cocos2d-x如何反白高亮CCSprite

最新推荐文章于 2025-07-01 10:31:39 发布

原创最新推荐文章于 2025-07-01 10:31:39 发布 · 9k 阅读

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#blend #colors #dst #float #byte #游戏

本文详细介绍了在Cocos2d-x游戏中使用glTexEnvi函数实现纯白色高亮精灵的方法，包括重写自定义精灵类、修改draw函数以动态切换高亮效果。通过简单的代码示例，展示了如何在不同场景下快速应用这一技巧，提高游戏视觉表现。

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在做游戏时遇到需要使用纯白色高亮精灵的场合，尝试了很多办法没有解决问题，目前有以下几种解法：

1. 最简单当然是切换成和精灵图片一样的另一张纯白图片。

2. 使用glTexEnvi。具体如下：

2.1 重写一个类继承CCSprite

2.2 改写draw 函数如下：

void YourSprite::setHightlight(bool hightlight)
{
if (m_hightlight != hightlight)
{
m_hightlight = hightlight;
if (m_hightlight)
{
ccBlendFunc blendFunc = {GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA};
setBlendFunc(blendFunc);
}
else
{
ccBlendFunc blendFunc = {CC_BLEND_SRC, CC_BLEND_DST};
setBlendFunc(blendFunc);
}
}
}

void YourSprite::draw()

{

CCNode::draw();

CCAssert(! m_bUsesBatchNode, "");

// Default GL states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_TEXTURE_COORD_ARRAY
// Needed states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_TEXTURE_COORD_ARRAY
// Unneeded states: -
bool newBlend = m_sBlendFunc.src != CC_BLEND_SRC || m_sBlendFunc.dst != CC_BLEND_DST;
if (newBlend)
{
glBlendFunc(m_sBlendFunc.src, m_sBlendFunc.dst);
}

#define kQuadSize sizeof(m_sQuad.bl)
if (m_pobTexture)
{
glBindTexture(GL_TEXTURE_2D, m_pobTexture->getName());
}
else
{
glBindTexture(GL_TEXTURE_2D, 0);
}

if (m_hightlight)
{
glActiveTexture( GL_TEXTURE0 );

//the magic
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_ADD); //you can change me... GL_REPLACE, GL_SUBSTRACT produce nice effects
glTexEnvi(GL_TEXTURE_ENV, GL_SRC0_RGB, GL_PREVIOUS); //setColor
glTexEnvi(GL_TEXTURE_ENV, GL_SRC1_RGB, GL_TEXTURE); //your texture
}
long offset = (long)&m_sQuad;

// vertex
int diff = offsetof(ccV3F_C4B_T2F, vertices);
glVertexPointer(3, GL_FLOAT, kQuadSize, (void*)(offset + diff));

// color
diff = offsetof( ccV3F_C4B_T2F, colors);
glColorPointer(4, GL_UNSIGNED_BYTE, kQuadSize, (void*)(offset + diff));

// tex coords
diff = offsetof( ccV3F_C4B_T2F, texCoords);
glTexCoordPointer(2, GL_FLOAT, kQuadSize, (void*)(offset + diff));

glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

if( newBlend )
{
glBlendFunc(CC_BLEND_SRC, CC_BLEND_DST);
}

#if CC_SPRITE_DEBUG_DRAW == 1
// draw bounding box
CCSize s = m_tContentSize;
CCPoint vertices[4] = {
ccp(0,0), ccp(s.width,0),
ccp(s.width,s.height), ccp(0,s.height)
};
ccDrawPoly(vertices, 4, true);
#elif CC_SPRITE_DEBUG_DRAW == 2
// draw texture box
const CCSize& s = m_obRect.size;
const CCPoint& offsetPix = getOffsetPositionInPixels();
CCPoint vertices[4] = {
ccp(offsetPix.x,offsetPix.y), ccp(offsetPix.x+s.width,offsetPix.y),
ccp(offsetPix.x+s.width,offsetPix.y+s.height), ccp(offsetPix.x,offsetPix.y+s.height)
};
ccDrawPoly(vertices, 4, true);
#endif // CC_SPRITE_DEBUG_DRAW

if (m_hightlight)
{
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
}