#import "CTGLPrimitiveModel.h"

@implementation CTGLPrimitiveModel

#pragma mark - 矩形

void rectangle(long *numVertices, long *numIndices,GLfloat **vVertices,GLfloat **vTextCoord, GLushort **indices)

{

int numVerticesTemp = 4;

int numTextCoordTemp = 4;

int numIndicesTemp = 6;

*numVertices = numVerticesTemp;

*numIndices = numIndicesTemp;

NSLog(@"顶点数-------%zd", numVerticesTemp);

if (vVertices != NULL) {

*vVertices = (GLfloat*) malloc(sizeof(GLfloat) * numVerticesTemp * 3);

}

if (vTextCoord != NULL) {

*vTextCoord = (GLfloat*) malloc(sizeof(GLfloat) * numTextCoordTemp * 2);

}

if (indices != NULL) {

*indices = (GLushort *) malloc(sizeof(GLushort) * numIndicesTemp);

}

(*vVertices)[0] = -1.0;

(*vVertices)[1] = -1.0;

(*vVertices)[2] = 0.0;

(*vVertices)[3] = 1.0;

(*vVertices)[4] = -1.0;

(*vVertices)[5] = 0.0;

(*vVertices)[6] = 1.0;

(*vVertices)[7] = 1.0;

(*vVertices)[8] = 0.0;

(*vVertices)[9] = -1.0;

(*vVertices)[10] = 1.0;

(*vVertices)[11] = 0.0;

(*vTextCoord)[0] = 0.0;

(*vTextCoord)[1] = 1.0;

(*vTextCoord)[2] = 1.0;

(*vTextCoord)[3] = 1.0;

(*vTextCoord)[4] = 1.0;

(*vTextCoord)[5] = 0.0;

(*vTextCoord)[6] = 0.0;

(*vTextCoord)[7] = 0.0;

(*indices)[0] = 0;

(*indices)[1] = 1;

(*indices)[2] = 2;

(*indices)[3] = 2;

(*indices)[4] = 3;

(*indices)[5] = 0;

}

- (instancetype)initWithType:(CT_GLPrimitiveModelType)primitiveModelType

{

self = [super init];

if (self) {

[self updateMatrix4MakeFrustumParameterWithType:primitiveModelType];

}

return self;

}

- (void)updateMatrix4MakeFrustumParameterWithType:(CT_GLPrimitiveModelType)primitiveModelType

{

self.primitiveModelType = primitiveModelType;

}

#pragma mark - Set Get

- (void)setPrimitiveModelType:(CT_GLPrimitiveModelType)primitiveModelType

{

_primitiveModelType = primitiveModelType;

if (_primitiveModelType == CT_GLKVCItemTypeRectangle){

_cam_scale = 2.0;

_near = 1.0;

_far = 4.0;

[self resettingEyePointOrigin];

_centerX = 0;

_centerY = 0;

_centerZ = 0;

_upX = 0;

_upY = 1;

_upZ = 0;

rectangle(&_numVerticesTextCoord, &_numIndices, &_vVertices, &_vTextCoord, &_indices);

}

}

#pragma mark - private Method

- (void)resettingEyePointOrigin

{

if (_primitiveModelType == CT_GLKVCItemTypeRectangle) {

_eyeX = 0;

_eyeY = 0;

_eyeZ = 2;

}

}

- (void)enableItem

{

//Indices

glGenBuffers(1, &_vertexIndicesBufferID);

glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, self.vertexIndicesBufferID);

glBufferData(GL_ELEMENT_ARRAY_BUFFER, self.numIndices*sizeof(GLushort), _indices, GL_STATIC_DRAW);

// Vertex

//

//为缓存提供数据7步骤之 一~五

// 步骤之一: 创建唯一标识符

glGenBuffers(1, &_vertexBufferID);

// 步骤之二: 绑定, 告诉ES 为接下来的运算使用一个缓存

glBindBuffer(GL_ARRAY_BUFFER, self.vertexBufferID);

// 步骤之三: 复制数据到缓存中

glBufferData(GL_ARRAY_BUFFER, _numVerticesTextCoord*3*sizeof(GLfloat), _vVertices, GL_STATIC_DRAW);

// 步骤之四: 启动 启动顶点渲染操作

glEnableVertexAttribArray(GLKVertexAttribPosition);

// 步骤之五: 设置指针,数据大小, 告诉ES数据在哪里, 怎么解释每个顶点保存的数据

glVertexAttribPointer(GLKVertexAttribPosition, 3, GL_FLOAT, GL_FALSE, sizeof(GLfloat)*3, NULL);

// Texture Coordinates

glGenBuffers(1, &_vertexTexCoordID);

glBindBuffer(GL_ARRAY_BUFFER, self.vertexTexCoordID);

glBufferData(GL_ARRAY_BUFFER, _numVerticesTextCoord*2*sizeof(GLfloat), _vTextCoord, GL_DYNAMIC_DRAW);

}

- (void)deleteBuffer

{

glDeleteBuffers (1,

&_vertexBufferID);

_vertexBufferID = 0;

glDeleteBuffers (1,

&_vertexTexCoordID);

_vertexTexCoordID = 0;

glDeleteBuffers (1,

&_vertexIndicesBufferID);

_vertexIndicesBufferID = 0;

}