package org.newdawn.slick.geom;
import org.newdawn.slick.Image;
import org.newdawn.slick.ShapeFill;
import org.newdawn.slick.opengl.Texture;
import org.newdawn.slick.opengl.TextureImpl;
import org.newdawn.slick.opengl.renderer.LineStripRenderer;
import org.newdawn.slick.opengl.renderer.Renderer;
import org.newdawn.slick.opengl.renderer.SGL;
/**
* @author Mark Bernard
*
* Use this class to render shpaes directly to OpenGL. Allows you to bypass the Graphics class.
*/
public final class ShapeRenderer {
/** The renderer to use for all GL operations */
private static SGL GL = Renderer.get();
/** The renderer to use line strips */
private static LineStripRenderer LSR = Renderer.getLineStripRenderer();
/**
* Draw the outline of the given shape. Only the vertices are set.
* The colour has to be set independently of this method.
*
* @param shape The shape to draw.
*/
public static final void draw(Shape shape) {
Texture t = TextureImpl.getLastBind();
TextureImpl.bindNone();
float points[] = shape.getPoints();
LSR.start();
for(int i=0;i<points.length;i+=2) {
LSR.vertex(points[i], points[i + 1]);
}
if (shape.closed()) {
LSR.vertex(points[0], points[1]);
}
LSR.end();
if (t == null) {
TextureImpl.bindNone();
} else {
t.bind();
}
}
/**
* Draw the outline of the given shape. Only the vertices are set.
* The colour has to be set independently of this method.
*
* @param shape The shape to draw.
* @param fill The fill to apply
*/
public static final void draw(Shape shape, ShapeFill fill) {
float points[] = shape.getPoints();
Texture t = TextureImpl.getLastBind();
TextureImpl.bindNone();
float center[] = shape.getCenter();
GL.glBegin(SGL.GL_LINE_STRIP);
for(int i=0;i<points.length;i+=2) {
fill.colorAt(shape, points[i], points[i + 1]).bind();
Vector2f offset = fill.getOffsetAt(shape, points[i], points[i + 1]);
GL.glVertex2f(points[i] + offset.x, points[i + 1] + offset.y);
}
if (shape.closed()) {
fill.colorAt(shape, points[0], points[1]).bind();
Vector2f offset = fill.getOffsetAt(shape, points[0], points[1]);
GL.glVertex2f(points[0] + offset.x, points[1] + offset.y);
}
GL.glEnd();
if (t == null) {
TextureImpl.bindNone();
} else {
t.bind();
}
}
/**
* Check there are enough points to fill
*
* @param shape THe shape we're drawing
* @return True if the fill is valid
*/
public static boolean validFill(Shape shape) {
if (shape.getTriangles() == null) {
return false;
}
return shape.getTriangles().getTriangleCount() != 0;
}
/**
* Draw the the given shape filled in. Only the vertices are set.
* The colour has to be set independently of this method.
*
* @param shape The shape to fill.
*/
public static final void fill(Shape shape) {
if (!validFill(shape)) {
return;
}
Texture t = TextureImpl.getLastBind();
TextureImpl.bindNone();
fill(shape, new PointCallback() {
public float[] preRenderPoint(Shape shape, float x, float y) {
// do nothing, we're just filling the shape this time
return null;
}
});
if (t == null) {
TextureImpl.bindNone();
} else {
t.bind();
}
}
/**
* Draw the the given shape filled in. Only the vertices are set.
* The colour has to be set independently of this method.
*
* @param shape The shape to fill.
* @param callback The callback that will be invoked for each shape point
*/
private static final void fill(Shape shape, PointCallback callback) {
Triangulator tris = shape.getTriangles();
GL.glBegin(SGL.GL_TRIANGLES);
for (int i=0;i<tris.getTriangleCount();i++) {
for (int p=0;p<3;p++) {
float[] pt = tris.getTrianglePoint(i, p);
float[] np = callback.preRenderPoint(shape, pt[0],pt[1]);
if (np == null) {
GL.glVertex2f(pt[0],pt[1]);
} else {
GL.glVertex2f(np[0],np[1]);
}
}
}
GL.glEnd();
}
/**
* Draw the the given shape filled in with a texture. Only the vertices are set.
* The colour has to be set independently of this method.
*
* @param shape The shape to texture.
* @param image The image to tile across the shape
*/
public static final void texture(Shape shape, Image image) {
texture(shape, image, 0.01f, 0.01f);
}
/**
* Draw the the given shape filled in with a texture. Only the vertices are set.
* The colour has to be set independently of this method. This method is required to
* fit the texture once across the shape.
*
* @param shape The shape to texture.
* @param image The image to tile across the shape
*/
public static final void textureFit(Shape shape, Image image) {
textureFit(shape, image,1f,1f);
}
/**
* Draw the the given shape filled in with a texture. Only the vertices are set.
* The colour has to be set independently of this method.
*
* @param shape The shape to texture.
* @param image The image to tile across the shape
* @param scaleX The scale to apply on the x axis for texturing
* @param scaleY The scale to apply on the y axis for texturing
*/
public static final void texture(Shape shape, final Image image, final float scaleX, final float scaleY) {
if (!validFill(shape)) {
return;
}
final Texture t = TextureImpl.getLastBind();
image.getTexture().bind();
fill(shape, new PointCallback() {
public float[] preRenderPoint(Shape shape, float x, float y) {
float tx = x * scaleX;
float ty = y * scaleY;
tx = image.getTextureOffsetX() + (image.getTextureWidth() * tx);
ty = image.getTextureOffsetY() + (image.getTextureHeight() * ty);
GL.glTexCoord2f(tx, ty);
return null;
}
});
float points[] = shape.getPoints();
if (t == null) {
TextureImpl.bindNone();
} else {
t.bind();
}
}
/**
* Draw the the given shape filled in with a texture. Only the vertices are set.
* The colour has to be set independently of this method. This method is required to
* fit the texture scaleX times across the shape and scaleY times down the shape.
*
* @param shape The shape to texture.
* @param image The image to tile across the shape
* @param scaleX The scale to apply on the x axis for texturing
* @param scaleY The scale to apply on the y axis for texturing
*/
public static final void textureFit(Shape shape, final Image image, final float scaleX, final float scaleY) {
if (!validFill(shape)) {
return;
}
float points[] = shape.getPoints();
Texture t = TextureImpl.getLastBind();
image.getTexture().bind();
final float minX = shape.getX();
final float minY = shape.getY();
final float maxX = shape.getMaxX() - minX;
final float maxY = shape.getMaxY() - minY;
fill(shape, new PointCallback() {
public float[] preRenderPoint(Shape shape, float x, float y) {
x -= shape.getMinX();
y -= shape.getMinY();
x /= (shape.getMaxX() - shape.getMinX());
y /= (shape.getMaxY() - shape.getMinY());
float tx = x * scaleX;
float ty = y * scaleY;
tx = image.getTextureOffsetX() + (image.getTextureWidth() * tx);
ty = image.getTextureOffsetY() + (image.getTextureHeight() * ty);
GL.glTexCoord2f(tx, ty);
return null;
}
});
if (t == null) {
TextureImpl.bindNone();
} else {
t.bind();
}
}
/**
* Draw the the given shape filled in. Only the vertices are set.
* The colour has to be set independently of this method.
*
* @param shape The shape to fill.
* @param fill The fill to apply
*/
public static final void fill(final Shape shape, final ShapeFill fill) {
if (!validFill(shape)) {
return;
}
Texture t = TextureImpl.getLastBind();
TextureImpl.bindNone();
final float center[] = shape.getCenter();
fill(shape, new PointCallback() {
public float[] preRenderPoint(Shape shape, float x, float y) {
fill.colorAt(shape, x, y).bind();
Vector2f offset = fill.getOffsetAt(shape, x, y);
return new float[] {offset.x + x,offset.y + y};
}
});
if (t == null) {
TextureImpl.bindNone();
} else {
t.bind();
}
}
/**
* Draw the the given shape filled in with a texture. Only the vertices are set.
* The colour has to be set independently of this method.
*
* @param shape The shape to texture.
* @param image The image to tile across the shape
* @param scaleX The scale to apply on the x axis for texturing
* @param scaleY The scale to apply on the y axis for texturing
* @param fill The fill to apply
*/
public static final void texture(final Shape shape, final Image image, final float scaleX, final float scaleY, final ShapeFill fill) {
if (!validFill(shape)) {
return;
}
Texture t = TextureImpl.getLastBind();
image.getTexture().bind();
final float center[] = shape.getCenter();
fill(shape, new PointCallback() {
public float[] preRenderPoint(Shape shape, float x, float y) {
fill.colorAt(shape, x - center[0], y - center[1]).bind();
Vector2f offset = fill.getOffsetAt(shape, x, y);
x += offset.x;
y += offset.y;
float tx = x * scaleX;
float ty = y * scaleY;
tx = image.getTextureOffsetX() + (image.getTextureWidth() * tx);
ty = image.getTextureOffsetY() + (image.getTextureHeight() * ty);
GL.glTexCoord2f(tx, ty);
return new float[] {offset.x + x,offset.y + y};
}
});
if (t == null) {
TextureImpl.bindNone();
} else {
t.bind();
}
}
/**
* Draw the the given shape filled in with a texture. Only the vertices are set.
* The colour has to be set independently of this method.
*
* @param shape The shape to texture.
* @param image The image to tile across the shape
* @param gen The texture coordinate generator to create coordiantes for the shape
*/
public static final void texture(final Shape shape, Image image, final TexCoordGenerator gen) {
Texture t = TextureImpl.getLastBind();
image.getTexture().bind();
final float center[] = shape.getCenter();
fill(shape, new PointCallback() {
public float[] preRenderPoint(Shape shape, float x, float y) {
Vector2f tex = gen.getCoordFor(x, y);
GL.glTexCoord2f(tex.x, tex.y);
return new float[] {x,y};
}
});
if (t == null) {
TextureImpl.bindNone();
} else {
t.bind();
}
}
/**
* Description of some feature that will be applied to each point render
*
* @author kevin
*/
private static interface PointCallback {
/**
* Apply feature before the call to glVertex
*
* @param shape The shape the point belongs to
* @param x The x poisiton the vertex will be at
* @param y The y position the vertex will be at
* @return The new coordinates of null
*/
float[] preRenderPoint(Shape shape, float x, float y);
}
}