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Convert sharing test to GL2

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This commit is contained in:
Camilla Berglund 2016-09-20 14:12:15 +02:00
parent f7584bf14c
commit ca38af0d83
1 changed files with 147 additions and 101 deletions
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248
tests/sharing.c
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@ -33,11 +33,34 @@
#include <stdio.h>
#include <stdlib.h>
#define WIDTH 400
#define HEIGHT 400
#define OFFSET 50
#include "linmath.h"
static GLFWwindow* windows[2];
static const char* vertex_shader_text =
"uniform mat4 MVP;\n"
"attribute vec2 vPos;\n"
"varying vec2 texcoord;\n"
"void main()\n"
"{\n"
" gl_Position = MVP * vec4(vPos, 0.0, 1.0);\n"
" texcoord = vPos;\n"
"}\n";
static const char* fragment_shader_text =
"uniform sampler2D texture;\n"
"uniform vec3 color;\n"
"varying vec2 texcoord;\n"
"void main()\n"
"{\n"
" gl_FragColor = vec4(color * tex2D(texture, texcoord).rgb, 1.0);\n"
"}\n";
static const vec2 vertices[4] =
{
{ 0.f, 0.f },
{ 1.f, 0.f },
{ 1.f, 1.f },
{ 0.f, 1.f }
};
static void error_callback(int error, const char* description)
{
@ -50,132 +73,155 @@ static void key_callback(GLFWwindow* window, int key, int scancode, int action,
glfwSetWindowShouldClose(window, GLFW_TRUE);
}
static GLFWwindow* open_window(const char* title, GLFWwindow* share, int posX, int posY)
{
GLFWwindow* window;
glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);
window = glfwCreateWindow(WIDTH, HEIGHT, title, NULL, share);
if (!window)
return NULL;
glfwMakeContextCurrent(window);
gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
glfwSwapInterval(1);
glfwSetWindowPos(window, posX, posY);
glfwShowWindow(window);
glfwSetKeyCallback(window, key_callback);
return window;
}
static GLuint create_texture(void)
{
int x, y;
char pixels[256 * 256];
GLuint texture;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
for (y = 0; y < 256; y++)
{
for (x = 0; x < 256; x++)
pixels[y * 256 + x] = rand() % 256;
}
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 256, 256, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, pixels);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
return texture;
}
static void draw_quad(GLuint texture)
{
int width, height;
glfwGetFramebufferSize(glfwGetCurrentContext(), &width, &height);
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0.f, 1.f, 0.f, 1.f, 0.f, 1.f);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glBegin(GL_QUADS);
glTexCoord2f(0.f, 0.f);
glVertex2f(0.f, 0.f);
glTexCoord2f(1.f, 0.f);
glVertex2f(1.f, 0.f);
glTexCoord2f(1.f, 1.f);
glVertex2f(1.f, 1.f);
glTexCoord2f(0.f, 1.f);
glVertex2f(0.f, 1.f);
glEnd();
}
int main(int argc, char** argv)
{
int x, y, width;
GLuint texture;
GLFWwindow* windows[2];
GLuint texture, vertex_shader, fragment_shader, program, vertex_buffer;
GLint mvp_location, vpos_location, color_location, texture_location;
glfwSetErrorCallback(error_callback);
if (!glfwInit())
exit(EXIT_FAILURE);
windows[0] = open_window("First", NULL, OFFSET, OFFSET);
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
windows[0] = glfwCreateWindow(400, 400, "First", NULL, NULL);
if (!windows[0])
{
glfwTerminate();
exit(EXIT_FAILURE);
}
// This is the one and only time we create a texture
// It is created inside the first context, created above
// It will then be shared with the second context, created below
texture = create_texture();
glfwSetKeyCallback(windows[0], key_callback);
glfwGetWindowPos(windows[0], &x, &y);
glfwGetWindowSize(windows[0], &width, NULL);
glfwMakeContextCurrent(windows[0]);
// Put the second window to the right of the first one
windows[1] = open_window("Second", windows[0], x + width + OFFSET, y);
// Only enable vsync for the first of the windows to be swapped to
// avoid waiting out the interval for each window
glfwSwapInterval(1);
// The contexts are created with the same APIs so the function
// pointers should be re-usable between them
gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
// Create the OpenGL objects inside the first context, created above
// All objects will be shared with the second context, created below
{
int x, y;
char pixels[256 * 256];
GLuint vertex_shader, fragment_shader;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
for (y = 0; y < 256; y++)
{
for (x = 0; x < 256; x++)
pixels[y * 256 + x] = rand() % 256;
}
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 256, 256, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, pixels);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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");
color_location = glGetUniformLocation(program, "color");
texture_location = glGetUniformLocation(program, "texture");
vpos_location = glGetAttribLocation(program, "vPos");
glGenBuffers(1, &vertex_buffer);
glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
}
glUseProgram(program);
glUniform1i(texture_location, 0);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture);
glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
glEnableVertexAttribArray(vpos_location);
glVertexAttribPointer(vpos_location, 2, GL_FLOAT, GL_FALSE,
sizeof(vertices[0]), (void*) 0);
windows[1] = glfwCreateWindow(400, 400, "Second", NULL, windows[0]);
if (!windows[1])
{
glfwTerminate();
exit(EXIT_FAILURE);
}
// Set drawing color for both contexts
glfwMakeContextCurrent(windows[0]);
glColor3f(0.6f, 0.f, 0.6f);
glfwMakeContextCurrent(windows[1]);
glColor3f(0.6f, 0.6f, 0.f);
// Place the second window to the right of the first
{
int xpos, ypos, left, right, width;
glfwMakeContextCurrent(windows[0]);
glfwGetWindowSize(windows[0], &width, NULL);
glfwGetWindowFrameSize(windows[0], &left, NULL, &right, NULL);
glfwGetWindowPos(windows[0], &xpos, &ypos);
glfwSetWindowPos(windows[1], xpos + width + left + right, ypos);
}
glfwSetKeyCallback(windows[1], key_callback);
glfwMakeContextCurrent(windows[1]);
// While objects are shared, the global context state is not and will
// need to be set up for each context
glUseProgram(program);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture);
glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
glEnableVertexAttribArray(vpos_location);
glVertexAttribPointer(vpos_location, 2, GL_FLOAT, GL_FALSE,
sizeof(vertices[0]), (void*) 0);
while (!glfwWindowShouldClose(windows[0]) &&
!glfwWindowShouldClose(windows[1]))
{
glfwMakeContextCurrent(windows[0]);
draw_quad(texture);
int i;
const vec3 colors[2] =
{
{ 0.6f, 0.6f, 0.f },
{ 0.6f, 0.f, 0.6f }
};
glfwMakeContextCurrent(windows[1]);
draw_quad(texture);
for (i = 0; i < 2; i++)
{
int width, height;
mat4x4 mvp;
glfwSwapBuffers(windows[0]);
glfwSwapBuffers(windows[1]);
glfwGetFramebufferSize(windows[i], &width, &height);
glfwMakeContextCurrent(windows[i]);
glViewport(0, 0, width, height);
mat4x4_ortho(mvp, 0.f, 1.f, 0.f, 1.f, 0.f, 1.f);
glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat*) mvp);
glUniform3fv(color_location, 1, colors[i]);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
glfwSwapBuffers(windows[i]);
}
glfwWaitEvents();
}