add initial examples, replacing the 'Demos/Demos3'. Will make it work cross-platform, OpenGL3/OpenGL2 and add more examples to it.

examples/ExampleBrowser/GwenGUISupport/GraphingTexture.cpp

@@ -0,0 +1,189 @@
+#include "GraphingTexture.h"
+#include "../OpenGLWindow/OpenGLInclude.h"
+#include <assert.h>
+
+GraphingTexture::GraphingTexture()
+:m_textureId(0),
+m_width(0),
+m_height(0)
+{
+}
+
+GraphingTexture::~GraphingTexture()
+{
+	destroy();
+}
+
+void GraphingTexture::destroy()
+{
+	//TODO(erwincoumans) release memory etc...
+	m_width = 0;
+	m_height=0;
+	glDeleteTextures(1,(GLuint*)&m_textureId);
+	m_textureId=0;
+}
+
+bool GraphingTexture::create(int texWidth, int texHeight)
+{
+	m_width = texWidth;
+	m_height = texHeight;
+	glActiveTexture(GL_TEXTURE0);
+	
+	m_imageData.resize(texWidth*texHeight*4);
+	for(int y=0;y<texHeight;++y)
+	{
+		//					const int	t=y>>5;
+		GLubyte*	pi=&m_imageData[y*texWidth*4];
+		for(int x=0;x<texWidth;++x)
+		{
+			if (x>=y)//x<2||y<2||x>253||y>253)
+			{
+				pi[0]=0;
+				pi[1]=0;
+				pi[2]=255;
+				pi[3]=255;
+			} else
+			{
+				pi[0]=255;
+				pi[1]=0;
+				pi[2]=0;
+				pi[3]=255;
+			}
+			
+			pi+=4;
+		}
+	}
+	
+	
+	glGenTextures(1,(GLuint*)&m_textureId);
+	
+	uploadImageData();
+	return true;
+}
+
+void GraphingTexture::uploadImageData()
+{
+	glBindTexture(GL_TEXTURE_2D,m_textureId);
+	assert(glGetError()==GL_NO_ERROR);
+	
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, m_width,m_height,0,GL_RGBA,GL_UNSIGNED_BYTE,&m_imageData[0]);
+	glGenerateMipmap(GL_TEXTURE_2D);
+	
+	assert(glGetError()==GL_NO_ERROR);
+	
+	
+}
+
+#if 0
+//shift the image one pixel
+for(int y=0;y<texHeight;++y)
+{
+	//					const int	t=y>>5;
+	for(int x=1;x<texWidth;++x)
+	{
+		GLubyte*	org=image+(x+y*texWidth)*4;
+		
+		GLubyte*	dst=image+(x-1+y*texWidth)*4;
+		
+		dst[0] = org[0];
+		dst[1] = org[1];
+		dst[2] = org[2];
+		dst[3] = org[3];
+	}
+}
+//render a new row at the right
+for(int y=0;y<texHeight;++y)
+{
+	GLubyte*	pi=image+(texWidth-1+y*texWidth)*4;
+	pi[0]=255;
+	pi[1]=255;
+	pi[2]=255;
+	pi[3]=255;
+	if (y==texHeight*0.5)
+	{
+		pi[0]=200;
+		pi[1]=200;
+		pi[2]=200;
+		pi[3]=255;
+	}
+	
+}
+
+{
+	static float timer = 0.f;
+	static int prevValue=0;
+	timer+= 0.01;
+	float value = 128+100*sinf(timer);
+	MyClamp(value,0.f,float(texHeight-1));
+	GLubyte*	org=image+(texWidth-1+(int)value*texWidth)*4;
+	org[0] = 0;
+	org[1] = 0;
+	org[2] = 0;
+	org[3] = 255;
+	
+	if (prevValue<value)
+	{
+		
+	} else
+	{
+		
+	}
+	
+}
+
+{
+	static float timer = 1.4f;
+	timer+= 0.04;
+	float value = 128+150*sinf(timer);
+	MyClamp(value,0.f,float(texHeight-1));
+	
+	GLubyte*	org=image+(texWidth-1+(int)value*texWidth)*4;
+	org[0] = 0;
+	org[1] = 255;
+	org[2] = 0;
+	org[3] = 255;
+}
+
+{
+	static float timer = 1.4f;
+	timer+= 0.02;
+	float value =256+400*sinf(timer);
+	MyClamp(value,0.f,float(texHeight-1));
+	static int prevValue = 0;
+	
+	GLubyte*	org=image+(texWidth-1+(int)value*texWidth)*4;
+	org[0] = 0;
+	org[1] = 0;
+	org[2] = 255;
+	org[3] = 255;
+	
+	if (prevValue<value)
+	{
+		for (int i=prevValue;i<value;i++)
+		{
+			GLubyte*	org=image+(texHeight-1+(int)i*texWidth)*4;
+			org[0] = 0;
+			org[1] = 0;
+			org[2] = 255;
+			org[3] = 255;
+		}
+	} else
+	{
+		for (int i=value;i<prevValue;i++)
+		{
+			GLubyte*	org=image+(texHeight-1+(int)i*texWidth)*4;
+			org[0] = 0;
+			org[1] = 0;
+			org[2] = 255;
+			org[3] = 255;
+		}
+	}
+	prevValue = value;
+}
+
+
+glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texWidth,texHeight,0,GL_RGBA,GL_UNSIGNED_BYTE,image);
+glGenerateMipmap(GL_TEXTURE_2D);
+
+#endif
+