为什么我的精灵的纹理周围有深色阴影/线条/框架？
我正在使用 Apple 的 GLKit 手启动 OpenGL，但我在正确显示精灵时遇到了一些麻烦。问题是它们都被细黑线包围。下面的屏幕截图显示了两个矩形，其中包含包含透明度的 png 图像纹理（显然）。
围绕它们的黑色阴影绝对不是 pngS 的一部分。绿色 PNG 是在没有抗锯齿的情况下完成的，而蓝色 PNG 则具有抗锯齿边框。如果我只绘制一个精灵，黑色边框也会很明显。
代码的相关部分（希望如此......）是：
//render the scene
-(void)render
{
glClearColor(69./255., 115./255., 213./255., 1.);
glClear(GL_COLOR_BUFFER_BIT);
[shapes enumerateObjectsUsingBlock:^(AAAShape *shape, NSUInteger idx, BOOL *stop)
{
[shape renderInScene:self];
}];
}
//creating and storing the effect inside shape class
-(GLKBaseEffect *)effect
{
if(!effect)
{
effect = [[GLKBaseEffect alloc] init];
}
return effect;
}
//rendering the shape (including effect configuration)
-(void)renderInScene:(AAAScene *)scene
{
//TODO: Storing vertices in Buffer
self.effect.transform.projectionMatrix = scene.projectionMatrix;
self.effect.transform.modelviewMatrix = self.objectMatrix;
if(texture)
{
self.effect.texture2d0.enabled = GL_TRUE;
self.effect.texture2d0.envMode = GLKTextureEnvModeReplace;
self.effect.texture2d0.target = GLKTextureTarget2D;
self.effect.texture2d0.name = texture.name;
}
[self.effect prepareToDraw];
if(texture)
{
glEnableVertexAttribArray(GLKVertexAttribTexCoord0);
glVertexAttribPointer(GLKVertexAttribTexCoord0, 2, GL_FLOAT, GL_FALSE, 0, self.textureCoordinates);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
glEnableVertexAttribArray(GLKVertexAttribPosition);
glVertexAttribPointer(GLKVertexAttribPosition, 2, GL_FLOAT, GL_FALSE, 0, self.vertices);
glDrawArrays(GL_TRIANGLE_FAN, 0, self.vertexCount);
glDisableVertexAttribArray(GLKVertexAttribPosition);
if(texture)
{
glDisableVertexAttribArray(GLKVertexAttribTexCoord0);
glDisable(GL_BLEND);
}
}
有人有什么想法吗？谢谢。
I'm starting OpenGL with Apple's GLKit hand I'm having some trouble to get my sprites displayed properly. The Problem is that they all are surrounded with thin dark lines. The screen shot below shows two rectangles with a png image textures containing transparency (obviously).
The black shadows, surrounding them are definitely not part of the pngS. The green png is done without anti-aliasing the blue one has an anti-aliased border. The black border is also apparent if I draw only one sprite.
Te relevant part (hope so...) of code is:
//render the scene
-(void)render
{
glClearColor(69./255., 115./255., 213./255., 1.);
glClear(GL_COLOR_BUFFER_BIT);
[shapes enumerateObjectsUsingBlock:^(AAAShape *shape, NSUInteger idx, BOOL *stop)
{
[shape renderInScene:self];
}];
}
//creating and storing the effect inside shape class
-(GLKBaseEffect *)effect
{
if(!effect)
{
effect = [[GLKBaseEffect alloc] init];
}
return effect;
}
//rendering the shape (including effect configuration)
-(void)renderInScene:(AAAScene *)scene
{
//TODO: Storing vertices in Buffer
self.effect.transform.projectionMatrix = scene.projectionMatrix;
self.effect.transform.modelviewMatrix = self.objectMatrix;
if(texture)
{
self.effect.texture2d0.enabled = GL_TRUE;
self.effect.texture2d0.envMode = GLKTextureEnvModeReplace;
self.effect.texture2d0.target = GLKTextureTarget2D;
self.effect.texture2d0.name = texture.name;
}
[self.effect prepareToDraw];
if(texture)
{
glEnableVertexAttribArray(GLKVertexAttribTexCoord0);
glVertexAttribPointer(GLKVertexAttribTexCoord0, 2, GL_FLOAT, GL_FALSE, 0, self.textureCoordinates);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
glEnableVertexAttribArray(GLKVertexAttribPosition);
glVertexAttribPointer(GLKVertexAttribPosition, 2, GL_FLOAT, GL_FALSE, 0, self.vertices);
glDrawArrays(GL_TRIANGLE_FAN, 0, self.vertexCount);
glDisableVertexAttribArray(GLKVertexAttribPosition);
if(texture)
{
glDisableVertexAttribArray(GLKVertexAttribTexCoord0);
glDisable(GL_BLEND);
}
}
Any ideas anyone? Thank you.
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这对我有用：
This worked for me:
来吧 stackoverflowers，14 小时了，没有答案;-)。在 gamedev 上，David 花了 14 分钟才给出 这个很好的答案。投票给他吧！
Come on stackoverflowers, 14 hours and no answers ;-). On gamedev it took David 14 minutes to give this great answer. Vote him up!