99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "gl.h"
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#include "glu.h"
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#include "glkos.h"
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/* A general OpenGL initialization function. Sets all of the initial parameters. */
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void InitGL(int Width, int Height) // We call this right after our OpenGL window is created.
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{
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glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // This Will Clear The Background Color To Black
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glClearDepth(1.0); // Enables Clearing Of The Depth Buffer
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glDepthFunc(GL_LEQUAL); // The Type Of Depth Test To Do
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glEnable(GL_DEPTH_TEST); // Enables Depth Testing
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glShadeModel(GL_SMOOTH); // Enables Smooth Color Shading
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glEnable(GL_TEXTURE_2D);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity(); // Reset The Projection Matrix
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gluPerspective(45.0f,(GLfloat)Width/(GLfloat)Height,1.0f,100.0f); // Calculate The Aspect Ratio Of The Window
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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}
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/* The function called when our window is resized (which shouldn't happen, because we're fullscreen) */
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void ReSizeGLScene(int Width, int Height)
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{
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if (Height == 0) // Prevent A Divide By Zero If The Window Is Too Small
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Height = 1;
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glViewport(0, 0, Width, Height); // Reset The Current Viewport And Perspective Transformation
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective(45.0f,(GLfloat)Width/(GLfloat)Height,1.0f,100.0f);
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glMatrixMode(GL_MODELVIEW);
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}
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/* The main drawing function. */
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void DrawGLScene()
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{
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static GLfloat movement = 0.0f;
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static GLboolean increasing = GL_TRUE;
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if(movement > 10.0) {
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increasing = GL_FALSE;
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} else if(movement < -10.0f) {
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increasing = GL_TRUE;
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}
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if(increasing) {
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movement += 0.05f;
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} else {
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movement -= 0.05f;
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}
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer
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glLoadIdentity(); // Reset The View
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glDisable(GL_CULL_FACE);
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glPushMatrix();
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glTranslatef(0.0f, -1.0f, movement);
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glBegin(GL_TRIANGLES);
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glColor3f(1.0f, 0.0f, 0.0f);
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glVertex3f(0.0f, 0.0f, -5.0f);
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glColor3f(1.0f, 0.0f, 0.0f);
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glVertex3f(-2.5f, 0.0f, 5.0f);
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glColor3f(0.0f, 0.0f, 1.0f);
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glVertex3f(2.5f, 0.0f, 5.0f);
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glEnd();
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glPopMatrix();
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// swap buffers to display, since we're double buffered.
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glKosSwapBuffers();
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}
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int main(int argc, char **argv)
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{
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glKosInit();
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InitGL(640, 480);
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ReSizeGLScene(640, 480);
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while(1) {
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DrawGLScene();
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}
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return 0;
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}
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