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Add nehe08 sample

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This commit is contained in:
Luke Benstead 2021-04-30 20:47:33 +01:00
parent e67f1fb8f9
commit 0a8d43d47b
4 changed files with 416 additions and 0 deletions
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1
CMakeLists.txt
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@ -132,6 +132,7 @@ gen_sample(nehe05 samples/nehe05/main.c)
gen_sample(nehe06 samples/nehe06/main.c) gen_sample(nehe06 samples/nehe06/main.c)
gen_sample(nehe06_vq samples/nehe06_vq/main.c) gen_sample(nehe06_vq samples/nehe06_vq/main.c)
gen_sample(nehe06_4444twid samples/nehe06_4444twid/main.c) gen_sample(nehe06_4444twid samples/nehe06_4444twid/main.c)
gen_sample(nehe08 samples/nehe08/main.c samples/nehe08/pvr-texture.c)
gen_sample(ortho2d samples/ortho2d/main.c) gen_sample(ortho2d samples/ortho2d/main.c)
gen_sample(paletted samples/paletted/main.c) gen_sample(paletted samples/paletted/main.c)
gen_sample(paletted_pcx samples/paletted_pcx/main.c) gen_sample(paletted_pcx samples/paletted_pcx/main.c)

239
samples/nehe08/main.c Normal file
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@ -0,0 +1,239 @@
/*
KallistiOS 2.0.0
nehe08.c
(c)2021 Luke Benstead
(c)2014 Josh Pearson
(c)2001 Benoit Miller
(c)2000 Jeff Molofee
*/
#ifdef __DREAMCAST__
#include <kos.h>
#endif
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glkos.h>
/* Simple OpenGL example to demonstrate blending and lighting.
Essentially the same thing as NeHe's lesson08 code.
To learn more, go to http://nehe.gamedev.net/.
DPAD controls the cube rotation, button A & B control the depth
of the cube, button X toggles filtering, and button Y toggles alpha
blending.
*/
static GLfloat xrot; /* X Rotation */
static GLfloat yrot; /* Y Rotation */
static GLfloat xspeed; /* X Rotation Speed */
static GLfloat yspeed; /* Y Rotation Speed */
static GLfloat z = -5.0f; /* Depth Into The Screen */
static GLuint filter; /* Which Filter To Use */
static GLuint texture[2]; /* Storage For Two Textures */
/* Load a PVR texture - located in pvr-texture.c */
extern GLuint glTextureLoadPVR(char *fname, unsigned char isMipMapped, unsigned char glMipMap);
void draw_gl(void) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(0.0f, 0.0f, z);
glRotatef(xrot, 1.0f, 0.0f, 0.0f);
glRotatef(yrot, 0.0f, 1.0f, 0.0f);
glBindTexture(GL_TEXTURE_2D, texture[filter]);
glBegin(GL_QUADS);
/* Front Face */
glNormal3f(0.0f, 0.0f, 1.0f);
glTexCoord2f(0.0f, 0.0f);
glVertex3f(-1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 0.0f);
glVertex3f(1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f);
glVertex3f(1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f);
glVertex3f(-1.0f, 1.0f, 1.0f);
/* Back Face */
glNormal3f(0.0f, 0.0f, -1.0f);
glTexCoord2f(1.0f, 0.0f);
glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(1.0f, 1.0f);
glVertex3f(-1.0f, 1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f);
glVertex3f(1.0f, 1.0f, -1.0f);
glTexCoord2f(0.0f, 0.0f);
glVertex3f(1.0f, -1.0f, -1.0f);
/* Top Face */
glNormal3f(0.0f, 1.0f, 0.0f);
glTexCoord2f(0.0f, 1.0f);
glVertex3f(-1.0f, 1.0f, -1.0f);
glTexCoord2f(0.0f, 0.0f);
glVertex3f(-1.0f, 1.0f, 1.0f);
glTexCoord2f(1.0f, 0.0f);
glVertex3f(1.0f, 1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f);
glVertex3f(1.0f, 1.0f, -1.0f);
/* Bottom Face */
glNormal3f(0.0f, -1.0f, 0.0f);
glTexCoord2f(1.0f, 1.0f);
glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f);
glVertex3f(1.0f, -1.0f, -1.0f);
glTexCoord2f(0.0f, 0.0f);
glVertex3f(1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 0.0f);
glVertex3f(-1.0f, -1.0f, 1.0f);
/* Right face */
glNormal3f(1.0f, 0.0f, 0.0f);
glTexCoord2f(1.0f, 0.0f);
glVertex3f(1.0f, -1.0f, -1.0f);
glTexCoord2f(1.0f, 1.0f);
glVertex3f(1.0f, 1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f);
glVertex3f(1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 0.0f);
glVertex3f(1.0f, -1.0f, 1.0f);
/* Left Face */
glNormal3f(-1.0f, 0.0f, 0.0f);
glTexCoord2f(0.0f, 0.0f);
glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(1.0f, 0.0f);
glVertex3f(-1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f);
glVertex3f(-1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f);
glVertex3f(-1.0f, 1.0f, -1.0f);
glEnd();
xrot += xspeed;
yrot += yspeed;
}
#ifdef __DREAMCAST__
extern uint8 romdisk[];
KOS_INIT_ROMDISK(romdisk);
#endif
int main(int argc, char **argv) {
#ifdef __DREAMCAST__
maple_device_t *cont;
cont_state_t *state;
#endif
GLboolean xp = GL_FALSE;
GLboolean yp = GL_FALSE;
GLboolean blend = GL_FALSE;
printf("nehe08 beginning\n");
/* Get basic stuff initialized */
glKosInit();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f, 640.0f / 480.0f, 0.1f, 100.0f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glEnable(GL_TEXTURE_2D);
glShadeModel(GL_SMOOTH);
glClearColor(0.0f, 0.0f, 0.0f, 0.5f);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glColor4f(1.0f, 1.0f, 1.0f, 0.5);
glBlendFunc(GL_SRC_ALPHA, GL_ONE);
/* Enable Lighting and GL_LIGHT0 */
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
/* Set up the textures */
texture[0] = glTextureLoadPVR("/rd/glass.pvr", 0, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
texture[1] = glTextureLoadPVR("/rd/glass.pvr", 0, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
while(1) {
#ifdef __DREAMCAST__
cont = maple_enum_type(0, MAPLE_FUNC_CONTROLLER);
/* Check key status */
state = (cont_state_t *)maple_dev_status(cont);
if(!state) {
printf("Error reading controller\n");
break;
}
if(state->buttons & CONT_START)
break;
if(state->buttons & CONT_A)
z -= 0.02f;
if(state->buttons & CONT_B)
z += 0.02f;
if((state->buttons & CONT_X) && !xp) {
xp = GL_TRUE;
filter += 1;
if(filter > 1)
filter = 0;
}
if(!(state->buttons & CONT_X))
xp = GL_FALSE;
if((state->buttons & CONT_Y) && !yp) {
yp = GL_TRUE;
blend = !blend;
}
if(!(state->buttons & CONT_Y))
yp = GL_FALSE;
if(state->buttons & CONT_DPAD_UP)
xspeed -= 0.01f;
if(state->buttons & CONT_DPAD_DOWN)
xspeed += 0.01f;
if(state->buttons & CONT_DPAD_LEFT)
yspeed -= 0.01f;
if(state->buttons & CONT_DPAD_RIGHT)
yspeed += 0.01f;
#endif
/* Switch to the blended polygon list if needed */
if(blend) {
glEnable(GL_BLEND);
glDepthMask(0);
}
else {
glDisable(GL_BLEND);
glDepthMask(1);
}
/* Draw the GL "scene" */
draw_gl();
/* Finish the frame */
glKosSwapBuffers();
}
return 0;
}

176
samples/nehe08/pvr-texture.c Normal file
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@ -0,0 +1,176 @@
/*
KallistiOS 2.0.0
pvr-texture.c
(c)2014 Josh PH3NOM Pearson
Load A PVR Texture to the PVR using Open GL
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include "GL/gl.h"
#include "GL/glu.h"
#include "GL/glkos.h"
#include "GL/glext.h"
#define PVR_HDR_SIZE 0x20
#define MAX(x, y) ((x > y) ? x : y)
static GLuint PVR_TextureHeight(unsigned char *HDR);
static GLuint PVR_TextureWidth(unsigned char *HDR);
static GLuint PVR_TextureFormat(unsigned char *HDR);
static GLuint _glGetMipmapLevelCount(GLuint width, GLuint height) {
return 1 + floor(log2(MAX(width, height)));
}
static GLuint _glGetMipmapDataSize(GLuint width, GLuint height) {
GLuint size = 0;
GLuint i = 0;
for(; i < _glGetMipmapLevelCount(width, height); ++i) {
size += (width * height * 2);
if(width > 1) {
width /= 2;
}
if(height > 1) {
height /= 2;
}
}
return size;
}
/* Load a PVR texture file into memory, and then bind the texture to Open GL.
fname is the name of the PVR texture file to be opened and read.
isMipMapped should be passed as 1 if the texture contains MipMap levels, 0 otherwise.
glMipMap should be passed as 1 if Open GL should calculate the Mipmap levels, 0 otherwise */
GLuint glTextureLoadPVR(char *fname, unsigned char isMipMapped, unsigned char glMipMap) {
FILE *tex = NULL;
uint16_t *TEX0 = NULL;
uint8_t HDR[PVR_HDR_SIZE];
GLuint texID, texSize, texW, texH, texFormat;
/* Open the PVR texture file, and get its file size */
tex = fopen(fname, "rb");
if(tex == NULL) {
printf("FILE READ ERROR: %s\n", fname);
while(1);
}
fseek(tex, 0, SEEK_END);
texSize = ftell(tex) - PVR_HDR_SIZE;
fseek(tex, 0, SEEK_SET);
/* Read in the PVR texture file header */
fread(HDR, 1, PVR_HDR_SIZE, tex);
/* Extract some information from the PVR texture file header */
texW = PVR_TextureWidth(HDR);
texH = PVR_TextureHeight(HDR);
texFormat = PVR_TextureFormat(HDR);
/* Allocate Some Memory for the texture. If we are using Open GL to build the MipMap,
we need to allocate enough space to hold the MipMap texture levels. */
if(!isMipMapped && glMipMap)
TEX0 = malloc(_glGetMipmapDataSize(texW, texH));
else
TEX0 = malloc(texSize);
fread(TEX0, 1, texSize, tex); /* Read in the PVR texture data */
/* Generate and bind a texture as normal for Open GL */
glGenTextures(1, &texID);
glBindTexture(GL_TEXTURE_2D, texID);
if(texFormat != GL_UNSIGNED_SHORT_5_6_5)
glCompressedTexImage2DARB(GL_TEXTURE_2D,
0,
texFormat,
texW,
texH,
0,
texSize,
TEX0);
else {
fprintf(stderr, "%x\n", texFormat);
glTexImage2D(GL_TEXTURE_2D,
0,
GL_RGB,
texW, texH,
0,
GL_RGB,
texFormat,
TEX0);
if(!isMipMapped && glMipMap)
glGenerateMipmapEXT(GL_TEXTURE_2D);
}
free(TEX0);
return texID;
}
static GLuint PVR_TextureFormat(unsigned char *HDR) {
GLuint color = (GLuint)HDR[PVR_HDR_SIZE - 8];
GLuint format = (GLuint)HDR[PVR_HDR_SIZE - 7];
GLboolean twiddled = format == 0x01;
GLboolean compressed = (format == 0x10 || format == 0x03);
if(compressed) {
if(twiddled) {
switch(color) {
case 0x0: {
return GL_COMPRESSED_ARGB_1555_VQ_TWID_KOS;
} break;
case 0x01: {
return GL_COMPRESSED_RGB_565_VQ_TWID_KOS;
} break;
case 0x02: {
return GL_COMPRESSED_ARGB_4444_VQ_TWID_KOS;
}
break;
default:
fprintf(stderr, "Invalid texture format");
return 0;
}
} else {
switch(color) {
case 0: {
return GL_COMPRESSED_ARGB_1555_VQ_KOS;
} break;
case 1: {
return GL_COMPRESSED_RGB_565_VQ_KOS;
} break;
case 2: {
return GL_COMPRESSED_ARGB_4444_VQ_KOS;
}
break;
default:
fprintf(stderr, "Invalid texture format");
return 0;
}
}
} else {
if(color == 1) {
return GL_UNSIGNED_SHORT_5_6_5;
}
return 0;
}
}
static GLuint PVR_TextureWidth(unsigned char *HDR) {
return (GLuint)HDR[PVR_HDR_SIZE - 4] | HDR[PVR_HDR_SIZE - 3] << 8;
}
static GLuint PVR_TextureHeight(unsigned char *HDR) {
return (GLuint)HDR[PVR_HDR_SIZE - 2] | HDR[PVR_HDR_SIZE - 1] << 8;
}

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samples/nehe08/romdisk/glass.pvr Normal file
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