tests/cursor.c - third_party/glfw - Git at Google

 //========================================================================
 // Cursor & input mode tests
 // Copyright (c) Camilla Löwy <elmindreda@glfw.org>
 //
 // This software is provided 'as-is', without any express or implied
 // warranty. In no event will the authors be held liable for any damages
 // arising from the use of this software.
 //
 // Permission is granted to anyone to use this software for any purpose,
 // including commercial applications, and to alter it and redistribute it
 // freely, subject to the following restrictions:
 //
 // 1. The origin of this software must not be misrepresented; you must not
 //    claim that you wrote the original software. If you use this software
 //    in a product, an acknowledgment in the product documentation would
 //    be appreciated but is not required.
 //
 // 2. Altered source versions must be plainly marked as such, and must not
 //    be misrepresented as being the original software.
 //
 // 3. This notice may not be removed or altered from any source
 //    distribution.
 //
 //========================================================================
 //
 // This test provides an interface to the cursor image and cursor mode
 // parts of the API.
 //
 // Custom cursor image generation by urraka.
 //
 //========================================================================

 #include <glad/glad.h>
 #include <GLFW/glfw3.h>

 #if defined(_MSC_VER)
  // Make MS math.h define M_PI
  #define _USE_MATH_DEFINES
 #endif

 #include <math.h>
 #include <stdio.h>
 #include <stdlib.h>

 #include "linmath.h"

 #define CURSOR_FRAME_COUNT 60

 static const char* vertex_shader_text =
 "#version 110\n"
 "uniform mat4 MVP;\n"
 "attribute vec2 vPos;\n"
 "void main()\n"
 "{\n"
 "    gl_Position = MVP * vec4(vPos, 0.0, 1.0);\n"
 "}\n";

 static const char* fragment_shader_text =
 "#version 110\n"
 "void main()\n"
 "{\n"
 "    gl_FragColor = vec4(1.0);\n"
 "}\n";

 static double cursor_x;
 static double cursor_y;
 static int swap_interval = 1;
 static int wait_events = GLFW_TRUE;
 static int animate_cursor = GLFW_FALSE;
 static int track_cursor = GLFW_FALSE;
 static GLFWcursor* standard_cursors[6];

 static void error_callback(int error, const char* description)
 {
     fprintf(stderr, "Error: %s\n", description);
 }

 static float star(int x, int y, float t)
 {
     const float c = 64 / 2.f;

     const float i = (0.25f * (float) sin(2.f * M_PI * t) + 0.75f);
     const float k = 64 * 0.046875f * i;

     const float dist = (float) sqrt((x - c) * (x - c) + (y - c) * (y - c));

     const float salpha = 1.f - dist / c;
     const float xalpha = (float) x == c ? c : k / (float) fabs(x - c);
     const float yalpha = (float) y == c ? c : k / (float) fabs(y - c);

     return (float) fmax(0.f, fmin(1.f, i * salpha * 0.2f + salpha * xalpha * yalpha));
 }

 static GLFWcursor* create_cursor_frame(float t)
 {
     int i = 0, x, y;
     unsigned char buffer[64 * 64 * 4];
     const GLFWimage image = { 64, 64, buffer };

     for (y = 0;  y < image.width;  y++)
     {
         for (x = 0;  x < image.height;  x++)
         {
             buffer[i++] = 255;
             buffer[i++] = 255;
             buffer[i++] = 255;
             buffer[i++] = (unsigned char) (255 * star(x, y, t));
         }
     }

     return glfwCreateCursor(&image, image.width / 2, image.height / 2);
 }

 static void cursor_position_callback(GLFWwindow* window, double x, double y)
 {
     printf("%0.3f: Cursor position: %f %f (%+f %+f)\n",
            glfwGetTime(),
            x, y, x - cursor_x, y - cursor_y);

     cursor_x = x;
     cursor_y = y;
 }

 static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
 {
     if (action != GLFW_PRESS)
         return;

     switch (key)
     {
         case GLFW_KEY_A:
         {
             animate_cursor = !animate_cursor;
             if (!animate_cursor)
                 glfwSetCursor(window, NULL);

             break;
         }

         case GLFW_KEY_ESCAPE:
         {
             if (glfwGetInputMode(window, GLFW_CURSOR) != GLFW_CURSOR_DISABLED)
             {
                 glfwSetWindowShouldClose(window, GLFW_TRUE);
                 break;
             }

             /* FALLTHROUGH */
         }

         case GLFW_KEY_N:
             glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
             printf("(( cursor is normal ))\n");
             break;

         case GLFW_KEY_D:
             glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
             printf("(( cursor is disabled ))\n");
             break;

         case GLFW_KEY_H:
             glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
             printf("(( cursor is hidden ))\n");
             break;

         case GLFW_KEY_SPACE:
             swap_interval = 1 - swap_interval;
             printf("(( swap interval: %i ))\n", swap_interval);
             glfwSwapInterval(swap_interval);
             break;

         case GLFW_KEY_W:
             wait_events = !wait_events;
             printf("(( %sing for events ))\n", wait_events ? "wait" : "poll");
             break;

         case GLFW_KEY_T:
             track_cursor = !track_cursor;
             break;

         case GLFW_KEY_0:
             glfwSetCursor(window, NULL);
             break;

         case GLFW_KEY_1:
             glfwSetCursor(window, standard_cursors[0]);
             break;

         case GLFW_KEY_2:
             glfwSetCursor(window, standard_cursors[1]);
             break;

         case GLFW_KEY_3:
             glfwSetCursor(window, standard_cursors[2]);
             break;

         case GLFW_KEY_4:
             glfwSetCursor(window, standard_cursors[3]);
             break;

         case GLFW_KEY_5:
             glfwSetCursor(window, standard_cursors[4]);
             break;

         case GLFW_KEY_6:
             glfwSetCursor(window, standard_cursors[5]);
             break;
     }
 }

 int main(void)
 {
     int i;
     GLFWwindow* window;
     GLFWcursor* star_cursors[CURSOR_FRAME_COUNT];
     GLFWcursor* current_frame = NULL;
     GLuint vertex_buffer, vertex_shader, fragment_shader, program;
     GLint mvp_location, vpos_location;

     glfwSetErrorCallback(error_callback);

     if (!glfwInit())
         exit(EXIT_FAILURE);

     for (i = 0;  i < CURSOR_FRAME_COUNT;  i++)
     {
         star_cursors[i] = create_cursor_frame(i / (float) CURSOR_FRAME_COUNT);
         if (!star_cursors[i])
         {
             glfwTerminate();
             exit(EXIT_FAILURE);
         }
     }

     for (i = 0;  i < sizeof(standard_cursors) / sizeof(standard_cursors[0]);  i++)
     {
         const int shapes[] = {
             GLFW_ARROW_CURSOR,
             GLFW_IBEAM_CURSOR,
             GLFW_CROSSHAIR_CURSOR,
             GLFW_HAND_CURSOR,
             GLFW_HRESIZE_CURSOR,
             GLFW_VRESIZE_CURSOR
         };

         standard_cursors[i] = glfwCreateStandardCursor(shapes[i]);
         if (!standard_cursors[i])
         {
             glfwTerminate();
             exit(EXIT_FAILURE);
         }
     }

     glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
     glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);

     window = glfwCreateWindow(640, 480, "Cursor Test", NULL, NULL);
     if (!window)
     {
         glfwTerminate();
         exit(EXIT_FAILURE);
     }

     glfwMakeContextCurrent(window);
     gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);

     glGenBuffers(1, &vertex_buffer);
     glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);

     vertex_shader = glCreateShader(GL_VERTEX_SHADER);
     glShaderSource(vertex_shader, 1, &vertex_shader_text, NULL);
     glCompileShader(vertex_shader);

     fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
     glShaderSource(fragment_shader, 1, &fragment_shader_text, NULL);
     glCompileShader(fragment_shader);

     program = glCreateProgram();
     glAttachShader(program, vertex_shader);
     glAttachShader(program, fragment_shader);
     glLinkProgram(program);

     mvp_location = glGetUniformLocation(program, "MVP");
     vpos_location = glGetAttribLocation(program, "vPos");

     glEnableVertexAttribArray(vpos_location);
     glVertexAttribPointer(vpos_location, 2, GL_FLOAT, GL_FALSE,
                           sizeof(vec2), (void*) 0);
     glUseProgram(program);

     glfwGetCursorPos(window, &cursor_x, &cursor_y);
     printf("Cursor position: %f %f\n", cursor_x, cursor_y);

     glfwSetCursorPosCallback(window, cursor_position_callback);
     glfwSetKeyCallback(window, key_callback);

     while (!glfwWindowShouldClose(window))
     {
         glClear(GL_COLOR_BUFFER_BIT);

         if (track_cursor)
         {
             int wnd_width, wnd_height, fb_width, fb_height;
             float scale;
             vec2 vertices[4];
             mat4x4 mvp;

             glfwGetWindowSize(window, &wnd_width, &wnd_height);
             glfwGetFramebufferSize(window, &fb_width, &fb_height);

             glViewport(0, 0, fb_width, fb_height);

             scale = (float) fb_width / (float) wnd_width;
             vertices[0][0] = 0.f;
             vertices[0][1] = (float) (fb_height - cursor_y * scale);
             vertices[1][0] = (float) fb_width;
             vertices[1][1] = (float) (fb_height - cursor_y * scale);
             vertices[2][0] = (float) (cursor_x * scale);
             vertices[2][1] = 0.f;
             vertices[3][0] = (float) (cursor_x * scale);
             vertices[3][1] = (float) fb_height;

             glBufferData(GL_ARRAY_BUFFER,
                          sizeof(vertices),
                          vertices,
                          GL_STREAM_DRAW);

             mat4x4_ortho(mvp, 0.f, (float) fb_width, 0.f, (float) fb_height, 0.f, 1.f);
             glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat*) mvp);

             glDrawArrays(GL_LINES, 0, 4);
         }

         glfwSwapBuffers(window);

         if (animate_cursor)
         {
             const int i = (int) (glfwGetTime() * 30.0) % CURSOR_FRAME_COUNT;
             if (current_frame != star_cursors[i])
             {
                 glfwSetCursor(window, star_cursors[i]);
                 current_frame = star_cursors[i];
             }
         }
         else
             current_frame = NULL;

         if (wait_events)
         {
             if (animate_cursor)
                 glfwWaitEventsTimeout(1.0 / 30.0);
             else
                 glfwWaitEvents();
         }
         else
             glfwPollEvents();

         // Workaround for an issue with msvcrt and mintty
         fflush(stdout);
     }

     glfwDestroyWindow(window);

     for (i = 0;  i < CURSOR_FRAME_COUNT;  i++)
         glfwDestroyCursor(star_cursors[i]);

     for (i = 0;  i < sizeof(standard_cursors) / sizeof(standard_cursors[0]);  i++)
         glfwDestroyCursor(standard_cursors[i]);

     glfwTerminate();
     exit(EXIT_SUCCESS);
 }
	//========================================================================
	// Cursor & input mode tests
	// Copyright (c) Camilla Löwy <elmindreda@glfw.org>
	//
	// This software is provided 'as-is', without any express or implied
	// warranty. In no event will the authors be held liable for any damages
	// arising from the use of this software.
	//
	// Permission is granted to anyone to use this software for any purpose,
	// including commercial applications, and to alter it and redistribute it
	// freely, subject to the following restrictions:
	//
	// 1. The origin of this software must not be misrepresented; you must not
	// claim that you wrote the original software. If you use this software
	// in a product, an acknowledgment in the product documentation would
	// be appreciated but is not required.
	//
	// 2. Altered source versions must be plainly marked as such, and must not
	// be misrepresented as being the original software.
	//
	// 3. This notice may not be removed or altered from any source
	// distribution.
	//
	//========================================================================
	//
	// This test provides an interface to the cursor image and cursor mode
	// parts of the API.
	//
	// Custom cursor image generation by urraka.
	//
	//========================================================================

	#include <glad/glad.h>
	#include <GLFW/glfw3.h>

	#if defined(_MSC_VER)
	// Make MS math.h define M_PI
	#define _USE_MATH_DEFINES
	#endif

	#include <math.h>
	#include <stdio.h>
	#include <stdlib.h>

	#include "linmath.h"

	#define CURSOR_FRAME_COUNT 60

	static const char* vertex_shader_text =
	"#version 110\n"
	"uniform mat4 MVP;\n"
	"attribute vec2 vPos;\n"
	"void main()\n"
	"{\n"
	" gl_Position = MVP * vec4(vPos, 0.0, 1.0);\n"
	"}\n";

	static const char* fragment_shader_text =
	"#version 110\n"
	"void main()\n"
	"{\n"
	" gl_FragColor = vec4(1.0);\n"
	"}\n";

	static double cursor_x;
	static double cursor_y;
	static int swap_interval = 1;
	static int wait_events = GLFW_TRUE;
	static int animate_cursor = GLFW_FALSE;
	static int track_cursor = GLFW_FALSE;
	static GLFWcursor* standard_cursors[6];

	static void error_callback(int error, const char* description)
	{
	fprintf(stderr, "Error: %s\n", description);
	}

	static float star(int x, int y, float t)
	{
	const float c = 64 / 2.f;

	const float i = (0.25f * (float) sin(2.f * M_PI * t) + 0.75f);
	const float k = 64 * 0.046875f * i;

	const float dist = (float) sqrt((x - c) * (x - c) + (y - c) * (y - c));

	const float salpha = 1.f - dist / c;
	const float xalpha = (float) x == c ? c : k / (float) fabs(x - c);
	const float yalpha = (float) y == c ? c : k / (float) fabs(y - c);

	return (float) fmax(0.f, fmin(1.f, i * salpha * 0.2f + salpha * xalpha * yalpha));
	}

	static GLFWcursor* create_cursor_frame(float t)
	{
	int i = 0, x, y;
	unsigned char buffer[64 * 64 * 4];
	const GLFWimage image = { 64, 64, buffer };

	for (y = 0; y < image.width; y++)
	{
	for (x = 0; x < image.height; x++)
	{
	buffer[i++] = 255;
	buffer[i++] = 255;
	buffer[i++] = 255;
	buffer[i++] = (unsigned char) (255 * star(x, y, t));
	}
	}

	return glfwCreateCursor(&image, image.width / 2, image.height / 2);
	}

	static void cursor_position_callback(GLFWwindow* window, double x, double y)
	{
	printf("%0.3f: Cursor position: %f %f (%+f %+f)\n",
	glfwGetTime(),
	x, y, x - cursor_x, y - cursor_y);

	cursor_x = x;
	cursor_y = y;
	}

	static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
	{
	if (action != GLFW_PRESS)
	return;

	switch (key)
	{
	case GLFW_KEY_A:
	{
	animate_cursor = !animate_cursor;
	if (!animate_cursor)
	glfwSetCursor(window, NULL);

	break;
	}

	case GLFW_KEY_ESCAPE:
	{
	if (glfwGetInputMode(window, GLFW_CURSOR) != GLFW_CURSOR_DISABLED)
	{
	glfwSetWindowShouldClose(window, GLFW_TRUE);
	break;
	}

	/* FALLTHROUGH */
	}

	case GLFW_KEY_N:
	glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
	printf("(( cursor is normal ))\n");
	break;

	case GLFW_KEY_D:
	glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
	printf("(( cursor is disabled ))\n");
	break;

	case GLFW_KEY_H:
	glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
	printf("(( cursor is hidden ))\n");
	break;

	case GLFW_KEY_SPACE:
	swap_interval = 1 - swap_interval;
	printf("(( swap interval: %i ))\n", swap_interval);
	glfwSwapInterval(swap_interval);
	break;

	case GLFW_KEY_W:
	wait_events = !wait_events;
	printf("(( %sing for events ))\n", wait_events ? "wait" : "poll");
	break;

	case GLFW_KEY_T:
	track_cursor = !track_cursor;
	break;

	case GLFW_KEY_0:
	glfwSetCursor(window, NULL);
	break;

	case GLFW_KEY_1:
	glfwSetCursor(window, standard_cursors[0]);
	break;

	case GLFW_KEY_2:
	glfwSetCursor(window, standard_cursors[1]);
	break;

	case GLFW_KEY_3:
	glfwSetCursor(window, standard_cursors[2]);
	break;

	case GLFW_KEY_4:
	glfwSetCursor(window, standard_cursors[3]);
	break;

	case GLFW_KEY_5:
	glfwSetCursor(window, standard_cursors[4]);
	break;

	case GLFW_KEY_6:
	glfwSetCursor(window, standard_cursors[5]);
	break;
	}
	}

	int main(void)
	{
	int i;
	GLFWwindow* window;
	GLFWcursor* star_cursors[CURSOR_FRAME_COUNT];
	GLFWcursor* current_frame = NULL;
	GLuint vertex_buffer, vertex_shader, fragment_shader, program;
	GLint mvp_location, vpos_location;

	glfwSetErrorCallback(error_callback);

	if (!glfwInit())
	exit(EXIT_FAILURE);

	for (i = 0; i < CURSOR_FRAME_COUNT; i++)
	{
	star_cursors[i] = create_cursor_frame(i / (float) CURSOR_FRAME_COUNT);
	if (!star_cursors[i])
	{
	glfwTerminate();
	exit(EXIT_FAILURE);
	}
	}

	for (i = 0; i < sizeof(standard_cursors) / sizeof(standard_cursors[0]); i++)
	{
	const int shapes[] = {
	GLFW_ARROW_CURSOR,
	GLFW_IBEAM_CURSOR,
	GLFW_CROSSHAIR_CURSOR,
	GLFW_HAND_CURSOR,
	GLFW_HRESIZE_CURSOR,
	GLFW_VRESIZE_CURSOR
	};

	standard_cursors[i] = glfwCreateStandardCursor(shapes[i]);
	if (!standard_cursors[i])
	{
	glfwTerminate();
	exit(EXIT_FAILURE);
	}
	}

	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);

	window = glfwCreateWindow(640, 480, "Cursor Test", NULL, NULL);
	if (!window)
	{
	glfwTerminate();
	exit(EXIT_FAILURE);
	}

	glfwMakeContextCurrent(window);
	gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);

	glGenBuffers(1, &vertex_buffer);
	glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);

	vertex_shader = glCreateShader(GL_VERTEX_SHADER);
	glShaderSource(vertex_shader, 1, &vertex_shader_text, NULL);
	glCompileShader(vertex_shader);

	fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
	glShaderSource(fragment_shader, 1, &fragment_shader_text, NULL);
	glCompileShader(fragment_shader);

	program = glCreateProgram();
	glAttachShader(program, vertex_shader);
	glAttachShader(program, fragment_shader);
	glLinkProgram(program);

	mvp_location = glGetUniformLocation(program, "MVP");
	vpos_location = glGetAttribLocation(program, "vPos");

	glEnableVertexAttribArray(vpos_location);
	glVertexAttribPointer(vpos_location, 2, GL_FLOAT, GL_FALSE,
	sizeof(vec2), (void*) 0);
	glUseProgram(program);

	glfwGetCursorPos(window, &cursor_x, &cursor_y);
	printf("Cursor position: %f %f\n", cursor_x, cursor_y);

	glfwSetCursorPosCallback(window, cursor_position_callback);
	glfwSetKeyCallback(window, key_callback);

	while (!glfwWindowShouldClose(window))
	{
	glClear(GL_COLOR_BUFFER_BIT);

	if (track_cursor)
	{
	int wnd_width, wnd_height, fb_width, fb_height;
	float scale;
	vec2 vertices[4];
	mat4x4 mvp;

	glfwGetWindowSize(window, &wnd_width, &wnd_height);
	glfwGetFramebufferSize(window, &fb_width, &fb_height);

	glViewport(0, 0, fb_width, fb_height);

	scale = (float) fb_width / (float) wnd_width;
	vertices[0][0] = 0.f;
	vertices[0][1] = (float) (fb_height - cursor_y * scale);
	vertices[1][0] = (float) fb_width;
	vertices[1][1] = (float) (fb_height - cursor_y * scale);
	vertices[2][0] = (float) (cursor_x * scale);
	vertices[2][1] = 0.f;
	vertices[3][0] = (float) (cursor_x * scale);
	vertices[3][1] = (float) fb_height;

	glBufferData(GL_ARRAY_BUFFER,
	sizeof(vertices),
	vertices,
	GL_STREAM_DRAW);

	mat4x4_ortho(mvp, 0.f, (float) fb_width, 0.f, (float) fb_height, 0.f, 1.f);
	glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat*) mvp);

	glDrawArrays(GL_LINES, 0, 4);
	}

	glfwSwapBuffers(window);

	if (animate_cursor)
	{
	const int i = (int) (glfwGetTime() * 30.0) % CURSOR_FRAME_COUNT;
	if (current_frame != star_cursors[i])
	{
	glfwSetCursor(window, star_cursors[i]);
	current_frame = star_cursors[i];
	}
	}
	else
	current_frame = NULL;

	if (wait_events)
	{
	if (animate_cursor)
	glfwWaitEventsTimeout(1.0 / 30.0);
	else
	glfwWaitEvents();
	}
	else
	glfwPollEvents();

	// Workaround for an issue with msvcrt and mintty
	fflush(stdout);
	}

	glfwDestroyWindow(window);

	for (i = 0; i < CURSOR_FRAME_COUNT; i++)
	glfwDestroyCursor(star_cursors[i]);

	for (i = 0; i < sizeof(standard_cursors) / sizeof(standard_cursors[0]); i++)
	glfwDestroyCursor(standard_cursors[i]);

	glfwTerminate();
	exit(EXIT_SUCCESS);
	}