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This是我以前的问题。Qt GLSL纹理只出现一种颜色
现在我想将我以前的遗留obj加载程序移植到GLSL。
但是，纹理上只有一种颜色可以绑定到obj。
所以，当我渲染obj时，整个obj都是纯色。
#include <QVector>
#include <QTextStream>
#include <QVector3D>
#include <QVector2D>
#include <QOpenGLShaderProgram>
#include <QOpenGLFunctions>
#include <QMatrix4x4>
struct Face{
QVector<QVector3D> v;
QVector<QVector3D> vn;
QVector<QVector2D> t;
Face(){
v.resize(3);
vn.resize(3);
t.resize(3);
}
};
class ModelGLSL
{
public:
ModelGLSL() {}
ModelGLSL(QString filename);
void render(QOpenGLShaderProgram* program, QMatrix4x4 MVPmarix);
QString textureName;
QVector<QVector3D> Faces_vertices;
QVector<QVector2D> Faces_textureCoordinates;
GLuint texture;
private:
QString fileName;
QImage textureImg;
void LoadMTL(QString fn, QString MTLname);
void LoadTexture();
};
#include "ModelGLSL.h"
ModelGLSL::ModelGLSL(QString filename)
{
fileName = filename;
QString texturename;
QVector3D temp3D;
QVector2D temp2D;
QVector<Face> Faces;
QVector<QVector3D> Vertices;
QVector<QVector3D> VNormals;
QVector<QVector2D> UVs;
if(!fileName.isEmpty())
{
QFile file(fileName);
if (file.open(QIODevice::ReadOnly | QIODevice::Text))
{
QTextStream fileText(&file);
while (!fileText.atEnd())
{
QString fileLine = fileText.readLine();
if(fileLine.startsWith("vn "))
{
QStringList lineList = fileLine.split(" ");
temp3D.setX(lineList[1].toFloat());
temp3D.setY(lineList[2].toFloat());
temp3D.setZ(lineList[3].toFloat());
VNormals.push_back(temp3D);
}
else if(fileLine.startsWith("vt "))
{
QStringList lineList = fileLine.split(" ");
temp2D.setX(lineList[1].toFloat());
temp2D.setY(lineList[2].toFloat());
UVs.push_back(temp2D);
}
else if(fileLine.startsWith("v "))
{
QStringList lineList = fileLine.split(" ");
temp3D.setX(lineList[1].toFloat());
temp3D.setY(lineList[2].toFloat());
temp3D.setZ(lineList[3].toFloat());
Vertices.push_back(temp3D);
}
else if(fileLine.startsWith("f "))
{
Face F;
QStringList lineList = fileLine.split(" ");
for(int i = 1; i <= 3; i++)
{
QStringList arg = lineList[i].split("/");
F.v[i-1] = Vertices[arg[0].toInt()-1];
F.t[i-1] = UVs[arg[1].toInt()-1];
F.vn[i-1] = VNormals[arg[2].toInt()-1];
}
Faces.push_back(F);
}
else if(fileLine.startsWith("mtllib "))
{
QStringList lineList = fileLine.split(" ");
texturename = lineList[1];
}
}
LoadMTL(":/Model/Models/", ":/Model/Models/" + texturename);
}
file.close();
}
for(int i = 0; i < Faces.size(); i++)
{
Faces_vertices << Faces[i].v;
Faces_textureCoordinates << Faces[i].t;
}
}
void ModelGLSL::LoadMTL(QString fn, QString MTLname)
{
if(!MTLname.isEmpty())
{
QFile file(MTLname);
if (file.open(QIODevice::ReadOnly | QIODevice::Text))
{
QTextStream fileText(&file);
while (!fileText.atEnd())
{
QString fileLine = fileText.readLine();
if(fileLine.startsWith("map_Kd "))
{
QStringList lineList = fileLine.split(" ");
textureName = fn + lineList[1];
LoadTexture();
}
}
}
file.close();
}
}
void ModelGLSL::LoadTexture()
{
textureImg = QGLWidget::convertToGLFormat(QImage(textureName));
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, textureImg.width(), textureImg.height(), 0, GL_RGBA,
GL_UNSIGNED_BYTE, textureImg.bits());
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glBindTexture(GL_TEXTURE_2D, 0);
}
void ModelGLSL::render(QOpenGLShaderProgram *program, QMatrix4x4 MVPmarix)
{
glEnable(GL_DEPTH_TEST);
glEnable(GL_TEXTURE_2D);
program->setUniformValue("mvpMatrix", MVPmarix);
program->setUniformValue("texture", 0);
glBindTexture(GL_TEXTURE_2D, texture);
program->setAttributeArray("vertex", Faces_vertices.constData());
program->enableAttributeArray("vertex");
program->setAttributeArray("textureCoordinate", Faces_textureCoordinates.constData());
program->enableAttributeArray("textureCoordinate");
glDrawArrays(GL_TRIANGLES, 0, Faces_vertices.size());
program->disableAttributeArray("vertex");
program->disableAttributeArray("textureCoordinate");
program->release();
glDisable(GL_DEPTH_TEST);
glDisable(GL_TEXTURE_2D);
}
在vs.vert
#version 430 core
uniform mat4 mvpMatrix;
in vec4 vertex;
in vec2 textureCoordinate;
out vec2 varyingTextureCoordinate;
void main(void)
{
varyingTextureCoordinate = textureCoordinate;
gl_Position = mvpMatrix * vertex;
}
在fs.frag
#version 430 core
uniform sampler2D texture;
in vec2 varyingTextureCoordinate;
out vec4 fragColor;
void main(void)
{
fragColor = texture2D(texture, varyingTextureCoordinate);
}
（）
initializeOpenGLFunctions();
program = new QOpenGLShaderProgram;
program->addShaderFromSourceFile(QOpenGLShader::Vertex, ":/Shader/Shaders/vs.vert");
program->addShaderFromSourceFile(QOpenGLShader::Fragment, ":/Shader/Shaders/fs.frag");
program->link();
OBJ = new ModelGLSL(":/Model/Models/OBJ.obj");
（）
OBJ->render(program, projection * view * model);