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mesa/progs/samples/prim.c

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C
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#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);
}
#if 01
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();
#endif
Viewport(2, 1); PolygonFunc();
#if 01
Viewport(2, 2); Quads();
Viewport(2, 3); QuadStrip();
#endif
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;
}
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