add reverse image shader

Change-Id: Ibd3aff8aeb71626dada762b53cde8f50f7fbf812

chart2/Package_opengl.mk

@@ -22,6 +22,8 @@ $(eval $(call gb_Package_add_files,chart2_opengl_shader,$(LIBO_BIN_FOLDER)/openg
 	textVertexShader.glsl \
 	shape3DFragmentShader.glsl \
 	shape3DVertexShader.glsl \
+	renderTextureVertexShader.glsl \
+	renderTextureFragmentShader.glsl \
 ))
 
 # vim: set noet sw=4 ts=4:

chart2/opengl/renderTextureFragmentShader.glsl

@@ -0,0 +1,18 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+uniform sampler2D RenderTex;
+varying vec2 vTexCoord;
+
+void main()
+{
+    gl_FragColor = vec4(texture2D(RenderTex, vTexCoord).rgb, 1.0);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

chart2/opengl/renderTextureVertexShader.glsl

@@ -0,0 +1,19 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+attribute vec4 vPosition;
+attribute vec2 texCoord;
+varying vec2 vTexCoord;
+void main()
+{
+    gl_Position =  vPosition;
+    vTexCoord = texCoord;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

chart2/source/view/inc/GL3DRenderer.hxx

@@ -235,6 +235,7 @@ private:
                                int iSubDivZ, float width, float height, float depth);
     void CreateSceneBoxView();
     void CreateBMPHeader(sal_uInt8 *bmpHeader, int xsize, int ysize);
+    void RenderTexture(GLuint TexID);
 private:
     // Projection matrix : default 45 degree Field of View, 4:3 ratio, display range : 0.1 unit <-> 100 units
     glm::mat4 m_Projection;
@@ -353,6 +354,17 @@ private:
     GLint m_2DVertexID;
     GLint m_2DColorID;
 
+    GLint m_RenderProID;
+
+    GLuint m_RenderVertexBuf;
+
+    GLuint m_RenderTexCoordBuf;
+
+    GLint m_RenderTexID;
+
+    GLint m_RenderVertexID;
+
+    GLint m_RenderTexCoordID;
     //TODO: moggi: kill the following parts
     // don't add anything below or I will remove it
 #if 0

chart2/source/view/inc/StaticGeometry.h

@@ -104,7 +104,7 @@ static const GLfloat boundBoxNormal[] = {
     1.0f, 0.0f, 0.0f//12
 };
 
-GLfloat coordinateAxis[] = {
+static GLfloat coordinateAxis[] = {
       -1.0, 0.0, 0.0,
       1.0, 0.0, 0.0,//x
       0.0, 0.0, -1.0,
@@ -113,3 +113,18 @@ GLfloat coordinateAxis[] = {
       0.0, 1.0, 0.0//y
 };
 
+static GLfloat coordReverseVertices[] = {
+    0.0f, 1.0f,
+    1.0f, 1.0f,
+    1.0f, 0.0f,
+    0.0f, 0.0f,
+};
+
+static GLfloat squareVertices[] = {
+    -1.0f, -1.0f, -1.0,
+    1.0f, -1.0f, -1.0,
+    1.0f,  1.0f, -1.0,
+    -1.0f,  1.0f, -1.0
+};
+
+

chart2/source/view/main/GL3DRenderer.cxx

@@ -127,6 +127,12 @@ void OpenGL3DRenderer::LoadShaders()
     m_MatrixID = glGetUniformLocation(m_CommonProID, "MVP");
     m_2DVertexID = glGetAttribLocation(m_CommonProID, "vPosition");
     m_2DColorID = glGetUniformLocation(m_CommonProID, "vColor");
+
+    m_RenderProID = OpenGLHelper::LoadShaders("renderTextureVertexShader", "renderTextureFragmentShader");
+    m_RenderVertexID = glGetAttribLocation(m_RenderProID, "vPosition");
+    m_RenderTexCoordID = glGetAttribLocation(m_RenderProID, "texCoord");
+    m_RenderTexID = glGetUniformLocation(m_RenderProID, "RenderTex");
+    printf("m_RenderProID = %d, m_RenderVertexID = %d\n", m_RenderProID, m_RenderVertexID);
     CHECK_GL_ERROR();
 }
 
@@ -181,7 +187,6 @@ void OpenGL3DRenderer::CreateFrameBufferObj()
         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, m_RboID[i]);
         glCheckFramebufferStatus(GL_FRAMEBUFFER);
         glBindRenderbuffer(GL_RENDERBUFFER, 0);
-        glBindFramebuffer(GL_FRAMEBUFFER, m_FboID[0]);
     }
 }
 
@@ -197,7 +202,40 @@ void OpenGL3DRenderer::SetCameraInfo(glm::vec3 pos, glm::vec3 direction, glm::ve
     m_CameraInfo.cameraUp = up;
 }
 
+void OpenGL3DRenderer::RenderTexture(GLuint TexID)
+{
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
+    glUseProgram(m_RenderProID);
+
+    glEnableVertexAttribArray(m_RenderVertexID);
+    glBindBuffer(GL_ARRAY_BUFFER, m_RenderVertexBuf);
+    glVertexAttribPointer(
+        m_RenderVertexID,                  // attribute. No particular reason for 0, but must match the layout in the shader.
+        3,                  // size
+        GL_FLOAT,           // type
+        GL_FALSE,           // normalized?
+        0,                  // stride
+        (void*)0            // array buffer offset
+        );
+    glEnableVertexAttribArray(m_RenderTexCoordID);
+    glBindBuffer(GL_ARRAY_BUFFER, m_RenderTexCoordBuf);
+    glVertexAttribPointer(
+        m_RenderTexCoordID,                  // attribute. No particular reason for 0, but must match the layout in the shader.
+        2,                  // size
+        GL_FLOAT,           // type
+        GL_FALSE,           // normalized?
+        0,                  // stride
+        (void*)0            // array buffer offset
+        );
+    glBindTexture(GL_TEXTURE_2D, TexID);
+    glUniform1i(m_RenderTexID, 0);
+    glDrawArrays(GL_QUADS, 0, 4);
+    glDisableVertexAttribArray(m_RenderTexCoordID);
+    glDisableVertexAttribArray(m_RenderVertexID);
+    glBindTexture(GL_TEXTURE_2D, 0);
+    glUseProgram(0);
+}
 
 void OpenGL3DRenderer::init()
 {
@@ -251,6 +289,17 @@ void OpenGL3DRenderer::init()
     glBindBuffer(GL_ARRAY_BUFFER, m_TextTexCoordBuf);
     glBufferData(GL_ARRAY_BUFFER, sizeof(texCoords), texCoords, GL_STATIC_DRAW);
     glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+    glGenBuffers(1, &m_RenderTexCoordBuf);
+    glBindBuffer(GL_ARRAY_BUFFER, m_RenderTexCoordBuf);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(coordReverseVertices), coordReverseVertices, GL_STATIC_DRAW);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+    glGenBuffers(1, &m_RenderVertexBuf);
+    glBindBuffer(GL_ARRAY_BUFFER, m_RenderVertexBuf);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(squareVertices), squareVertices, GL_STATIC_DRAW);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+
     CHECK_GL_ERROR();
     Init3DUniformBlock();
 
@@ -1526,11 +1575,6 @@ void OpenGL3DRenderer::ProcessUnrenderedShape()
 #if 1
     if ((!m_FboID[0]) || (!m_FboID[1]))
     {
-        // create a texture object
-        CreateTextureObj(m_iWidth, m_iHeight);
-        //create render buffer object
-        CreateRenderObj(m_iWidth, m_iHeight);
-        //create fbo
         CreateFrameBufferObj();
     }
     glBindFramebuffer(GL_FRAMEBUFFER, m_FboID[0]);
@@ -1546,6 +1590,9 @@ void OpenGL3DRenderer::ProcessUnrenderedShape()
     RenderTextShape();
     //render the axis
     RenderCoordinateAxis();
+    glBindFramebuffer(GL_FRAMEBUFFER, m_FboID[1]);
+    glViewport(0, 0, m_iWidth, m_iHeight);
+    RenderTexture(m_TextureObj[0]);
 #if DEBUG_FBO
     char fileName[256] = {0};
     sprintf(fileName, "D://shaderout_%d_%d.bmp", m_iWidth, m_iHeight);