Add a mipmap sample
This commit is contained in:
parent
888a48562f
commit
aafb99dede
|
@ -28,3 +28,4 @@ all:
|
|||
$(KOS_MAKE) -C polymark all
|
||||
$(KOS_MAKE) -C polygon_offset all
|
||||
$(KOS_MAKE) -C blend_test all
|
||||
$(KOS_MAKE) -C mipmap all
|
||||
|
|
29
samples/mipmap/Makefile
Normal file
29
samples/mipmap/Makefile
Normal file
|
@ -0,0 +1,29 @@
|
|||
TARGET = mipmap.elf
|
||||
OBJS = main.o
|
||||
|
||||
all: rm-elf $(TARGET)
|
||||
|
||||
include $(KOS_BASE)/Makefile.rules
|
||||
|
||||
clean:
|
||||
-rm -f $(TARGET) $(OBJS) romdisk.*
|
||||
|
||||
rm-elf:
|
||||
-rm -f $(TARGET) romdisk.*
|
||||
|
||||
$(TARGET): $(OBJS) romdisk.o
|
||||
$(KOS_CC) $(KOS_CFLAGS) $(KOS_LDFLAGS) -o $(TARGET) $(KOS_START) \
|
||||
$(OBJS) romdisk.o $(OBJEXTRA) -lm -lkosutils $(KOS_LIBS)
|
||||
|
||||
romdisk.img:
|
||||
$(KOS_GENROMFS) -f romdisk.img -d romdisk -v
|
||||
|
||||
romdisk.o: romdisk.img
|
||||
$(KOS_BASE)/utils/bin2o/bin2o romdisk.img romdisk romdisk.o
|
||||
|
||||
run: $(TARGET)
|
||||
$(KOS_LOADER) $(TARGET)
|
||||
|
||||
dist:
|
||||
rm -f $(OBJS) romdisk.o romdisk.img
|
||||
$(KOS_STRIP) $(TARGET)
|
216
samples/mipmap/main.c
Normal file
216
samples/mipmap/main.c
Normal file
|
@ -0,0 +1,216 @@
|
|||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
|
||||
#include "gl.h"
|
||||
#include "glu.h"
|
||||
#include "glkos.h"
|
||||
|
||||
extern uint8 romdisk[];
|
||||
KOS_INIT_ROMDISK(romdisk);
|
||||
|
||||
/* storage for one texture */
|
||||
int texture[1];
|
||||
|
||||
/* Image type - contains height, width, and data */
|
||||
struct Image {
|
||||
unsigned long sizeX;
|
||||
unsigned long sizeY;
|
||||
char *data;
|
||||
};
|
||||
typedef struct Image Image;
|
||||
|
||||
// quick and dirty bitmap loader...for 24 bit bitmaps with 1 plane only.
|
||||
// See http://www.dcs.ed.ac.uk/~mxr/gfx/2d/BMP.txt for more info.
|
||||
int ImageLoad(char *filename, Image *image) {
|
||||
FILE *file;
|
||||
unsigned long size; // size of the image in bytes.
|
||||
unsigned long i; // standard counter.
|
||||
unsigned short int planes; // number of planes in image (must be 1)
|
||||
unsigned short int bpp; // number of bits per pixel (must be 24)
|
||||
char temp; // temporary color storage for bgr-rgb conversion.
|
||||
|
||||
// make sure the file is there.
|
||||
if ((file = fopen(filename, "rb"))==NULL)
|
||||
{
|
||||
printf("File Not Found : %s\n",filename);
|
||||
return 0;
|
||||
}
|
||||
|
||||
// seek through the bmp header, up to the width/height:
|
||||
fseek(file, 18, SEEK_CUR);
|
||||
|
||||
// read the width
|
||||
if ((i = fread(&image->sizeX, 4, 1, file)) != 1) {
|
||||
printf("Error reading width from %s.\n", filename);
|
||||
return 0;
|
||||
}
|
||||
printf("Width of %s: %lu\n", filename, image->sizeX);
|
||||
|
||||
// read the height
|
||||
if ((i = fread(&image->sizeY, 4, 1, file)) != 1) {
|
||||
printf("Error reading height from %s.\n", filename);
|
||||
return 0;
|
||||
}
|
||||
printf("Height of %s: %lu\n", filename, image->sizeY);
|
||||
|
||||
// calculate the size (assuming 24 bits or 3 bytes per pixel).
|
||||
size = image->sizeX * image->sizeY * 3;
|
||||
|
||||
// read the planes
|
||||
if ((fread(&planes, 2, 1, file)) != 1) {
|
||||
printf("Error reading planes from %s.\n", filename);
|
||||
return 0;
|
||||
}
|
||||
if (planes != 1) {
|
||||
printf("Planes from %s is not 1: %u\n", filename, planes);
|
||||
return 0;
|
||||
}
|
||||
|
||||
// read the bpp
|
||||
if ((i = fread(&bpp, 2, 1, file)) != 1) {
|
||||
printf("Error reading bpp from %s.\n", filename);
|
||||
return 0;
|
||||
}
|
||||
if (bpp != 24) {
|
||||
printf("Bpp from %s is not 24: %u\n", filename, bpp);
|
||||
return 0;
|
||||
}
|
||||
|
||||
// seek past the rest of the bitmap header.
|
||||
fseek(file, 24, SEEK_CUR);
|
||||
|
||||
// read the data.
|
||||
image->data = (char *) malloc(size);
|
||||
if (image->data == NULL) {
|
||||
printf("Error allocating memory for color-corrected image data");
|
||||
return 0;
|
||||
}
|
||||
|
||||
if ((i = fread(image->data, size, 1, file)) != 1) {
|
||||
printf(stderr, "Error reading image data from %s.\n", filename);
|
||||
return 0;
|
||||
}
|
||||
|
||||
for (i=0;i<size;i+=3) { // reverse all of the colors. (bgr -> rgb)
|
||||
temp = image->data[i];
|
||||
image->data[i] = image->data[i+2];
|
||||
image->data[i+2] = temp;
|
||||
}
|
||||
|
||||
// we're done.
|
||||
return 1;
|
||||
}
|
||||
|
||||
// Load Bitmaps And Convert To Textures
|
||||
void LoadGLTextures() {
|
||||
// Load Texture
|
||||
Image *image1;
|
||||
|
||||
// allocate space for texture
|
||||
image1 = (Image *) malloc(sizeof(Image));
|
||||
if (image1 == NULL) {
|
||||
printf("Error allocating space for image");
|
||||
exit(0);
|
||||
}
|
||||
|
||||
if (!ImageLoad("/rd/NeHe.bmp", image1)) {
|
||||
exit(1);
|
||||
}
|
||||
|
||||
// Create Texture
|
||||
glGenTextures(1, &texture[0]);
|
||||
glBindTexture(GL_TEXTURE_2D, texture[0]); // 2d texture (x and y size)
|
||||
|
||||
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); // scale linearly when image bigger than texture
|
||||
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_LINEAR); // scale linearly when image smalled than texture
|
||||
|
||||
// 2d texture, level of detail 0 (normal), 3 components (red, green, blue), x size from image, y size from image,
|
||||
// border 0 (normal), rgb color data, unsigned byte data, and finally the data itself.
|
||||
glTexImage2D(GL_TEXTURE_2D, 0, 3, image1->sizeX, image1->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, image1->data);
|
||||
|
||||
glGenerateMipmapEXT(GL_TEXTURE_2D);
|
||||
};
|
||||
|
||||
/* A general OpenGL initialization function. Sets all of the initial parameters. */
|
||||
void InitGL(int Width, int Height) // We call this right after our OpenGL window is created.
|
||||
{
|
||||
LoadGLTextures();
|
||||
glEnable(GL_TEXTURE_2D);
|
||||
glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // This Will Clear The Background Color To Black
|
||||
glClearDepth(1.0); // Enables Clearing Of The Depth Buffer
|
||||
glDepthFunc(GL_LESS); // The Type Of Depth Test To Do
|
||||
glEnable(GL_DEPTH_TEST); // Enables Depth Testing
|
||||
glShadeModel(GL_SMOOTH); // Enables Smooth Color Shading
|
||||
|
||||
glMatrixMode(GL_PROJECTION);
|
||||
glLoadIdentity(); // Reset The Projection Matrix
|
||||
|
||||
gluPerspective(45.0f,(GLfloat)Width/(GLfloat)Height,0.1f,100.0f); // Calculate The Aspect Ratio Of The Window
|
||||
|
||||
glMatrixMode(GL_MODELVIEW);
|
||||
}
|
||||
|
||||
/* The function called when our window is resized (which shouldn't happen, because we're fullscreen) */
|
||||
void ReSizeGLScene(int Width, int Height)
|
||||
{
|
||||
if (Height == 0) // Prevent A Divide By Zero If The Window Is Too Small
|
||||
Height = 1;
|
||||
|
||||
glViewport(0, 0, Width, Height); // Reset The Current Viewport And Perspective Transformation
|
||||
|
||||
glMatrixMode(GL_PROJECTION);
|
||||
glLoadIdentity();
|
||||
|
||||
gluPerspective(45.0f,(GLfloat)Width/(GLfloat)Height,0.1f,100.0f);
|
||||
glMatrixMode(GL_MODELVIEW);
|
||||
}
|
||||
|
||||
void DrawQuad() {
|
||||
glBegin(GL_QUADS);
|
||||
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 0.0f); // Bottom Left Of The Texture and Quad
|
||||
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 0.0f); // Bottom Right Of The Texture and Quad
|
||||
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 0.0f); // Top Right Of The Texture and Quad
|
||||
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 0.0f); // Top Left Of The Texture and Quad
|
||||
glEnd(); // done with the polygon.
|
||||
}
|
||||
|
||||
/* The main drawing function. */
|
||||
void DrawGLScene()
|
||||
{
|
||||
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
||||
glLoadIdentity();
|
||||
glClearColor(0.5, 0.5, 0.5, 1.0);
|
||||
|
||||
glBindTexture(GL_TEXTURE_2D, texture[0]);
|
||||
|
||||
glTranslatef(-1.5f, 0.0f, -4.5f);
|
||||
DrawQuad();
|
||||
|
||||
glTranslatef(1.0f, 0.0f, -5.0f);
|
||||
DrawQuad();
|
||||
|
||||
glTranslatef(1.5f, 0.0f, -5.0f);
|
||||
DrawQuad();
|
||||
|
||||
glTranslatef(2.0f, 0.0f, -5.0f);
|
||||
DrawQuad();
|
||||
|
||||
glTranslatef(3.5f, 0.0f, -5.0f);
|
||||
DrawQuad();
|
||||
|
||||
glKosSwapBuffers();
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
glKosInit();
|
||||
|
||||
InitGL(640, 480);
|
||||
ReSizeGLScene(640, 480);
|
||||
|
||||
while(1) {
|
||||
DrawGLScene();
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
BIN
samples/mipmap/romdisk/NeHe.bmp
Normal file
BIN
samples/mipmap/romdisk/NeHe.bmp
Normal file
Binary file not shown.
After Width: | Height: | Size: 192 KiB |
0
samples/mipmap/romdisk/PLACEHOLDER
Normal file
0
samples/mipmap/romdisk/PLACEHOLDER
Normal file
Loading…
Reference in New Issue
Block a user