a_dinosaur/Lesson10-SDL3
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convert to callback based app

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a dinosaur
2024-03-12 21:49:52 +11:00
parent 0c60210c45
commit e772dc58ca
1 changed files with 25 additions and 53 deletions
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78
Lesson10.c
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@@ -11,6 +11,7 @@
#include <stdlib.h>
#include <stdbool.h>
#include <SDL3/SDL.h>
#define SDL_MAIN_USE_CALLBACKS
#include <SDL3/SDL_main.h>
#include <SDL3/SDL_opengl.h> // Header File For The OpenGL32 Library
@@ -237,7 +238,7 @@ int InitGL(void) // All Setup For OpenGL
return 1; // Initialization Went OK
}
int DrawGLScene(void) // Here's Where We Do All The Drawing
void DrawGLScene(void) // Here's Where We Do All The Drawing
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer
glLoadIdentity(); // Reset The View
@@ -285,7 +286,6 @@ int DrawGLScene(void) // Here's Where We Do A
glTexCoord2f(u_m, v_m); glVertex3f(x_m, y_m, z_m);
glEnd();
}
return 1; // Everything Went OK
}
void KillGLWindow(void) // Properly Kill The Window
@@ -334,9 +334,8 @@ bool CreateGLWindow(char *title, int width, int height, int bits, bool fullscree
if (!(win = SDL_CreateWindow(title,
WindowRect.w, // Window Width
WindowRect.h, // Window Height
SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_HIGH_PIXEL_DENSITY)))
SDL_WINDOW_HIDDEN | SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_HIGH_PIXEL_DENSITY)))
{
KillGLWindow(); // Reset The Display
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "ERROR", "Window Creation Error.", NULL);
return false; // Return FALSE
}
@@ -390,14 +389,12 @@ bool CreateGLWindow(char *title, int width, int height, int bits, bool fullscree
if (!(ctx = SDL_GL_CreateContext(win))) // Are We Able To Get A Rendering Context?
{
KillGLWindow(); // Reset The Display
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "ERROR", "Can't Create A GL Rendering Context.", NULL);
return false; // Return FALSE
}
if (SDL_GL_MakeCurrent(win, ctx)) // Try To Activate The Rendering Context
{
KillGLWindow(); // Reset The Display
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "ERROR", "Can't Activate The GL Rendering Context.", NULL);
return false; // Return FALSE
}
@@ -408,8 +405,6 @@ bool CreateGLWindow(char *title, int width, int height, int bits, bool fullscree
if (!InitGL()) // Initialize Our Newly Created GL Window
{
FreeResources();
KillGLWindow(); // Reset The Display
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "ERROR", "Initialization Failed.", NULL);
return false; // Return FALSE
}
@@ -417,22 +412,17 @@ bool CreateGLWindow(char *title, int width, int height, int bits, bool fullscree
return true; // Success
}
bool done = false; // Bool Variable To Exit Loop
void WndProc(SDL_Event *event)
int SDL_AppEvent(const SDL_Event *event)
{
switch (event->type)
{
case SDL_EVENT_QUIT: // Have we received a quit event?
done = true; // If so done=TRUE
break;
return 1; // Exit with success status
case SDL_EVENT_KEY_DOWN:
if (event->key.keysym.scancode == SDL_SCANCODE_ESCAPE) // Quit on Escape
{
done = true;
break;
return 1; // Exit with success status
}
if (!event->key.repeat) // Was a key just pressed?
{
@@ -450,7 +440,7 @@ void WndProc(SDL_Event *event)
glEnable(GL_BLEND);
glDisable(GL_DEPTH_TEST);
}
break;
return 0;
case SDL_SCANCODE_F: // F = Cycle texture filtering
filter += 1;
@@ -458,37 +448,31 @@ void WndProc(SDL_Event *event)
{
filter = 0;
}
break;
return 0;
case SDL_SCANCODE_F1:
// Toggle Fullscreen / Windowed Mode
fullscreen = !fullscreen;
SDL_SetWindowFullscreen(win, fullscreen);
break;
return 0;
default: break;
default: return 0;
}
}
break;
return 0;
case SDL_EVENT_WINDOW_PIXEL_SIZE_CHANGED: // Resize The OpenGL Window
ReSizeGLScene(event->window.data1, event->window.data2); // data1=Width, data2=Height
break; // Jump Back
return 0;
default: break;
default: return 0;
}
}
int Update(void)
int SDL_AppIterate(void)
{
// Draw The Scene. Watch Quit Messages From DrawGLScene()
if (!DrawGLScene())
{
done = true; // DrawGLScene Signalled A Quit
return 1;
}
SDL_GL_SwapWindow(win); // Swap Buffers (Double Buffering)
DrawGLScene(); // Draw the scene
SDL_GL_SwapWindow(win); // Swap buffers (Double buffering)
// Handle keyboard input
const Uint8* keys = SDL_GetKeyboardState(NULL);
@@ -559,7 +543,7 @@ int Update(void)
return 0;
}
int main(int argc, char *argv[])
int SDL_AppInit(int argc, char *argv[])
{
SDL_Init(SDL_INIT_VIDEO);
@@ -578,33 +562,21 @@ int main(int argc, char *argv[])
SDL_ShowMessageBox(&msgbox, &bttnid);
if (bttnid == 1)
{
fullscreen = false; // Windowed Mode
fullscreen = false; // Windowed Mode
}
// Create Our OpenGL Window
if (!CreateGLWindow("Lionel Brits & NeHe's 3D World Tutorial", 640, 480, 16, fullscreen))
{
return 0; // Quit If Window Was Not Created
return -1; // Quit If Window Was Not Created
}
return 0;
}
do
{
SDL_Event event; // SDL Event Structure
while (SDL_PollEvent(&event) > 0) // Is There A Message Waiting?
{
WndProc(&event); // Deal with events
}
if (Update())
{
done = true;
}
} while (!done);
void SDL_AppQuit()
{
// Shutdown
FreeResources();
KillGLWindow(); // Kill The Window
KillGLWindow(); // Kill The Window
SDL_Quit();
return EXIT_SUCCESS; // Exit The Program
}