//?4分屏
const?static?GLfloat?TEXTURE_COORD[]?=?{
????????2.0f,2.0f,?//?右下
????????2.0f,0.0f,?//?右上
????????0.0f,2.0f,?//?左下
????????0.0f,0.0f?//?左上
};
//?九分屏
const?static?GLfloat?TEXTURE_COORD[]?=?{
????????3.0f,3.0f,?//?右下
????????3.0f,0.0f,?//?右上
????????0.0f,3.0f,?//?左下
????????0.0f,0.0f?//?左上
};

GL_REPEAT?//?對(duì)紋理的默認(rèn)行為。重復(fù)紋理圖像。
GL_MIRRORED_REPEAT?//和GL_REPEAT一樣，但每次重復(fù)圖片是鏡像放置的。
GL_CLAMP_TO_EDGE?//紋理坐標(biāo)會(huì)被約束在0到1之間，超出的部分會(huì)重復(fù)紋理坐標(biāo)的邊緣，產(chǎn)生一種邊緣被拉伸的效果。
GL_CLAMP_TO_BORDER?//超出的坐標(biāo)為用戶指定的邊緣顏色。

glTexParameteri(GL_TEXTURE_2D,?GL_TEXTURE_WRAP_S,?GL_MIRRORED_REPEAT);
glTexParameteri(GL_TEXTURE_2D,?GL_TEXTURE_WRAP_T,?GL_MIRRORED_REPEAT);

glTexParameteri(GL_TEXTURE_2D,?GL_TEXTURE_MIN_FILTER,?GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D,?GL_TEXTURE_MAG_FILTER,?GL_LINEAR);

//?頂點(diǎn)坐標(biāo)，使用繪制兩個(gè)三角形組成一個(gè)矩形的形式(三角形帶)
//?第一第二第三個(gè)點(diǎn)組成一個(gè)三角形，第二第三第四個(gè)點(diǎn)組成一個(gè)三角形
const?static?GLfloat?VERTICES[]?=?{
????????0.5f,-0.5f,?//?右下
????????0.5f,0.5f,?//?右上
????????-0.5f,-0.5f,?//?左下
????????-0.5f,0.5f?//?左上
};
//?紋理坐標(biāo)（原點(diǎn)在左下角，這樣貼圖看到的會(huì)是倒置的
const?static?GLfloat?TEXTURE_COORD[]?=?{
????????1.0f,0.0f,?//?右下
????????1.0f,1.0f,?//?右上
????????0.0f,0.0f,?//?左下
????????0.0f,1.0f?//?左上
};

#include?"TextureMapOpengl.h"
#include?"../utils/Log.h"
//?頂點(diǎn)著色器
static?const?char?*ver?=?"#version?300?es\n"
?????????????????????????"in?vec4?aPosition;\n"
?????????????????????????"in?vec2?aTexCoord;\n"
?????????????????????????"out?vec2?TexCoord;\n"
?????????????????????????"void?main()?{\n"
?????????????????????????"??TexCoord?=?aTexCoord;\n"
?????????????????????????"??gl_Position?=?aPosition;\n"
?????????????????????????"}";
//?片元著色器
static?const?char?*fragment?=?"#version?300?es\n"
??????????????????????????????"precision?mediump?float;\n"
??????????????????????????????"out?vec4?FragColor;\n"
??????????????????????????????"in?vec2?TexCoord;\n"
??????????????????????????????"uniform?sampler2D?ourTexture;\n"
??????????????????????????????"void?main()\n"
??????????????????????????????"{\n"
??????????????????????????????"????FragColor?=?texture(ourTexture,?TexCoord);\n"
??????????????????????????????"}";
//?使用繪制兩個(gè)三角形組成一個(gè)矩形的形式(三角形帶)
//?第一第二第三個(gè)點(diǎn)組成一個(gè)三角形，第二第三第四個(gè)點(diǎn)組成一個(gè)三角形
const?static?GLfloat?VERTICES[]?=?{
????????0.5f,-0.5f,?//?右下
????????0.5f,0.5f,?//?右上
????????-0.5f,-0.5f,?//?左下
????????-0.5f,0.5f?//?左上
};
//?紋理坐標(biāo)（原點(diǎn)在左下角，這樣貼圖看到的會(huì)是倒置的
//const?static?GLfloat?TEXTURE_COORD[]?=?{
//????????1.0f,0.0f,?//?右下
//????????1.0f,1.0f,?//?右上
//????????0.0f,0.0f,?//?左下
//????????0.0f,1.0f?//?左上
//};
//?貼圖紋理坐標(biāo)（參考手機(jī)屏幕坐標(biāo)系統(tǒng)，原點(diǎn)在左上角）
//由于對(duì)一個(gè)OpenGL紋理來說，它沒有內(nèi)在的方向性，因此我們可以使用不同的坐標(biāo)把它定向到任何我們喜歡的方向上，然而大多數(shù)計(jì)算機(jī)圖像都有一個(gè)默認(rèn)的方向，它們通常被規(guī)定為y軸向下，X軸向右
const?static?GLfloat?TEXTURE_COORD[]?=?{
????????1.0f,1.0f,?//?右下
????????1.0f,0.0f,?//?右上
????????0.0f,1.0f,?//?左下
????????0.0f,0.0f?//?左上
};
//?四分屏??GL_REPEAT環(huán)繞方式
//const?static?GLfloat?TEXTURE_COORD[]?=?{
//????????2.0f,2.0f,?//?右下
//????????2.0f,0.0f,?//?右上
//????????0.0f,2.0f,?//?左下
//????????0.0f,0.0f?//?左上
//};
//?九分屏?GL_REPEAT環(huán)繞方式
//const?static?GLfloat?TEXTURE_COORD[]?=?{
//????????3.0f,3.0f,?//?右下
//????????3.0f,0.0f,?//?右上
//????????0.0f,3.0f,?//?左下
//????????0.0f,0.0f?//?左上
//};
TextureMapOpengl::TextureMapOpengl():BaseOpengl()?{
????initGlProgram(ver,fragment);
????positionHandle?=?glGetAttribLocation(program,"aPosition");
????textureHandle?=?glGetAttribLocation(program,"aTexCoord");
????textureSampler?=?glGetUniformLocation(program,"ourTexture");
????LOGD("program:%d",program);
????LOGD("positionHandle:%d",positionHandle);
????LOGD("textureHandle:%d",textureHandle);
????LOGD("textureSample:%d",textureSampler);
}
void?TextureMapOpengl::setPixel(void?*data,?int?width,?int?height,?int?length)?{
????LOGD("texture?setPixel");
????glGenTextures(1,?&textureId);
????//?激活紋理，注意以下這個(gè)兩句是搭配的，glActiveTexture激活的是那個(gè)紋理，就設(shè)置的sampler2D是那個(gè)
????//?默認(rèn)是0，如果不是0的話，需要在onDraw的時(shí)候重新激活一下？
//????glActiveTexture(GL_TEXTURE0);
//????glUniform1i(textureSampler,?0);
//?例如，一樣的
????glActiveTexture(GL_TEXTURE2);
????glUniform1i(textureSampler,?2);
????//?綁定紋理
????glBindTexture(GL_TEXTURE_2D,?textureId);
????//?為當(dāng)前綁定的紋理對(duì)象設(shè)置環(huán)繞、過濾方式
????glTexParameteri(GL_TEXTURE_2D,?GL_TEXTURE_WRAP_S,?GL_REPEAT);
????glTexParameteri(GL_TEXTURE_2D,?GL_TEXTURE_WRAP_T,?GL_REPEAT);
????glTexParameteri(GL_TEXTURE_2D,?GL_TEXTURE_MIN_FILTER,?GL_LINEAR);
????glTexParameteri(GL_TEXTURE_2D,?GL_TEXTURE_MAG_FILTER,?GL_LINEAR);
????glTexImage2D(GL_TEXTURE_2D,?0,?GL_RGBA,?width,?height,?0,?GL_RGBA,?GL_UNSIGNED_BYTE,?data);
????//?生成mip貼圖
????glGenerateMipmap(GL_TEXTURE_2D);
????glBindTexture(GL_TEXTURE_2D,?textureId);
????//?解綁定
????glBindTexture(GL_TEXTURE_2D,?0);
}
void?TextureMapOpengl::onDraw()?{
????glClearColor(0.0f,?1.0f,?0.0f,?1.0f);
????glClear(GL_COLOR_BUFFER_BIT);
????glUseProgram(program);
????//?激活紋理
????glActiveTexture(GL_TEXTURE2);
????glUniform1i(textureSampler,?2);
????//?綁定紋理
????glBindTexture(GL_TEXTURE_2D,?textureId);
????/**
?????*?size?幾個(gè)數(shù)字表示一個(gè)點(diǎn)，顯示是兩個(gè)數(shù)字表示一個(gè)點(diǎn)
?????*?normalized?是否需要?dú)w一化，不用，這里已經(jīng)歸一化了
?????*?stride?步長，連續(xù)頂點(diǎn)之間的間隔，如果頂點(diǎn)直接是連續(xù)的，也可填0
?????*/
????//?啟用頂點(diǎn)數(shù)據(jù)
????glEnableVertexAttribArray(positionHandle);
????glVertexAttribPointer(positionHandle,2,GL_FLOAT,GL_FALSE,0,VERTICES);
????//?紋理坐標(biāo)
????glEnableVertexAttribArray(textureHandle);
????glVertexAttribPointer(textureHandle,2,GL_FLOAT,GL_FALSE,0,TEXTURE_COORD);
????//?4個(gè)頂點(diǎn)繪制兩個(gè)三角形組成矩形
?????glDrawArrays(GL_TRIANGLE_STRIP,0,4);
????glUseProgram(0);
????//?禁用頂點(diǎn)
????glDisableVertexAttribArray(positionHandle);
????if(nullptr?!=?eglHelper){
????????eglHelper->swapBuffers();
????}
????glBindTexture(GL_TEXTURE_2D,?0);
}
TextureMapOpengl::~TextureMapOpengl()?{
????LOGD("TextureMapOpengl析構(gòu)函數(shù)");
}