a_dinosaur/Lesson10-SDL3
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correctness pass

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a dinosaur
2024-03-12 20:45:35 +11:00
parent 9ea9665e70
commit bfa90f838d
1 changed files with 57 additions and 47 deletions
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104
Lesson10.c
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@@ -14,15 +14,15 @@
#include <SDL3/SDL_main.h>
#include <SDL3/SDL_opengl.h> // Header File For The OpenGL32 Library
SDL_Window* hWnd = NULL; // Holds Our Window Handle
SDL_GLContext hRC = NULL; // Permanent Rendering Context
SDL_Window* win = NULL; // Holds Our Window Handle
SDL_GLContext ctx = NULL; // Permanent Rendering Context
bool keys[SDL_NUM_SCANCODES]; // Array Used For The Keyboard Routine
bool active = true; // Window Active Flag Set To TRUE By Default
bool fullscreen = true; // Fullscreen Flag Set To Fullscreen Mode By Default
bool blend; // Blending ON/OFF
bool bp; // B Pressed?
bool fp; // F Pressed?
bool blend = false; // Blending ON/OFF
bool bpressed = false; // B Pressed?
bool fpressed = false; // F Pressed?
static const SDL_MessageBoxButtonData yesnobttns[2] =
{
@@ -40,17 +40,17 @@ static const SDL_MessageBoxButtonData yesnobttns[2] =
const float piover180 = 0.0174532925f;
float heading;
float xpos;
float zpos;
float xpos, zpos;
GLfloat yrot; // Y Rotation
GLfloat walkbias = 0;
GLfloat walkbiasangle = 0;
GLfloat walkbias = 0.0f;
GLfloat walkbiasangle = 0.0f;
GLfloat lookupdown = 0.0f;
GLfloat z = 0.0f; // Depth Into The Screen
GLuint filter; // Which Filter To Use
GLuint texture[3]; // Storage For 3 Textures
// Storage For 3 Textures
GLuint texture[3] = { 0, 0, 0};
typedef struct tagVERTEX
{
@@ -69,7 +69,8 @@ typedef struct tagSECTOR
TRIANGLE* triangle;
} SECTOR;
SECTOR sector1; // Our Model Goes Here:
// Our Model Goes Here:
SECTOR sector1 = { .numtriangles = 0, .triangle = NULL };
void readstr(FILE *f, char *string)
{
@@ -80,13 +81,13 @@ void readstr(FILE *f, char *string)
return;
}
void SetupWorld()
void SetupWorld(void)
{
float x, y, z, u, v;
int numtriangles;
FILE *filein;
char oneline[255];
filein = fopen("data/world.txt", "rt"); // File To Load World Data From
filein = fopen("data/world.txt", "r"); // File To Load World Data From
readstr(filein, oneline);
sscanf(oneline, "NUMPOLLIES %d\n", &numtriangles);
@@ -140,7 +141,7 @@ bool FlipSurface(SDL_Surface *surface)
return true;
}
int LoadGLTextures() // Load Bitmaps And Convert To Textures
int LoadGLTextures(void) // Load Bitmaps And Convert To Textures
{
int Status = SDL_FALSE; // Status Indicator
@@ -177,6 +178,12 @@ int LoadGLTextures() // Load Bitmaps And Convert To Textures
return Status; // Return The Status
}
void FreeResources(void)
{
free(sector1.triangle);
glDeleteTextures(3, texture);
}
static void gluPerspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar)
{
double h = 1.0 / tan(fovy * (SDL_PI_D / 180.0) * 0.5);
@@ -194,7 +201,7 @@ static void gluPerspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdou
glLoadMatrixd(mtx);
}
GLvoid ReSizeGLScene(GLsizei width, GLsizei height) // Resize And Initialize The GL Window
void ReSizeGLScene(GLsizei width, GLsizei height) // Resize And Initialize The GL Window
{
if (height == 0) // Prevent A Divide By Zero By
{
@@ -213,7 +220,7 @@ GLvoid ReSizeGLScene(GLsizei width, GLsizei height) // Resize And Initializ
glLoadIdentity(); // Reset The Modelview Matrix
}
int InitGL() // All Setup For OpenGL Goes Here
int InitGL(void) // All Setup For OpenGL Goes Here
{
if (!LoadGLTextures()) // Jump To Texture Loading Routine
{
@@ -234,7 +241,7 @@ int InitGL() // All Setup For OpenGL
return 1; // Initialization Went OK
}
int DrawGLScene() // Here's Where We Do All The Drawing
int 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
@@ -249,12 +256,12 @@ int DrawGLScene() // Here's Where We Do A
glRotatef(lookupdown, 1.0f, 0.0f, 0.0f);
glRotatef(sceneroty, 0.0f, 1.0f, 0.0f);
glTranslatef(xtrans, ytrans, ztrans);
glBindTexture(GL_TEXTURE_2D, texture[filter]);
numtriangles = sector1.numtriangles;
// Process Each Triangle
for (int loop_m = 0; loop_m < numtriangles; loop_m++)
{
@@ -266,14 +273,14 @@ int DrawGLScene() // Here's Where We Do A
u_m = sector1.triangle[loop_m].vertex[0].u;
v_m = sector1.triangle[loop_m].vertex[0].v;
glTexCoord2f(u_m, v_m); glVertex3f(x_m, y_m, z_m);
x_m = sector1.triangle[loop_m].vertex[1].x;
y_m = sector1.triangle[loop_m].vertex[1].y;
z_m = sector1.triangle[loop_m].vertex[1].z;
u_m = sector1.triangle[loop_m].vertex[1].u;
v_m = sector1.triangle[loop_m].vertex[1].v;
glTexCoord2f(u_m, v_m); glVertex3f(x_m, y_m, z_m);
x_m = sector1.triangle[loop_m].vertex[2].x;
y_m = sector1.triangle[loop_m].vertex[2].y;
z_m = sector1.triangle[loop_m].vertex[2].z;
@@ -285,27 +292,27 @@ int DrawGLScene() // Here's Where We Do A
return 1; // Everything Went OK
}
GLvoid KillGLWindow() // Properly Kill The Window
void KillGLWindow(void) // Properly Kill The Window
{
if (fullscreen) // Are We In Fullscreen Mode?
{
SDL_SetWindowFullscreen(hWnd, 0); // If So Switch Back To The Desktop
SDL_SetWindowFullscreen(win, 0); // If So Switch Back To The Desktop
SDL_ShowCursor(); // Show Mouse Pointer
}
if (hRC) // Do We Have A Rendering Context?
if (ctx) // Do We Have A Rendering Context?
{
if (SDL_GL_MakeCurrent(hWnd, NULL)) // Are We Able To Release The DC And RC Contexts?
if (SDL_GL_MakeCurrent(win, NULL)) // Are We Able To Release The DC And RC Contexts?
{
SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_INFORMATION, "SHUTDOWN ERROR", "Release Of RC Failed.", NULL);
}
SDL_GL_DeleteContext(hRC); // Delete The RC
hRC = NULL; // Set RC To NULL
SDL_GL_DeleteContext(ctx); // Delete The RC
ctx = NULL; // Set RC To NULL
}
SDL_DestroyWindow(hWnd); // Destroy The Window
hWnd = NULL; // Set hWnd To NULL
SDL_DestroyWindow(win); // Destroy The Window
win = NULL; // Set hWnd To NULL
}
@@ -317,7 +324,7 @@ GLvoid KillGLWindow() // Properly Kill The Window
* fullscreenflag - Use Fullscreen Mode (TRUE) Or Windowed Mode (FALSE) */
bool CreateGLWindow(char* title, int width, int height, int bits, bool fullscreenflag)
bool CreateGLWindow(char *title, int width, int height, int bits, bool fullscreenflag)
{
SDL_Rect WindowRect; // Grabs Rectangle Upper Left / Lower Right Values
WindowRect.x = 0; // Set Left Value To 0
@@ -328,7 +335,7 @@ bool CreateGLWindow(char* title, int width, int height, int bits, bool fullscree
fullscreen = fullscreenflag; // Set The Global Fullscreen Flag
// Create The Window
if (!(hWnd = SDL_CreateWindow(title,
if (!(win = SDL_CreateWindow(title,
WindowRect.w, // Window Width
WindowRect.h, // Window Height
SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_HIGH_PIXEL_DENSITY)))
@@ -340,13 +347,13 @@ bool CreateGLWindow(char* title, int width, int height, int bits, bool fullscree
if (fullscreen) // Attempt Fullscreen Mode?
{
if (SDL_SetWindowFullscreen(hWnd, SDL_TRUE) < 0) // Try To Set Selected Mode And Get Results.
if (SDL_SetWindowFullscreen(win, SDL_TRUE) < 0) // Try To Set Selected Mode And Get Results.
{
// If The Mode Fails, Offer Two Options. Quit Or Use Windowed Mode.
const SDL_MessageBoxData msgbox =
{
SDL_MESSAGEBOX_INFORMATION,
hWnd,
win,
"NeHe GL",
"The Requested Fullscreen Mode Is Not Supported By\nYour Video Card. Use Windowed Mode Instead?",
2,
@@ -385,26 +392,27 @@ bool CreateGLWindow(char* title, int width, int height, int bits, bool fullscree
SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 0); // No Stencil Buffer
if (!(hRC = SDL_GL_CreateContext(hWnd))) // Are We Able To Get A Rendering Context?
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(hWnd, hRC)) // Try To Activate The Rendering Context
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
}
SDL_ShowWindow(hWnd);
SDL_ShowWindow(win);
SDL_GL_SetSwapInterval(1);
ReSizeGLScene(width, height); // Set Up Our Perspective GL Screen
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
@@ -413,7 +421,7 @@ bool CreateGLWindow(char* title, int width, int height, int bits, bool fullscree
return true; // Success
}
void WndProc(SDL_Event* uMsg)
void WndProc(SDL_Event *uMsg)
{
switch (uMsg->type) // Check For Windows Messages
{
@@ -437,7 +445,7 @@ void WndProc(SDL_Event* uMsg)
}
}
int main(int argc, char* argv[])
int main(int argc, char *argv[])
{
SDL_Event msg; // Windows Message Structure
bool done = false; // Bool Variable To Exit Loop
@@ -448,7 +456,7 @@ int main(int argc, char* argv[])
const SDL_MessageBoxData msgbox =
{
/* flags */ SDL_MESSAGEBOX_INFORMATION,
/* window */ hWnd,
/* window */ win,
/* title */ "Start FullScreen?",
/* message */ "Would You Like To Run In Fullscreen Mode?",
/* numbuttons */ 2,
@@ -490,10 +498,10 @@ int main(int argc, char* argv[])
}
else // Not Time To Quit, Update Screen
{
SDL_GL_SwapWindow(hWnd); // Swap Buffers (Double Buffering)
if (keys[SDL_SCANCODE_B] && !bp)
SDL_GL_SwapWindow(win); // Swap Buffers (Double Buffering)
if (keys[SDL_SCANCODE_B] && !bpressed)
{
bp = true;
bpressed = true;
blend = !blend;
if (!blend)
{
@@ -508,12 +516,12 @@ int main(int argc, char* argv[])
}
if (!keys[SDL_SCANCODE_B])
{
bp = false;
bpressed = false;
}
if (keys[SDL_SCANCODE_F] && !fp)
if (keys[SDL_SCANCODE_F] && !fpressed)
{
fp = true;
fpressed = true;
filter += 1;
if (filter > 2)
{
@@ -522,7 +530,7 @@ int main(int argc, char* argv[])
}
if (!keys[SDL_SCANCODE_F])
{
fp = false;
fpressed = false;
}
if (keys[SDL_SCANCODE_PAGEUP])
@@ -591,6 +599,7 @@ int main(int argc, char* argv[])
if (keys[SDL_SCANCODE_F1]) // Is F1 Being Pressed?
{
keys[SDL_SCANCODE_F1] = false; // If So Make Key FALSE
FreeResources();
KillGLWindow(); // Kill Our Current Window
fullscreen = !fullscreen; // Toggle Fullscreen / Windowed Mode
// Recreate Our OpenGL Window
@@ -604,6 +613,7 @@ int main(int argc, char* argv[])
}
// Shutdown
FreeResources();
KillGLWindow(); // Kill The Window
SDL_Quit();
return EXIT_SUCCESS; // Exit The Program