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render the actual polygons instead of the stencil buffer

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This commit is contained in:
Konstantin Käfer
2014-02-17 17:49:50 +01:00
parent 3843bf1ce5
commit fc29d2116b
1 changed files with 43 additions and 40 deletions
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83
src/renderer/painter.cpp
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@@ -180,49 +180,49 @@ void Painter::renderFill(FillBucket& bucket, const std::string& layer_name, cons
fill_color[2] *= properties.opacity;
fill_color[3] *= properties.opacity;
// Draw the stencil mask.
{
// We're only drawing to the first seven bits (== support a maximum of
// 127 overlapping polygons in one place before we get rendering errors).
glStencilMask(0x3F);
glClear(GL_STENCIL_BUFFER_BIT);
// // Draw the stencil mask.
// {
// // We're only drawing to the first seven bits (== support a maximum of
// // 127 overlapping polygons in one place before we get rendering errors).
// glStencilMask(0x3F);
// glClear(GL_STENCIL_BUFFER_BIT);
// Draw front facing triangles. Wherever the 0x80 bit is 1, we are
// increasing the lower 7 bits by one if the triangle is a front-facing
// triangle. This means that all visible polygons should be in CCW
// orientation, while all holes (see below) are in CW orientation.
glStencilFunc(GL_NOTEQUAL, 0x80, 0x80);
// // Draw front facing triangles. Wherever the 0x80 bit is 1, we are
// // increasing the lower 7 bits by one if the triangle is a front-facing
// // triangle. This means that all visible polygons should be in CCW
// // orientation, while all holes (see below) are in CW orientation.
// glStencilFunc(GL_NOTEQUAL, 0x80, 0x80);
if (properties.winding == Winding::EvenOdd) {
// When we draw an even/odd winding fill, we just invert all the bits.
glStencilOp(GL_INVERT, GL_KEEP, GL_KEEP);
} else {
// When we do a nonzero fill, we count the number of times a pixel is
// covered by a counterclockwise polygon, and subtract the number of
// times it is "uncovered" by a clockwise polygon.
glStencilOpSeparate(GL_FRONT, GL_INCR_WRAP, GL_KEEP, GL_KEEP);
glStencilOpSeparate(GL_BACK, GL_DECR_WRAP, GL_KEEP, GL_KEEP);
}
// if (properties.winding == Winding::EvenOdd) {
// // When we draw an even/odd winding fill, we just invert all the bits.
// glStencilOp(GL_INVERT, GL_KEEP, GL_KEEP);
// } else {
// // When we do a nonzero fill, we count the number of times a pixel is
// // covered by a counterclockwise polygon, and subtract the number of
// // times it is "uncovered" by a clockwise polygon.
// glStencilOpSeparate(GL_FRONT, GL_INCR_WRAP, GL_KEEP, GL_KEEP);
// glStencilOpSeparate(GL_BACK, GL_DECR_WRAP, GL_KEEP, GL_KEEP);
// }
// When drawing a shape, we first draw all shapes to the stencil buffer
// and incrementing all areas where polygons are
glColorMask(false, false, false, false);
// // When drawing a shape, we first draw all shapes to the stencil buffer
// // and incrementing all areas where polygons are
// glColorMask(false, false, false, false);
// Draw the actual triangle fan into the stencil buffer.
useProgram(plainShader->program);
plainShader->setMatrix(matrix);
// // Draw the actual triangle fan into the stencil buffer.
// useProgram(plainShader->program);
// plainShader->setMatrix(matrix);
// Draw all groups
bucket.drawElements(*plainShader);
// // Draw all groups
// bucket.drawElements(*plainShader);
// Now that we have the stencil mask in the stencil buffer, we can start
// writing to the color buffer.
glColorMask(true, true, true, true);
}
// // Now that we have the stencil mask in the stencil buffer, we can start
// // writing to the color buffer.
// glColorMask(true, true, true, true);
// }
// From now on, we don't want to update the stencil buffer anymore.
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
glStencilMask(0x0);
// glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
// glStencilMask(0x0);
// Because we're drawing top-to-bottom, and we update the stencil mask
// below, we have to draw the outline first (!)
@@ -252,8 +252,8 @@ void Painter::renderFill(FillBucket& bucket, const std::string& layer_name, cons
bucket.drawVertices(*outlineShader);
}
// Only draw regions that we marked
glStencilFunc(GL_NOTEQUAL, 0x0, 0x3F);
// // Only draw regions that we marked
// glStencilFunc(GL_NOTEQUAL, 0x0, 0x3F);
if (false && properties.image.size() && *style.sprite) {
// Draw texture fill
@@ -292,12 +292,15 @@ void Painter::renderFill(FillBucket& bucket, const std::string& layer_name, cons
plainShader->setMatrix(matrix);
plainShader->setColor(fill_color);
// Draw the actual triangle fan into the stencil buffer.
bucket.drawElements(*plainShader);
// Draw a rectangle that covers the entire viewport.
coveringPlainArray.bind(*plainShader, tileStencilBuffer, BUFFER_OFFSET(0));
glDrawArrays(GL_TRIANGLES, 0, tileStencilBuffer.index());
// coveringPlainArray.bind(*plainShader, tileStencilBuffer, BUFFER_OFFSET(0));
// glDrawArrays(GL_TRIANGLES, 0, tileStencilBuffer.index());
}
glStencilFunc(GL_EQUAL, 0x80, 0x80);
// glStencilFunc(GL_EQUAL, 0x80, 0x80);
}
void Painter::renderLine(LineBucket& bucket, const std::string& layer_name, const Tile::ID& id) {