Added working SpriteBatch.

src/modules/graphics/opengl/SpriteBatch.cpp

@@ -0,0 +1,149 @@
+/**
+* Copyright (c) 2006-2009 LOVE Development Team
+* 
+* This software is provided 'as-is', without any express or implied
+* warranty.  In no event will the authors be held liable for any damages
+* arising from the use of this software.
+* 
+* Permission is granted to anyone to use this software for any purpose,
+* including commercial applications, and to alter it and redistribute it
+* freely, subject to the following restrictions:
+* 
+* 1. The origin of this software must not be misrepresented; you must not
+*    claim that you wrote the original software. If you use this software
+*    in a product, an acknowledgment in the product documentation would be
+*    appreciated but is not required.
+* 2. Altered source versions must be plainly marked as such, and must not be
+*    misrepresented as being the original software.
+* 3. This notice may not be removed or altered from any source distribution.
+**/
+
+#include "SpriteBatch.h"
+
+// STD
+#include <iostream>
+
+// LOVE
+#include "Image.h"
+
+namespace love
+{
+namespace graphics
+{
+namespace opengl
+{
+	SpriteBatch::SpriteBatch(Image * image, int size, int usage)
+		: image(image), size(size), next(0), usage(usage)
+	{
+		image->retain();
+
+		vertices = new vertex[size*4];
+		indices = new GLushort[size*6];
+
+		for(int i = 0; i<size; i++)
+		{
+			indices[i*6+0] = 0+(i*4);
+			indices[i*6+1] = 1+(i*4);
+			indices[i*6+2] = 2+(i*4);
+
+			indices[i*6+3] = 0+(i*4);
+			indices[i*6+4] = 2+(i*4);
+			indices[i*6+5] = 3+(i*4);
+		}
+
+		// Find out which OpenGL VBO usage hint to use.
+		gl_usage = GL_STREAM_DRAW;
+		gl_usage = (usage == USAGE_DYNAMIC) ? GL_DYNAMIC_DRAW : gl_usage;
+		gl_usage = (usage == USAGE_STATIC) ? GL_STATIC_DRAW : gl_usage;
+		gl_usage = (usage == USAGE_STREAM) ? GL_STREAM_DRAW : gl_usage;
+
+		glGenBuffers(2, vbo);
+
+		glBindBuffer(GL_ARRAY_BUFFER, vbo[0]);
+		glBufferData(GL_ARRAY_BUFFER, sizeof(vertex)*size*4, vertices, gl_usage);
+		glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vbo[1]);
+		glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(GLuint)*size*6, indices, GL_STATIC_DRAW);
+		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+
+	}
+
+	SpriteBatch::~SpriteBatch()
+	{
+		image->release();
+
+		if(vbo[0] != 0 && vbo[1] != 0)
+			glDeleteBuffers(2, vbo);
+
+		delete [] vertices;
+		delete [] indices;
+	}
+
+	void SpriteBatch::add(float x, float y, float a, float sx, float sy, float ox, float oy)
+	{
+		// Only do this if there's a free slot.
+		if(next < size)
+		{
+			// Get a pointer to the correct insertion position.
+			vertex * v = vertices + next*4;
+
+			memcpy(v, image->getVertices(), sizeof(vertex)*4);
+
+			// Transform.
+			Matrix t;
+			t.translate(x, y);
+			t.scale(sx, sy);
+			t.rotate(a);
+			t.transform(v, v, 4);
+
+			glBindBuffer(GL_ARRAY_BUFFER, vbo[0]);
+			glBufferSubData(GL_ARRAY_BUFFER, (next*4)*sizeof(vertex), sizeof(vertex)*4, v);
+			glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+			// Increment counter.
+			next++;			
+		}
+	}
+
+	void SpriteBatch::clear()
+	{
+		// Reset the position of the next index.
+		next = 0;
+	}
+
+	void SpriteBatch::draw(float x, float y, float angle, float sx, float sy, float ox, float oy) const
+	{
+		glPushMatrix();
+		glTranslatef(x, y, 0);
+
+		image->bind();
+
+		// Enable vertex arrays.
+		glEnableClientState(GL_VERTEX_ARRAY);
+		glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+		glEnableClientState(GL_COLOR_ARRAY);
+
+		// Bind the VBO buffer.
+		glBindBuffer(GL_ARRAY_BUFFER, vbo[0]);
+		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vbo[1]);
+		glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(vertex), (GLvoid*)0);
+		glVertexPointer(2, GL_FLOAT, sizeof(vertex), (GLvoid*)(sizeof(unsigned char)*4));
+		glTexCoordPointer(2, GL_FLOAT, sizeof(vertex), (GLvoid*)(sizeof(unsigned char)*4+sizeof(float)*2));
+		
+		glDrawElements(GL_TRIANGLES, next*6, GL_UNSIGNED_SHORT, 0);
+
+		// Disable vertex arrays.
+		glDisableClientState(GL_COLOR_ARRAY);
+		glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+		glDisableClientState(GL_VERTEX_ARRAY);
+
+		glBindBuffer(GL_ARRAY_BUFFER, 0);
+		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+
+		glPopMatrix();
+	}
+
+} // opengl
+} // graphics
+} // love