纹理效果
//顶点数据，前三个是顶点坐标， 中间三个是顶点颜色， 最后两个是纹理坐标
GLfloat attrArr[] = {
// x, y, z, r, g, b, a, s, t,
-0.5f, 0.5f, 0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f,
0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, 1.0f,
-0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f,
0.5f, -0.5f, 0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f,
};
//顶点索引
GLuint indices[] = {
0, 1, 2,
1, 2, 3,
};
//VBO
GLuint buffer;
glGenBuffers(1, &buffer);
glBindBuffer(GL_ARRAY_BUFFER, buffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(attrArr), attrArr, GL_STATIC_DRAW);
//IBO
GLuint index;
glGenBuffers(1, &index);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, index);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
//坐标
glEnableVertexAttribArray(GLKVertexAttribPosition);
glVertexAttribPointer(GLKVertexAttribPosition, 3, GL_FLOAT, GL_FALSE, sizeof(GLfloat) * 9, (GLfloat *)NULL);
//顶点颜色
glEnableVertexAttribArray(GLKVertexAttribColor);
glVertexAttribPointer(GLKVertexAttribColor, 4, GL_FLOAT, GL_FALSE, sizeof(GLfloat) * 9, (GLfloat *)NULL + 3);
//纹理属性0
glEnableVertexAttribArray(GLKVertexAttribTexCoord0);
glVertexAttribPointer(GLKVertexAttribTexCoord0, 2, GL_FLOAT, GL_FALSE, sizeof(GLfloat) * 9, (GLfloat *)NULL + 3 + 4);
//纹理属性1
glEnableVertexAttribArray(GLKVertexAttribTexCoord1);
glVertexAttribPointer(GLKVertexAttribTexCoord1, 2, GL_FLOAT, GL_FALSE, sizeof(GLfloat) * 9, (GLfloat *)NULL + 3 + 4);
//加载纹理0
NSString* filePath0 = [[NSBundle mainBundle] pathForResource:@"texture0.jpg" ofType:@""];
NSDictionary* options0 = [NSDictionary dictionaryWithObjectsAndKeys:@(1), GLKTextureLoaderGenerateMipmaps, nil];
GLKTextureInfo* textureInfo0 = [GLKTextureLoader textureWithContentsOfFile:filePath0 options:options0 error:nil];
self.mEffect.texture2d0.enabled = GL_TRUE;
self.mEffect.texture2d0.name = textureInfo0.name;
//加载纹理1
NSString* filePath1 = [[NSBundle mainBundle] pathForResource:@"texture1.png" ofType:@""];
NSDictionary* options1 = [NSDictionary dictionaryWithObjectsAndKeys:@(1), GLKTextureLoaderOriginBottomLeft, nil];
GLKTextureInfo* textureInfo1 = [GLKTextureLoader textureWithContentsOfFile:filePath1 options:options1 error:nil];
self.mEffect.texture2d1.enabled = GL_TRUE;
self.mEffect.texture2d1.name = textureInfo1.name;
