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use 0x80 as stencil buffer CLIP_BIT

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This commit is contained in:
Hannes Janetzek 2013-01-30 15:25:31 +01:00
parent db93fbe4f6
commit f93d0944a3
2 changed files with 28 additions and 36 deletions
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13
src/org/oscim/renderer/GLRenderer.java
View File

@ -551,6 +551,11 @@ public class GLRenderer implements GLSurfaceView.Renderer {
//GLES20.glScissor(0, 0, width, height);
//GLES20.glEnable(GLES20.GL_SCISSOR_TEST);
GLES20.glClearStencil(0x00);
GLES20.glDisable(GLES20.GL_CULL_FACE);
GLES20.glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
if (!mNewSurface) {
mMapView.redrawMap();
return;
@ -585,14 +590,6 @@ public class GLRenderer implements GLSurfaceView.Renderer {
TextureRenderer.init();
TextureObject.init(10);
//GLES20.glEnable(GLES20.GL_SCISSOR_TEST);
// set all bits on clear
GLES20.glClearStencil(0xFF);
//GLES20.glClearStencil(0);
GLES20.glDisable(GLES20.GL_CULL_FACE);
GLES20.glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
mNewSurface = true;
}

51
src/org/oscim/renderer/PolygonRenderer.java
View File

@ -21,7 +21,6 @@ import static android.opengl.GLES20.GL_INVERT;
import static android.opengl.GLES20.GL_SHORT;
import static android.opengl.GLES20.GL_TRIANGLE_FAN;
import static android.opengl.GLES20.GL_TRIANGLE_STRIP;
import static android.opengl.GLES20.GL_ZERO;
import static android.opengl.GLES20.glColorMask;
import static android.opengl.GLES20.glDepthMask;
import static android.opengl.GLES20.glDisable;
@ -53,6 +52,7 @@ public final class PolygonRenderer {
// private static final int NUM_VERTEX_SHORTS = 2;
private static final int POLYGON_VERTICES_DATA_POS_OFFSET = 0;
private static final int STENCIL_BITS = 8;
private final static int CLIP_BIT = 0x80;
private static final float FADE_START = 1.3f;
@ -144,7 +144,7 @@ public final class PolygonRenderer {
// set stencil buffer mask used to draw this layer
// also check that clip bit is 0 to avoid overdraw
// of other tiles
glStencilFunc(GL_EQUAL, 0x7f, 0x80 | 1 << c);
glStencilFunc(GL_EQUAL, 0xff, CLIP_BIT | 1 << c);
/* draw tile fill coordinates */
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
@ -173,13 +173,13 @@ public final class PolygonRenderer {
* mvp matrix
* @param first
* pass true to clear stencil buffer region
* @param drawClipped
* @param clip
* clip to first quad in current vbo
* @return
* next layer
*/
public static Layer draw(MapPosition pos, Layer layer,
float[] matrix, boolean first, boolean drawClipped) {
float[] matrix, boolean first, boolean clip) {
int zoom = pos.zoomLevel;
float scale = pos.scale;
@ -195,8 +195,7 @@ public final class PolygonRenderer {
// reset start when only one layer left in stencil buffer
if (first || mCount > 5) {
mCount = 0;
mStart = 0;
mStart = mCount = 0;
} else {
mStart = mCount;
}
@ -213,7 +212,7 @@ public final class PolygonRenderer {
continue;
if (mCount == mStart) {
drawStencilRegion(drawClipped, first);
drawStencilRegion(clip, first);
first = false;
// op for stencil method polygon drawing
@ -230,24 +229,23 @@ public final class PolygonRenderer {
// draw up to 7 layers into stencil buffer
if (mCount == STENCIL_BITS - 1) {
fillPolygons(zoom, scale);
mCount = 0;
mStart = 0;
mStart = mCount = 0;
}
}
if (mCount > 0)
fillPolygons(zoom, scale);
if (drawClipped) {
if (clip) {
if (first) {
drawStencilRegion(drawClipped, first);
drawStencilRegion(clip, first);
// disable writes to stencil buffer
glStencilMask(0x00);
// enable writes to color buffer
glColorMask(true, true, true, false);
}
// clip to the region where highest bit is zero
glStencilFunc(GL_EQUAL, 0x00, 0x80);
// clip to tile region
glStencilFunc(GL_EQUAL, CLIP_BIT, CLIP_BIT);
}
return l;
@ -261,31 +259,28 @@ public final class PolygonRenderer {
// write to all bits
glStencilMask(0xFF);
// zero out area to draw to
glStencilOp(GLES20.GL_KEEP, GLES20.GL_KEEP, GL_ZERO);
// set clip bit (0x80) for draw region
glStencilOp(GLES20.GL_KEEP, GLES20.GL_KEEP, GLES20.GL_REPLACE);
if (clip) {
if (first) {
// draw clip-region into depth and stencil buffer:
// this is used for tile line and polygon layers
// always pass stencil test:
glStencilFunc(GL_ALWAYS, 0x00, 0x00);
GLES20.glEnable(GLES20.GL_POLYGON_OFFSET_FILL);
// test depth. stencil passes always, just keep it enabled
// test depth and write to depth buffer
GLState.test(true, true);
// write to depth buffer
glDepthMask(true);
}
}
if (!clip || first) {
// always pass stencil test:
glStencilFunc(GL_ALWAYS, 0x00, 0x00);
glStencilFunc(GL_ALWAYS, CLIP_BIT, CLIP_BIT);
} else {
// use clip region from stencil buffer
glStencilFunc(GL_EQUAL, 0x00, 0x80);
// to clear stencil 'layer-bits' (0x7f)
glStencilFunc(GL_EQUAL, CLIP_BIT, CLIP_BIT);
}
// draw a quad for the tile region
@ -303,7 +298,7 @@ public final class PolygonRenderer {
}
if (first) {
glStencilFunc(GL_EQUAL, 0x00, 0x80);
glStencilFunc(GL_EQUAL, CLIP_BIT, CLIP_BIT);
}
}
@ -324,11 +319,11 @@ public final class PolygonRenderer {
glColorMask(false, false, false, false);
// always pass stencil test:
glStencilFunc(GL_ALWAYS, 0xFF, 0xFF);
glStencilFunc(GL_ALWAYS, 0x00, 0x00);
// write to all bits
glStencilMask(0xFF);
// zero out area to draw to
glStencilOp(GLES20.GL_KEEP, GLES20.GL_KEEP, GLES20.GL_REPLACE);
glStencilOp(GLES20.GL_KEEP, GLES20.GL_KEEP, GLES20.GL_ZERO);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glColorMask(true, true, true, true);