO vbo;
     bool needToCreateVAO = true;
-    void createVAO(float[] vertices, float[] colors) {
-        if(vao)
-            destroy(vao);
+    protected void createVAO(float[] vertices, float[] colors) {
         vao = new VAO;
-
-        if(vbo)
-            destroy(vbo);
         vbo = new VBO;
 
         glVertexAttribPointer(vertexLocation, 3, GL_FLOAT, GL_FALSE, 0, cast(void*) 0);
@@ -310,7 +305,7 @@ class SolidFillProgram : GLProgram {
         needToCreateVAO = false;
     }
 
-    void beforeExecute() {
+    protected void beforeExecute() {
         glEnable(GL_BLEND);
         checkgl!glDisable(GL_CULL_FACE);
         checkgl!glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
@@ -334,6 +329,14 @@ class SolidFillProgram : GLProgram {
         vao.unbind();
         return true;
     }
+
+    void destroyBuffers() {
+        destroy(vao);
+        destroy(vbo);
+        vao = null;
+        vbo = null;
+        needToCreateVAO = true;
+    }
 }
 
 class LineProgram : SolidFillProgram {
@@ -392,13 +395,8 @@ class TextureProgram : SolidFillProgram {
         return res && texCoordLocation >= 0;
     }
 
-    void createVAO(float[] vertices, float[] colors, float[] texcoords) {
-        if(vao)
-            destroy(vao);
+    protected void createVAO(float[] vertices, float[] colors, float[] texcoords) {
         vao = new VAO;
-
-        if(vbo)
-            destroy(vbo);
         vbo = new VBO;
 
         glVertexAttribPointer(vertexLocation, 3, GL_FLOAT, GL_FALSE, 0, cast(void*) 0);
@@ -598,10 +596,10 @@ final class GLSupport {
         return true;
     }
 
-    void prepareShaders() {
-        _solidFillProgram.needToCreateVAO = true;
-        _lineProgram.needToCreateVAO = true;
-        _textureProgram.needToCreateVAO = true;
+    void destroyBuffers() {
+        _solidFillProgram.destroyBuffers();
+        _lineProgram.destroyBuffers();
+        _textureProgram.destroyBuffers();
     }
 
     void setRotation(int x, int y, int rotationAngle) {