#include <stdio.h> #include <string.h> #include <stdlib.h> #include <GL/glut.h> #define PIXEL_CENTER(x) ((long)(x) + 0.5) #define GAP 10 #define ROWS 3 #define COLS 4 #define OPENGL_WIDTH 48 #define OPENGL_HEIGHT 13 GLenum rgb, doubleBuffer, windType; GLint windW, windH; GLenum mode1, mode2; GLint boxW, boxH; GLubyte OpenGL_bits[] = { 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xfb, 0xff, 0xff, 0xff, 0x01, 0x7f, 0xfb, 0xff, 0xff, 0xff, 0x01, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x3e, 0x8f, 0xb7, 0xf9, 0xfc, 0x01, 0x63, 0xdb, 0xb0, 0x8d, 0x0d, 0x00, 0x63, 0xdb, 0xb7, 0x8d, 0x0d, 0x00, 0x63, 0xdb, 0xb6, 0x8d, 0x0d, 0x00, 0x63, 0x8f, 0xf3, 0xcc, 0x0d, 0x00, 0x63, 0x00, 0x00, 0x0c, 0x4c, 0x0a, 0x63, 0x00, 0x00, 0x0c, 0x4c, 0x0e, 0x63, 0x00, 0x00, 0x8c, 0xed, 0x0e, 0x3e, 0x00, 0x00, 0xf8, 0x0c, 0x00, }; #include "tkmap.c" static void Init(void) { mode1 = GL_TRUE; mode2 = GL_TRUE; } static void Reshape(int width, int height) { windW = (GLint)width; windH = (GLint)height; } static void RotateColorMask(void) { static GLint rotation = 0; rotation = (rotation + 1) & 0x3; switch (rotation) { case 0: glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); glIndexMask( 0xff ); break; case 1: glColorMask(GL_FALSE, GL_TRUE, GL_TRUE, GL_TRUE); glIndexMask(0xFE); break; case 2: glColorMask(GL_TRUE, GL_FALSE, GL_TRUE, GL_TRUE); glIndexMask(0xFD); break; case 3: glColorMask(GL_TRUE, GL_TRUE, GL_FALSE, GL_TRUE); glIndexMask(0xFB); break; } } static void Key(unsigned char key, int x, int y) { switch (key) { case 27: exit(1); case '1': mode1 = !mode1; break; case '2': mode2 = !mode2; break; case '3': RotateColorMask(); break; default: return; } glutPostRedisplay(); } static void Viewport(GLint row, GLint column) { GLint x, y; boxW = (windW - (COLS + 1) * GAP) / COLS; boxH = (windH - (ROWS + 1) * GAP) / ROWS; x = GAP + column * (boxW + GAP); y = GAP + row * (boxH + GAP); glViewport(x, y, boxW, boxH); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(-boxW/2, boxW/2, -boxH/2, boxH/2, 0.0, 1.0); glMatrixMode(GL_MODELVIEW); glEnable(GL_SCISSOR_TEST); glScissor(x, y, boxW, boxH); } static void Point(void) { GLint i; glBegin(GL_POINTS); SetColor(COLOR_WHITE); glVertex2i(0, 0); for (i = 1; i < 8; i++) { GLint j = i * 2; SetColor(COLOR_BLACK+i); glVertex2i(-j, -j); glVertex2i(-j, 0); glVertex2i(-j, j); glVertex2i(0, j); glVertex2i(j, j); glVertex2i(j, 0); glVertex2i(j, -j); glVertex2i(0, -j); } glEnd(); } static void Lines(void) { GLint i; glPushMatrix(); glTranslatef(-12, 0, 0); for (i = 1; i < 8; i++) { SetColor(COLOR_BLACK+i); glBegin(GL_LINES); glVertex2i(-boxW/4, -boxH/4); glVertex2i(boxW/4, boxH/4); glEnd(); glTranslatef(4, 0, 0); } glPopMatrix(); glBegin(GL_LINES); glVertex2i(0, 0); glEnd(); } static void LineStrip(void) { glBegin(GL_LINE_STRIP); SetColor(COLOR_RED); glVertex2f(PIXEL_CENTER(-boxW/4), PIXEL_CENTER(-boxH/4)); SetColor(COLOR_GREEN); glVertex2f(PIXEL_CENTER(-boxW/4), PIXEL_CENTER(boxH/4)); SetColor(COLOR_BLUE); glVertex2f(PIXEL_CENTER(boxW/4), PIXEL_CENTER(boxH/4)); SetColor(COLOR_WHITE); glVertex2f(PIXEL_CENTER(boxW/4), PIXEL_CENTER(-boxH/4)); glEnd(); glBegin(GL_LINE_STRIP); glVertex2i(0, 0); glEnd(); } static void LineLoop(void) { glBegin(GL_LINE_LOOP); SetColor(COLOR_RED); glVertex2f(PIXEL_CENTER(-boxW/4), PIXEL_CENTER(-boxH/4)); SetColor(COLOR_GREEN); glVertex2f(PIXEL_CENTER(-boxW/4), PIXEL_CENTER(boxH/4)); SetColor(COLOR_BLUE); glVertex2f(PIXEL_CENTER(boxW/4), PIXEL_CENTER(boxH/4)); SetColor(COLOR_WHITE); glVertex2f(PIXEL_CENTER(boxW/4), PIXEL_CENTER(-boxH/4)); glEnd(); glEnable(GL_LOGIC_OP); glLogicOp(GL_XOR); glEnable(GL_BLEND); glBlendFunc(GL_ONE, GL_ONE); SetColor(COLOR_MAGENTA); glBegin(GL_LINE_LOOP); glVertex2f(PIXEL_CENTER(-boxW/8), PIXEL_CENTER(-boxH/8)); glVertex2f(PIXEL_CENTER(-boxW/8), PIXEL_CENTER(boxH/8)); glEnd(); glBegin(GL_LINE_LOOP); glVertex2f(PIXEL_CENTER(-boxW/8), PIXEL_CENTER(boxH/8+5)); glVertex2f(PIXEL_CENTER(boxW/8), PIXEL_CENTER(boxH/8+5)); glEnd(); glDisable(GL_LOGIC_OP); glDisable(GL_BLEND); SetColor(COLOR_GREEN); glBegin(GL_POINTS); glVertex2i(0, 0); glEnd(); glBegin(GL_LINE_LOOP); glVertex2i(0, 0); glEnd(); } static void Bitmap(void) { glBegin(GL_LINES); SetColor(COLOR_GREEN); glVertex2i(-boxW/2, 0); glVertex2i(boxW/2, 0); glVertex2i(0, -boxH/2); glVertex2i(0, boxH/2); SetColor(COLOR_RED); glVertex2i(0, -3); glVertex2i(0, -3+OPENGL_HEIGHT); SetColor(COLOR_BLUE); glVertex2i(0, -3); glVertex2i(OPENGL_WIDTH, -3); glEnd(); SetColor(COLOR_GREEN); glPixelStorei(GL_UNPACK_LSB_FIRST, GL_TRUE); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); glRasterPos2i(0, 0); glBitmap(OPENGL_WIDTH, OPENGL_HEIGHT, 0, 3, 0.0, 0.0, OpenGL_bits); } static void Triangles(void) { glBegin(GL_TRIANGLES); SetColor(COLOR_GREEN); glVertex2i(-boxW/4, -boxH/4); SetColor(COLOR_RED); glVertex2i(-boxW/8, -boxH/16); SetColor(COLOR_BLUE); glVertex2i(boxW/8, -boxH/16); SetColor(COLOR_GREEN); glVertex2i(-boxW/4, boxH/4); SetColor(COLOR_RED); glVertex2i(-boxW/8, boxH/16); SetColor(COLOR_BLUE); glVertex2i(boxW/8, boxH/16); glEnd(); glBegin(GL_TRIANGLES); glVertex2i(0, 0); glVertex2i(-100, 100); glEnd(); } static void TriangleStrip(void) { glBegin(GL_TRIANGLE_STRIP); SetColor(COLOR_GREEN); glVertex2i(-boxW/4, -boxH/4); SetColor(COLOR_RED); glVertex2i(-boxW/4, boxH/4); SetColor(COLOR_BLUE); glVertex2i(0, -boxH/4); SetColor(COLOR_WHITE); glVertex2i(0, boxH/4); SetColor(COLOR_CYAN); glVertex2i(boxW/4, -boxH/4); SetColor(COLOR_YELLOW); glVertex2i(boxW/4, boxH/4); glEnd(); glBegin(GL_TRIANGLE_STRIP); glVertex2i(0, 0); glVertex2i(-100, 100); glEnd(); } static void TriangleFan(void) { GLint vx[8][2]; GLint x0, y0, x1, y1, x2, y2, x3, y3; GLint i; y0 = -boxH/4; y1 = y0 + boxH/2/3; y2 = y1 + boxH/2/3; y3 = boxH/4; x0 = -boxW/4; x1 = x0 + boxW/2/3; x2 = x1 + boxW/2/3; x3 = boxW/4; vx[0][0] = x0; vx[0][1] = y1; vx[1][0] = x0; vx[1][1] = y2; vx[2][0] = x1; vx[2][1] = y3; vx[3][0] = x2; vx[3][1] = y3; vx[4][0] = x3; vx[4][1] = y2; vx[5][0] = x3; vx[5][1] = y1; vx[6][0] = x2; vx[6][1] = y0; vx[7][0] = x1; vx[7][1] = y0; glBegin(GL_TRIANGLE_FAN); SetColor(COLOR_WHITE); glVertex2i(0, 0); for (i = 0; i < 8; i++) { SetColor(COLOR_WHITE-i); glVertex2iv(vx[i]); } glEnd(); glBegin(GL_TRIANGLE_FAN); glVertex2i(0, 0); glVertex2i(-100, 100); glEnd(); } static void Rect(void) { SetColor(COLOR_GREEN); glRecti(-boxW/4, -boxH/4, boxW/4, boxH/4); } static void PolygonFunc(void) { GLint vx[8][2]; GLint x0, y0, x1, y1, x2, y2, x3, y3; GLint i; y0 = -boxH/4; y1 = y0 + boxH/2/3; y2 = y1 + boxH/2/3; y3 = boxH/4; x0 = -boxW/4; x1 = x0 + boxW/2/3; x2 = x1 + boxW/2/3; x3 = boxW/4; vx[0][0] = x0; vx[0][1] = y1; vx[1][0] = x0; vx[1][1] = y2; vx[2][0] = x1; vx[2][1] = y3; vx[3][0] = x2; vx[3][1] = y3; vx[4][0] = x3; vx[4][1] = y2; vx[5][0] = x3; vx[5][1] = y1; vx[6][0] = x2; vx[6][1] = y0; vx[7][0] = x1; vx[7][1] = y0; glBegin(GL_POLYGON); for (i = 0; i < 8; i++) { SetColor(COLOR_WHITE-i); glVertex2iv(vx[i]); } glEnd(); glBegin(GL_POLYGON); glVertex2i(0, 0); glVertex2i(100, 100); glEnd(); } static void Quads(void) { glBegin(GL_QUADS); SetColor(COLOR_GREEN); glVertex2i(-boxW/4, -boxH/4); SetColor(COLOR_RED); glVertex2i(-boxW/8, -boxH/16); SetColor(COLOR_BLUE); glVertex2i(boxW/8, -boxH/16); SetColor(COLOR_WHITE); glVertex2i(boxW/4, -boxH/4); SetColor(COLOR_GREEN); glVertex2i(-boxW/4, boxH/4); SetColor(COLOR_RED); glVertex2i(-boxW/8, boxH/16); SetColor(COLOR_BLUE); glVertex2i(boxW/8, boxH/16); SetColor(COLOR_WHITE); glVertex2i(boxW/4, boxH/4); glEnd(); glBegin(GL_QUADS); glVertex2i(0, 0); glVertex2i(100, 100); glVertex2i(-100, 100); glEnd(); } static void QuadStrip(void) { glBegin(GL_QUAD_STRIP); SetColor(COLOR_GREEN); glVertex2i(-boxW/4, -boxH/4); SetColor(COLOR_RED); glVertex2i(-boxW/4, boxH/4); SetColor(COLOR_BLUE); glVertex2i(0, -boxH/4); SetColor(COLOR_WHITE); glVertex2i(0, boxH/4); SetColor(COLOR_CYAN); glVertex2i(boxW/4, -boxH/4); SetColor(COLOR_YELLOW); glVertex2i(boxW/4, boxH/4); glEnd(); glBegin(GL_QUAD_STRIP); glVertex2i(0, 0); glVertex2i(100, 100); glVertex2i(-100, 100); glEnd(); } static void Draw(void) { glViewport(0, 0, windW, windH); glDisable(GL_SCISSOR_TEST); glPushAttrib(GL_COLOR_BUFFER_BIT); glColorMask(1, 1, 1, 1); glIndexMask(~0); glClearColor(0.0, 0.0, 0.0, 0.0); glClear(GL_COLOR_BUFFER_BIT); glPopAttrib(); if (mode1) { glShadeModel(GL_SMOOTH); } else { glShadeModel(GL_FLAT); } if (mode2) { glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); } else { glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); } Viewport(0, 0); Point(); Viewport(0, 1); Lines(); Viewport(0, 2); LineStrip(); Viewport(0, 3); LineLoop(); Viewport(1, 0); Bitmap(); Viewport(1, 1); TriangleFan(); Viewport(1, 2); Triangles(); Viewport(1, 3); TriangleStrip(); Viewport(2, 0); Rect(); Viewport(2, 1); PolygonFunc(); Viewport(2, 2); Quads(); Viewport(2, 3); QuadStrip(); glFlush(); if (doubleBuffer) { glutSwapBuffers(); } } static GLenum Args(int argc, char **argv) { GLint i; rgb = GL_TRUE; doubleBuffer = GL_FALSE; for (i = 1; i < argc; i++) { if (strcmp(argv[i], "-ci") == 0) { rgb = GL_FALSE; } else if (strcmp(argv[i], "-rgb") == 0) { rgb = GL_TRUE; } else if (strcmp(argv[i], "-sb") == 0) { doubleBuffer = GL_FALSE; } else if (strcmp(argv[i], "-db") == 0) { doubleBuffer = GL_TRUE; } else { printf("%s (Bad option).\n", argv[i]); return GL_FALSE; } } return GL_TRUE; } int main(int argc, char **argv) { glutInit(&argc, argv); if (Args(argc, argv) == GL_FALSE) { exit(1); } windW = 600; windH = 300; glutInitWindowPosition(0, 0); glutInitWindowSize( windW, windH); windType = (rgb) ? GLUT_RGB : GLUT_INDEX; windType |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE; glutInitDisplayMode(windType); if (glutCreateWindow("Primitive Test") == GL_FALSE) { exit(1); } InitMap(); Init(); glutReshapeFunc(Reshape); glutKeyboardFunc(Key); glutDisplayFunc(Draw); glutMainLoop(); return 0; }