diff --git a/samples/Makefile b/samples/Makefile index d8df580..7fc4b0f 100644 --- a/samples/Makefile +++ b/samples/Makefile @@ -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 diff --git a/samples/mipmap/Makefile b/samples/mipmap/Makefile new file mode 100644 index 0000000..6b36730 --- /dev/null +++ b/samples/mipmap/Makefile @@ -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) diff --git a/samples/mipmap/main.c b/samples/mipmap/main.c new file mode 100644 index 0000000..1eb1909 --- /dev/null +++ b/samples/mipmap/main.c @@ -0,0 +1,216 @@ +#include +#include + +#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 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; +} diff --git a/samples/mipmap/romdisk/NeHe.bmp b/samples/mipmap/romdisk/NeHe.bmp new file mode 100644 index 0000000..6b3db10 Binary files /dev/null and b/samples/mipmap/romdisk/NeHe.bmp differ diff --git a/samples/mipmap/romdisk/PLACEHOLDER b/samples/mipmap/romdisk/PLACEHOLDER new file mode 100644 index 0000000..e69de29