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refactor

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a dinosaur
2024-03-12 22:14:00 +11:00
parent 0ba08f7505
commit 2ac4bf8461
1 changed files with 81 additions and 74 deletions
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145
Lesson10.c
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@@ -35,19 +35,19 @@ static const SDL_MessageBoxButtonData yesnobttns[2] =
} }
}; };
const float piover180 = 0.0174532925f; typedef struct tagCAMERA
{
float heading; float heading;
float xpos, zpos; float xpos, zpos;
GLfloat yrot; // Y Rotation GLfloat yrot; // Y Rotation
GLfloat walkbias = 0.0f; GLfloat walkbias, walkbiasangle;
GLfloat walkbiasangle = 0.0f; GLfloat lookupdown;
GLfloat lookupdown = 0.0f; GLfloat z; // Depth Into The Screen
GLfloat z = 0.0f; // Depth Into The Screen } CAMERA;
CAMERA camera;
GLuint filter; // Which Filter To Use GLuint filter; // Which Filter To Use
// Storage For 3 Textures GLuint texture[3] = { 0, 0, 0 }; // Storage For 3 Textures
GLuint texture[3] = { 0, 0, 0 };
typedef struct tagVERTEX typedef struct tagVERTEX
{ {
@@ -138,47 +138,36 @@ bool FlipSurface(SDL_Surface *surface)
return true; return true;
} }
int LoadGLTextures(void) // Load Bitmaps And Convert To Textures int LoadGLTextures(void) // Load bitmap as textures
{ {
int Status = SDL_FALSE; // Status Indicator
SDL_Surface *TextureImage = NULL; // Create Storage Space For The Texture SDL_Surface *TextureImage = NULL; // Create Storage Space For The Texture
// Load The Bitmap, Check For Errors, If Bitmap's Not Found Quit // Load & flip the bitmap, check for errors
if ((TextureImage = SDL_LoadBMP("Data/Mud.bmp")) && FlipSurface(TextureImage)) if (!(TextureImage = SDL_LoadBMP("Data/Mud.bmp")) || !FlipSurface(TextureImage))
{ {
Status = SDL_TRUE; // Set The Status To TRUE return false;
glGenTextures(3, &texture[0]); // Create Three Textures
// Create Nearest Filtered Texture
glBindTexture(GL_TEXTURE_2D, texture[0]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage->w, TextureImage->h, 0, GL_BGR, GL_UNSIGNED_BYTE, TextureImage->pixels);
// Create Linear Filtered Texture
glBindTexture(GL_TEXTURE_2D, texture[1]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage->w, TextureImage->h, 0, GL_BGR, GL_UNSIGNED_BYTE, TextureImage->pixels);
// Create MipMapped Texture
glBindTexture(GL_TEXTURE_2D, texture[2]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage->w, TextureImage->h, 0, GL_BGR, GL_UNSIGNED_BYTE, TextureImage->pixels);
}
SDL_DestroySurface(TextureImage); // Free The Image Structure
return Status; // Return The Status
} }
void FreeResources(void) glGenTextures(3, &texture[0]); // Create three textures
GLint params[3][3] =
{ {
free(sector1.triangle); [0] = { GL_NEAREST, GL_NEAREST, GL_FALSE }, // Nearest filtered
glDeleteTextures(3, texture); [1] = { GL_LINEAR, GL_LINEAR, GL_FALSE }, // Linear filtered
[2] = { GL_LINEAR, GL_LINEAR_MIPMAP_NEAREST, GL_TRUE }, // MipMapped
};
for (int i = 0; i < 3; i++)
{
glBindTexture(GL_TEXTURE_2D, texture[i]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, params[i][0]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, params[i][1]);
glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, params[i][2]);
glTexImage2D(GL_TEXTURE_2D,
0, 3, TextureImage->w, TextureImage->h,
0, GL_BGR, GL_UNSIGNED_BYTE, TextureImage->pixels);
}
SDL_DestroySurface(TextureImage); // Free the image structure
return true;
} }
static void gluPerspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar) static void gluPerspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar)
@@ -244,14 +233,14 @@ void DrawGLScene(void) // Here's Where We Do A
glLoadIdentity(); // Reset The View glLoadIdentity(); // Reset The View
GLfloat x_m, y_m, z_m, u_m, v_m; GLfloat x_m, y_m, z_m, u_m, v_m;
GLfloat xtrans = -xpos; GLfloat xtrans = -camera.xpos;
GLfloat ztrans = -zpos; GLfloat ztrans = -camera.zpos;
GLfloat ytrans = -walkbias - 0.25f; GLfloat ytrans = -camera.walkbias - 0.25f;
GLfloat sceneroty = 360.0f - yrot; GLfloat sceneroty = 360.0f - camera.yrot;
int numtriangles; int numtriangles;
glRotatef(lookupdown, 1.0f, 0.0f, 0.0f); glRotatef(camera.lookupdown, 1.0f, 0.0f, 0.0f);
glRotatef(sceneroty, 0.0f, 1.0f, 0.0f); glRotatef(sceneroty, 0.0f, 1.0f, 0.0f);
glTranslatef(xtrans, ytrans, ztrans); glTranslatef(xtrans, ytrans, ztrans);
@@ -478,65 +467,66 @@ int SDL_AppIterate(void)
if (keys[SDL_SCANCODE_PAGEUP]) if (keys[SDL_SCANCODE_PAGEUP])
{ {
z -= 0.02f; camera.z -= 0.02f;
} }
if (keys[SDL_SCANCODE_PAGEDOWN]) if (keys[SDL_SCANCODE_PAGEDOWN])
{ {
z += 0.02f; camera.z += 0.02f;
} }
const float piover180 = 0.0174532925f;
if (keys[SDL_SCANCODE_UP]) if (keys[SDL_SCANCODE_UP])
{ {
camera.xpos -= sinf(camera.heading * piover180) * 0.05f;
xpos -= (float)sin(heading * piover180) * 0.05f; camera.zpos -= cosf(camera.heading * piover180) * 0.05f;
zpos -= (float)cos(heading * piover180) * 0.05f; if (camera.walkbiasangle >= 359.0f)
if (walkbiasangle >= 359.0f)
{ {
walkbiasangle = 0.0f; camera.walkbiasangle = 0.0f;
} }
else else
{ {
walkbiasangle += 10; camera.walkbiasangle += 10;
} }
walkbias = (float)sin(walkbiasangle * piover180) / 20.0f; camera.walkbias = sinf(camera.walkbiasangle * piover180) / 20.0f;
} }
if (keys[SDL_SCANCODE_DOWN]) if (keys[SDL_SCANCODE_DOWN])
{ {
xpos += (float)sin(heading*piover180) * 0.05f; camera.xpos += sinf(camera.heading * piover180) * 0.05f;
zpos += (float)cos(heading*piover180) * 0.05f; camera.zpos += cosf(camera.heading * piover180) * 0.05f;
if (walkbiasangle <= 1.0f) if (camera.walkbiasangle <= 1.0f)
{ {
walkbiasangle = 359.0f; camera.walkbiasangle = 359.0f;
} }
else else
{ {
walkbiasangle -= 10; camera.walkbiasangle -= 10;
} }
walkbias = (float)sin(walkbiasangle * piover180) / 20.0f; camera.walkbias = sinf(camera.walkbiasangle * piover180) / 20.0f;
} }
if (keys[SDL_SCANCODE_RIGHT]) if (keys[SDL_SCANCODE_RIGHT])
{ {
heading -= 1.0f; camera.heading -= 1.0f;
yrot = heading; camera.yrot = camera.heading;
} }
if (keys[SDL_SCANCODE_LEFT]) if (keys[SDL_SCANCODE_LEFT])
{ {
heading += 1.0f; camera.heading += 1.0f;
yrot = heading; camera.yrot = camera.heading;
} }
if (keys[SDL_SCANCODE_PAGEUP]) if (keys[SDL_SCANCODE_PAGEUP])
{ {
lookupdown -= 1.0f; camera.lookupdown -= 1.0f;
} }
if (keys[SDL_SCANCODE_PAGEDOWN]) if (keys[SDL_SCANCODE_PAGEDOWN])
{ {
lookupdown += 1.0f; camera.lookupdown += 1.0f;
} }
return 0; return 0;
@@ -569,13 +559,30 @@ int SDL_AppInit(int argc, char *argv[])
{ {
return -1; // Quit If Window Was Not Created return -1; // Quit If Window Was Not Created
} }
camera = (CAMERA)
{
.heading = 0.0f,
.xpos = 0.0f,
.zpos = 0.0f,
.yrot = 0.0f,
.walkbias = 0.0f,
.walkbiasangle = 0.0f,
.lookupdown = 0.0f,
.z = 0.0f
};
return 0; return 0;
} }
void SDL_AppQuit() void SDL_AppQuit()
{ {
// Shutdown // Shutdown
FreeResources(); free(sector1.triangle);
if (ctx)
{
glDeleteTextures(3, texture);
}
KillGLWindow(); // Kill The Window KillGLWindow(); // Kill The Window
SDL_Quit(); SDL_Quit();
} }