94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
//========================================================================
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// This is a small test application for GLFW.
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// The program opens a window (640x480), and renders a spinning colored
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// triangle (it is controlled with both the GLFW timer and the mouse).
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//========================================================================
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#include <stdio.h>
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#include <stdlib.h>
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#include <GL/glfw3.h>
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int main(void)
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{
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int width, height, x;
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GLFWwindow window;
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// Initialise GLFW
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if (!glfwInit())
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{
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fprintf(stderr, "Failed to initialize GLFW\n");
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exit(EXIT_FAILURE);
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}
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// Open a window and create its OpenGL context
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window = glfwOpenWindow(640, 480, GLFW_WINDOWED, "Spinning Triangle", NULL);
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if (!window)
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{
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fprintf(stderr, "Failed to open GLFW window\n");
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exit(EXIT_FAILURE);
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}
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// Ensure we can capture the escape key being pressed below
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glfwEnable(window, GLFW_STICKY_KEYS);
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// Enable vertical sync (on cards that support it)
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glfwSwapInterval(1);
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do
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{
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double t = glfwGetTime();
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glfwGetMousePos(window, &x, NULL);
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// Get window size (may be different than the requested size)
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glfwGetWindowSize(window, &width, &height);
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// Special case: avoid division by zero below
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height = height > 0 ? height : 1;
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glViewport(0, 0, width, height);
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// Clear color buffer to black
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glClearColor(0.f, 0.f, 0.f, 0.f);
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glClear(GL_COLOR_BUFFER_BIT);
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// Select and setup the projection matrix
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective(65.f, (GLfloat) width / (GLfloat) height, 1.f, 100.f);
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// Select and setup the modelview matrix
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glMatrixMode( GL_MODELVIEW );
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glLoadIdentity();
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gluLookAt(0.f, 1.f, 0.f, // Eye-position
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0.f, 20.f, 0.f, // View-point
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0.f, 0.f, 1.f); // Up-vector
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// Draw a rotating colorful triangle
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glTranslatef(0.f, 14.f, 0.f);
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glRotatef(0.3f * (GLfloat) x + (GLfloat) t * 100.f, 0.f, 0.f, 1.f);
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glBegin(GL_TRIANGLES);
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glColor3f(1.f, 0.f, 0.f);
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glVertex3f(-5.f, 0.f, -4.f);
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glColor3f(0.f, 1.f, 0.f);
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glVertex3f(5.f, 0.f, -4.f);
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glColor3f(0.f, 0.f, 1.f);
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glVertex3f(0.f, 0.f, 6.f);
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glEnd();
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// Swap buffers
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glfwSwapBuffers();
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glfwPollEvents();
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} // Check if the ESC key was pressed or the window was closed
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while (glfwIsWindow(window) &&
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glfwGetKey(window, GLFW_KEY_ESC) != GLFW_PRESS);
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// Close OpenGL window and terminate GLFW
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glfwTerminate();
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exit(EXIT_SUCCESS);
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}
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