247 lines
6.7 KiB
C++
247 lines
6.7 KiB
C++
/*
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* Copyright (c) 2010 Petr Mrázek (peterix)
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* See LICENSE for details.
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*/
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#include "glwidget.h"
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#include <QtOpenGL>
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#include <QGLBuffer>
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#include <QGLShaderProgram>
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#include <QGLPixelBuffer>
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#include <iostream>
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#include <GL/gl.h>
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struct Vertex
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{
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float texcoord[2];
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float color[3];
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float position[3];
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};
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#define FRS 0.0625
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#define FRX FRS/2
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// this is crap
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const Vertex house_vert[] =
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{
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// walls
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{ { 0.0, 0.0 }, { 0.0, 0.0, 1.0 }, { -4.0, -4.0, -4.0 } },
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{ { 0.0, FRS }, { 0.0, 1.0, 0.0 }, { -4.0, -4.0, 4.0 } },
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{ { FRS, FRS }, { 0.0, 1.0, 1.0 }, { 4.0, -4.0, 4.0 } },
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{ { FRS, 0.0 }, { 1.0, 0.0, 0.0 }, { 4.0, -4.0, -4.0 } },
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{ { 0.0, 0.0 }, { 1.0, 0.0, 1.0 }, { -4.0, 4.0, -4.0 } },
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{ { 0.0, FRS }, { 1.0, 1.0, 0.0 }, { -4.0, 4.0, 4.0 } },
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{ { FRS, FRS }, { 1.0, 1.0, 1.0 }, { 4.0, 4.0, 4.0 } },
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{ { FRS, 0.0 }, { 0.0, 0.0, 1.0 }, { 4.0, 4.0, -4.0 } },
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{ { 0.0, 0.0 }, { 0.0, 1.0, 0.0 }, { -4.0, -4.0, -4.0 } },
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{ { 0.0, FRS }, { 0.0, 1.0, 1.0 }, { -4.0, -4.0, 4.0 } },
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{ { FRS, FRS }, { 1.0, 0.0, 0.0 }, { -4.0, 4.0, 4.0 } },
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{ { FRS, 0.0 }, { 1.0, 0.0, 1.0 }, { -4.0, 4.0, -4.0 } },
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{ { 0.0, 0.0 }, { 0.0, 1.0, 0.0 }, { 4.0, -4.0, -4.0 } },
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{ { 0.0, FRS }, { 0.0, 1.0, 1.0 }, { 4.0, -4.0, 4.0 } },
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{ { FRS, FRS }, { 1.0, 0.0, 0.0 }, { 4.0, 4.0, 4.0 } },
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{ { FRS, 0.0 }, { 1.0, 0.0, 1.0 }, { 4.0, 4.0, -4.0 } },
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// roof
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{ { 0.0, 0.0 }, { 0.0, 0.0, 1.0 }, { -4.0, 4.0, -4.0 } },
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{ { FRS, 0.0 }, { 0.0, 1.0, 1.0 }, { 4.0, 4.0, -4.0 } },
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{ { FRX, FRX }, { 1.0, 1.0, 1.0 }, { 0.0, 9.0, 0.0 } },
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{ { FRS, 0.0 }, { 1.0, 0.0, 0.0 }, { 4.0, 4.0, -4.0 } },
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{ { FRS, FRS }, { 1.0, 1.0, 0.0 }, { 4.0, 4.0, 4.0 } },
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{ { FRX, FRX }, { 1.0, 1.0, 1.0 }, { 0.0, 9.0, 0.0 } },
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{ { FRS, FRS }, { 0.0, 1.0, 0.0 }, { 4.0, 4.0, 4.0 } },
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{ { 0.0, FRS }, { 0.0, 1.0, 1.0 }, { -4.0, 4.0, 4.0 } },
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{ { FRX, FRX }, { 1.0, 1.0, 1.0 }, { 0.0, 9.0, 0.0 } },
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{ { 0.0, FRS }, { 0.0, 1.0, 0.0 }, { -4.0, 4.0, 4.0 } },
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{ { 0.0, 0.0 }, { 1.0, 1.0, 0.0 }, { -4.0, 4.0, -4.0 } },
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{ { FRX, FRX }, { 1.0, 1.0, 1.0 }, { 0.0, 9.0, 0.0 } }
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};
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const unsigned char house_idx[] =
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{
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// walls
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0, 1, 2, 0, 2, 3,
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4, 5, 6, 4, 6, 7,
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8, 9, 10, 8, 10, 11,
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12, 13, 14, 12, 14, 15,
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// roof
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16, 17, 18,
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19, 20, 21,
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22, 23, 24,
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25, 26, 27
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};
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class GLWPrivate
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{
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public:
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QGLBuffer *VBO;
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QGLBuffer *EBO;
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QGLShaderProgram prog;
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int positionAttrib;
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int colorAttrib;
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int texcoordsAttrib;
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int mvpUniform;
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int textureUniform;
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int terrain;
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float pz,rx,ry;
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QPoint lastMouse;
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};
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GLWidget::GLWidget()
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{
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d = new GLWPrivate;
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d->pz = -140.0f;
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d->rx = d->ry = 0.0f;
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d->VBO = d->EBO = 0;
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startTimer( 10 );
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}
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GLWidget::~GLWidget()
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{
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if(d->VBO) delete d->VBO;
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if(d->EBO) delete d->EBO;
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delete d;
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}
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const char * VS_src =
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"#version 130\n"
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"in vec3 position; in vec3 color; uniform mat4 mvp; out vec3 c;"
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"in vec2 tc_in; out vec2 coord;"
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"void main()"
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"{"
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"gl_Position = mvp*vec4(position,1);"
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"c = color;"
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"coord = tc_in;"
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"}";
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const char * FS_src =
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"#version 130\n"
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"in vec3 c;"
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//"out vec4 gl_FragColor;"
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"in vec2 coord; uniform sampler2D tex;"
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"void main()"
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"{"
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// "gl_FragColor = vec4(c,1);"
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// "gl_FragColor = mix( texture(tex, coord), vec4(c,1), 0.5);"
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// "gl_FragColor = vec4(c,1) - texture(tex, coord);"
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"gl_FragColor = vec4(c,1) * texture(tex, coord);"
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"}";
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//initialization of OpenGL
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void GLWidget::initializeGL()
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{
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bool test = 1;
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test &= d->prog.addShaderFromSourceCode(QGLShader::Vertex,VS_src);
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test &= d->prog.addShaderFromSourceCode(QGLShader::Fragment,FS_src);
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test &= d->prog.link();
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if(!test)
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std::cout << "OUCH!" << std::endl;
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d->positionAttrib = d->prog.attributeLocation("position");
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d->colorAttrib = d->prog.attributeLocation("color");
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d->texcoordsAttrib = d->prog.attributeLocation("tc_in");
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d->mvpUniform = d->prog.uniformLocation("mvp");
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d->textureUniform = d->prog.uniformLocation("tex");
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if(d->positionAttrib == -1 || d->colorAttrib == -1 || d->mvpUniform == -1)
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std::cout << "Bad attribs!" << std::endl;
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QGLBuffer &VBO = *(d->VBO = new QGLBuffer(QGLBuffer::VertexBuffer));
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VBO.create();
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VBO.bind();
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VBO.allocate(sizeof(house_vert));
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VBO.write(0,house_vert,sizeof(house_vert));
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QGLBuffer &EBO = *(d->EBO = new QGLBuffer(QGLBuffer::IndexBuffer));
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EBO.create();
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EBO.bind();
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EBO.allocate(sizeof(house_idx));
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EBO.write(0,house_idx,sizeof(house_idx));
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QImage texture;
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texture.load("terrain.png");
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d->terrain = bindTexture(texture);
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glClearColor(0.0f, 0.0f, 0.0f, 0.f);
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glShadeModel( GL_SMOOTH );
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glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST );
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glEnable( GL_TEXTURE_2D );
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glEnable( GL_DEPTH_TEST );
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}
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void GLWidget::paintGL()
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{
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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d->prog.bind();
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QMatrix4x4 projection;
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QMatrix4x4 mvp;
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//projection.ortho(-10,10,-10,10,1,1000);
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float aspect = (float)width()/(float)height();
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projection.perspective(10,aspect,1,1000);
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mvp = projection;
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mvp.translate(0,0,d->pz);
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mvp.rotate(d->ry,1,0,0);
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mvp.rotate(d->rx,0,1,0);
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d->prog.setUniformValue(d->mvpUniform,mvp);
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//glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, d->terrain);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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d->prog.setUniformValue(d->textureUniform,0);
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d->prog.enableAttributeArray(d->positionAttrib);
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d->prog.enableAttributeArray(d->colorAttrib);
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d->prog.enableAttributeArray(d->texcoordsAttrib);
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d->VBO->bind();
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d->prog.setAttributeBuffer(d->texcoordsAttrib, GL_FLOAT, offsetof(Vertex, texcoord), 2, sizeof(Vertex));
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d->prog.setAttributeBuffer(d->positionAttrib, GL_FLOAT, offsetof(Vertex, position), 3, sizeof(Vertex));
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d->prog.setAttributeBuffer(d->colorAttrib, GL_FLOAT, offsetof(Vertex, color), 3, sizeof(Vertex));
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d->EBO->bind();
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glDrawElements(GL_TRIANGLES, d->EBO->size(), GL_UNSIGNED_BYTE, NULL);
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d->prog.release();
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}
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void GLWidget::resizeGL(int width, int height)
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{
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glViewport(0, 0, width, height);
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}
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void GLWidget::mousePressEvent(QMouseEvent *event)
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{
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d->lastMouse = event->pos();
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}
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void GLWidget::mouseMoveEvent(QMouseEvent *event)
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{
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int dx = event->x() - d->lastMouse.x();
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int dy = event->y() - d->lastMouse.y();
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if (event->buttons() & Qt::LeftButton)
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{
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d->rx = d->rx + dx;
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d->ry = d->ry + dy;
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}
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d->lastMouse = event->pos();
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}
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void GLWidget::timerEvent(QTimerEvent *event)
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{
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updateGL();
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}
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