87 lines
1.8 KiB
C++
87 lines
1.8 KiB
C++
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#include <opengl-playground/textured-rectangle.hpp>
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TexturedRectangle::TexturedRectangle(float x0, float y0, float x1, float y1, OpenGlShaderProgram &shaderprog) :
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OpenGlGraphics(shaderprog)
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{
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this->pos1[0] = x0;
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this->pos1[1] = y0;
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this->pos2[0] = x1;
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this->pos2[1] = y1;
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this->setZoom(1.0f);
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this->setOffset(0.0f, 0.0f);
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this->vao = 0;
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}
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void TexturedRectangle::realize()
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{
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GLuint vbo;
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GLuint elem_buff;
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const unsigned int indices[] = {
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0, 1, 2,
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2, 0, 3
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};
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float vertices[8] = {
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this->pos1[0], this->pos1[1],
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this->pos1[0], this->pos2[1],
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this->pos2[0], this->pos2[1],
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this->pos2[0], this->pos1[1],
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};
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glGenVertexArrays(1, &this->vao);
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glBindVertexArray(this->vao);
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glGenBuffers(1, &vbo);
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glBindBuffer(GL_ARRAY_BUFFER, vbo);
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glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
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glGenBuffers(1, &elem_buff);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elem_buff);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
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glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(float), (void*)0);
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glEnableVertexAttribArray(0);
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}
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void TexturedRectangle::render()
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{
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float offset[2];
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this->shaderprog.use();
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offset[0] = this->getOffsetX();
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offset[1] = this->getOffsetY();
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this->shaderprog.setUniformVec2("pos_offset", offset);
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this->shaderprog.setUniformFloat("zoom", this->zoom);
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glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
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glBindVertexArray(this->vao);
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glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
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}
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void TexturedRectangle::setZoom(float zoom)
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{
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this->zoom = zoom;
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}
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float TexturedRectangle::getZoom()
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{
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return this->zoom;
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}
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void TexturedRectangle::setOffset(float x_off, float y_off)
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{
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this->x_offset = x_off;
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this->y_offset = y_off;
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}
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float TexturedRectangle::getOffsetX()
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{
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return this->x_offset;
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}
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float TexturedRectangle::getOffsetY()
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{
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return this->y_offset;
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}
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