Generate PBOs on-the-fly instead of having hard-coded numbers.

[movit] / main.cpp

diff --git a/main.cpp b/main.cpp
index 869371626882eb506cf4cd9f617de4f9c17fb977..7e289935abf29745a4a7a6aee2271097e9d82295 100644 (file)
--- a/main.cpp
+++ b/main.cpp
@@ -177,7 +177,9 @@ int main(int argc, char **argv)
 
        // generate a PDO to hold the data we read back with glReadPixels()
        // (Intel/DRI goes into a slow path if we don't read to PDO)
-       glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, 1);
+       GLuint pbo;
+       glGenBuffers(1, &pbo);
+       glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, pbo);
        glBufferData(GL_PIXEL_PACK_BUFFER_ARB, WIDTH * HEIGHT * 4, NULL, GL_STREAM_READ);
 
        make_hsv_wheel_texture();
@@ -220,7 +222,7 @@ int main(int argc, char **argv)
                input->set_pixel_data(src_img);
                chain.render_to_screen();
                
-               glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, 1);
+               glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, pbo);
                check_error();
                glReadPixels(0, 0, WIDTH, HEIGHT, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, BUFFER_OFFSET(0));
                check_error();
@@ -242,7 +244,7 @@ int main(int argc, char **argv)
                SDL_GL_SwapBuffers();
                check_error();
 
-               glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, 1);
+               glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, pbo);
                check_error();
                unsigned char *screenbuf = (unsigned char *)glMapBuffer(GL_PIXEL_PACK_BUFFER_ARB, GL_READ_ONLY);
                check_error();