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"Cool" OpenGL Demo of a rectangle

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This commit is contained in:
gingerBill
2016-08-16 23:23:01 +01:00
parent 9e61e3beee
commit f17bc687a3
3 changed files with 94 additions and 21 deletions
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examples/main.odin
+40 -20
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@@ -1,5 +1,6 @@
#load "basic.odin"
#load "win32.odin"
#load "opengl.odin"
win32_perf_count_freq := GetQueryPerformanceFrequency();
@@ -26,10 +27,10 @@ win32_print_last_error :: proc() {
main :: proc() {
instance := GetModuleHandleA(null);
class_name := "Odin-Language-Demo\x00";
title := "Odin Language Demo\x00";
class_name := "Odin-Language-Demo\x00";
title := "Odin Language Demo\x00";
c_class_name := ^class_name[0];
c_title := ^title[0];
c_title := ^title[0];
wc := WNDCLASSEXA{
cbSize = size_of(WNDCLASSEXA) as u32,
@@ -49,10 +50,14 @@ main :: proc() {
return;
}
WINDOW_WIDTH :: 854;
WINDOW_HEIGHT :: 480;
hwnd := CreateWindowExA(0,
c_class_name, c_title,
WS_VISIBLE | WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX,
CW_USEDEFAULT, CW_USEDEFAULT, 854, 480,
CW_USEDEFAULT, CW_USEDEFAULT,
WINDOW_WIDTH, WINDOW_HEIGHT,
null, null, instance, null);
@@ -82,30 +87,25 @@ main :: proc() {
wglMakeCurrent(dc, opengl_context);
attribs := [8]i32{
0x2091, // WGL_CONTEXT_MAJOR_VERSION_ARB
2, // Major
0x2092, // WGL_CONTEXT_MINOR_VERSION_ARB
1, // Minor
0x9126, // WGL_CONTEXT_PROFILE_MASK_ARB
0x0002, // WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB
WGL_CONTEXT_MAJOR_VERSION_ARB, 2,
WGL_CONTEXT_MINOR_VERSION_ARB, 1,
WGL_CONTEXT_PROFILE_MASK_ARB, WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
0, // NOTE(bill): tells the proc that this is the end of attribs
};
wgl_string := "wglCreateContextAttribsARB\x00";
wglCreateContextAttribsARB := wglGetProcAddress(^wgl_string[0]) as wglCreateContextAttribsARBType;
c_wgl_string := ^wgl_string[0];
wglCreateContextAttribsARB := wglGetProcAddress(c_wgl_string) as wglCreateContextAttribsARBType;
rc := wglCreateContextAttribsARB(dc, 0, ^attribs[0]);
wglMakeCurrent(dc, rc);
SwapBuffers(dc);
}
start_time := time_now();
running := false;
running := true;
for running {
curr_time := time_now();
dt := curr_time - start_time;
if dt > 2.0 {
running = false;
}
msg: MSG;
for {
@@ -115,14 +115,34 @@ main :: proc() {
}
if msg.message == WM_QUIT {
return;
} else {
_ = TranslateMessage(^msg);
_ = DispatchMessageA(^msg);
running = false;
break;
}
_ = TranslateMessage(^msg);
_ = DispatchMessageA(^msg);
}
glClearColor(0.5, 0.7, 1.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
// glOrtho(0, WINDOW_WIDTH, 0, WINDOW_HEIGHT, -1, +1);
{
glBegin(GL_TRIANGLES);
defer glEnd();
glColor3f(1, 0, 0); glVertex3f(+0.5, -0.5, 0);
glColor3f(0, 1, 0); glVertex3f(+0.5, +0.5, 0);
glColor3f(0, 0, 1); glVertex3f(-0.5, +0.5, 0);
glColor3f(0, 0, 1); glVertex3f(-0.5, +0.5, 0);
glColor3f(1, 1, 0); glVertex3f(-0.5, -0.5, 0);
glColor3f(1, 0, 0); glVertex3f(+0.5, -0.5, 0);
}
SwapBuffers(dc);
sleep_ms(2);
{
ms := (16 - dt*1000) as i32;
if ms > 0 { sleep_ms(ms); }
}
}
}