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glfw/examples/triangle.c
Camilla Berglund 9cc8fc0d0a Removed glfwGetError and glfwErrorString.
The cached error code cannot be made per-thread unless it required
glfwInit (due to lack of __thread on OS X), which would be confusing and
partially defeats the purpose of it.

Beginners would use the generic error string facility instead of the
error callback and then be confused by its nondescript messages.

Storing the provided error code from within the error callback, whether
globally or per-thread, requires just a few lines of code and hands
control to the user without compromising thread safety.
2012-12-30 01:50:03 +01:00

103 lines
2.9 KiB
C

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