josh/sdl-opengl-glcxx-glm
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

redraw on a timer; rotate quad

Browse Source
This commit is contained in:
Josh Holtrop 2015-10-13 21:38:24 -04:00
parent 9be9f3fc69
commit 17edc0a9d6
1 changed files with 28 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
app.cc
View File

@ -67,7 +67,6 @@ bool init(void)
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (void *)(3 * sizeof(GLfloat)));
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (void *)(6 * sizeof(GLfloat)));
modelview = glm::translate(glm::mat4(1.0), glm::vec3(0, 0, -2));
projection = glm::perspective(60.0f, (float)WIDTH / (float)HEIGHT, 0.1f, 1000.0f);
for (int i = 0; i < 16; i++)
@ -106,12 +105,13 @@ bool init(void)
return true;
}
void display(SDL_Window * window)
static void draw_cube()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glm::mat4 modelview_backup = modelview;
program->use();
cube_array->bind();
glUniform4f(uniforms.ambient, 1.0, 1.0, 1.0, 1.0);
glUniform4f(uniforms.specular, 1.0, 1.0, 1.0, 1.0);
glUniform1f(uniforms.shininess, 150.0);
@ -119,13 +119,30 @@ void display(SDL_Window * window)
glUniformMatrix4fv(uniforms.modelview, 1, GL_FALSE, &modelview[0][0]);
glUniformMatrix4fv(uniforms.projection, 1, GL_FALSE, &projection[0][0]);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
}
void display(SDL_Window * window)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
modelview = glm::translate(glm::mat4(1.0), glm::vec3(0, 0, -2));
modelview = glm::rotate(modelview, (float)(SDL_GetTicks() / 1000.0), glm::vec3(0, 1, 0));
draw_cube();
SDL_GL_SwapWindow(window);
}
static SDL_Event UpdateEvent;
static Uint32 UpdateCallback(Uint32 interval, void * param)
{
SDL_PushEvent(&UpdateEvent);
return interval;
}
int main(int argc, char *argv[])
{
if (SDL_Init(SDL_INIT_VIDEO))
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER))
{
printf("Failed to initialize SDL!\n");
return 1;
@ -164,6 +181,9 @@ int main(int argc, char *argv[])
return 2;
}
UpdateEvent.type = SDL_USEREVENT;
UpdateEvent.user.code = 0;
SDL_AddTimer(25, UpdateCallback, NULL);
display(window);
SDL_Event event;
while (SDL_WaitEvent(&event))
@ -177,5 +197,9 @@ int main(int argc, char *argv[])
if (event.key.keysym.sym == SDLK_RETURN)
display(window);
}
else if (event.type == SDL_USEREVENT)
{
display(window);
}
}
}