#include "c_glrender.h"

void c_glrender::setup_ortho() {
    glPushAttrib(GL_ALL_ATTRIB_BITS);
    glPushMatrix();
    GLint viewport[4];
    glGetIntegerv(GL_VIEWPORT, viewport);
    glViewport(0, 0, viewport[2], viewport[3]);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0, viewport[2], viewport[3], 0, -1, 1);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glDisable(GL_DEPTH_TEST);
}

void c_glrender::restore_gl() {
    glPopMatrix();
    glPopAttrib();
}

void c_glrender::box(GLfloat x, GLfloat y, GLfloat sidelength, GLubyte r,
                     GLubyte g, GLubyte b, GLubyte alpha) {
    // Set our attributes
    glEnable(GL_BLEND);
    glColor4ub(r, g, b, alpha);

    GLfloat halfside = sidelength / 2;

    // Draw our box
    glBegin(GL_QUADS);
    glVertex2d(x + halfside, y + halfside);
    glVertex2d(x + halfside, y - halfside);
    glVertex2d(x - halfside, y - halfside);
    glVertex2d(x - halfside, y + halfside);
    glEnd();
}

void c_glrender::box_outline(GLfloat width, GLfloat x, GLfloat y, GLfloat xLen,
                             GLfloat yLen, GLubyte r, GLubyte g, GLubyte b,
                             GLubyte alpha) {
    // Grab the current line width to prevent clashes
    GLfloat glTemp[1];
    glGetFloatv(GL_LINE_WIDTH, glTemp);

    // Set our attributes
    glEnable(GL_BLEND);
    glColor4ub(r, g, b, alpha);
    glLineWidth(width);

    // Draw out box
    glBegin(GL_LINE_LOOP);
    glVertex2f(x, y);
    glVertex2f(x + xLen, y);
    glVertex2f(x + xLen, y + yLen);
    glVertex2f(x, y + yLen);
    glEnd();

    // Restore the line width
    glLineWidth(glTemp[0]);
}

void c_glrender::line(GLfloat width, GLfloat x1, GLfloat y1, GLfloat x2,
                      GLfloat y2, GLubyte r, GLubyte g, GLubyte b,
                      GLubyte alpha) {
    // Grab the current line width to prevent clashes
    GLfloat glTemp[1];
    glGetFloatv(GL_LINE_WIDTH, glTemp);

    // Set our attributes
    glEnable(GL_BLEND);
    glColor4ub(r, g, b, alpha);
    glLineWidth(width);

    // Draw our line
    glBegin(GL_LINES);
    glVertex2f(x1, y1);
    glVertex2f(x2, y2);
    glEnd();

    // Restore the line width
    glLineWidth(glTemp[0]);
}

void c_glrender::dot(GLfloat size, GLfloat x, GLfloat y, GLubyte r, GLubyte g,
                     GLubyte b, GLubyte alpha) {
    // Grab the current line width to prevent clashes
    GLfloat glTemp[1];
    glGetFloatv(GL_POINT_SIZE, glTemp);

    // Set our attributes
    glEnable(GL_BLEND);
    glColor4ub(r, g, b, alpha);
    glPointSize(size);

    // Draw our point
    glBegin(GL_POINTS);
    glVertex2f(x, y);
    glEnd();

    // Restore to prevent clashing
    glPointSize(glTemp[0]);
}