From 7aabea010d6dcfdf5bd6656c6a41216025c03af2 Mon Sep 17 00:00:00 2001 From: Hayden Kowalchuk Date: Sun, 29 Sep 2019 11:10:01 -0400 Subject: [PATCH] feat: add kazades mipmap example --- samples/mipmap/Makefile | 29 ++++ samples/mipmap/main.c | 306 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 335 insertions(+) create mode 100644 samples/mipmap/Makefile create mode 100644 samples/mipmap/main.c diff --git a/samples/mipmap/Makefile b/samples/mipmap/Makefile new file mode 100644 index 0000000..71d77a6 --- /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: clean $(TARGET) + $(KOS_CC_BASE)/sh-elf/bin/objcopy -R .stack -O binary $(TARGET) $(basename $(TARGET)) + $(KOS_BASE)/utils/scramble/scramble $(basename $(TARGET)) 1ST_READ.BIN diff --git a/samples/mipmap/main.c b/samples/mipmap/main.c new file mode 100644 index 0000000..388dc9a --- /dev/null +++ b/samples/mipmap/main.c @@ -0,0 +1,306 @@ +#include +#include + +#include "gl.h" +#include "glu.h" +#include "glext.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; +} + +char colors[8][3] = {{255, 0, 0}, + {255, 128, 0}, + {255, 255, 0}, + {128, 255,0}, + {0, 255, 0}, + {0, 255, 128}, + {0, 255, 255}, + {0, 128, 255}}; + +int marker = 0; + +char *miplevel(int w, int h, char *data) +{ + GLuint sx, sy, i; + //GLubyte *prevData = data; + GLubyte *thisData = malloc(w * h * 3); + + /* Do the minification */ + for (sx = 0; sx < w * h; sx++) + { + for (i = 0; i < 3; i++) + { + thisData[(sx*3) + i] = colors[marker][i]; + } + } + marker++; + return thisData; +} + +// 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); + + GLuint thisWidth = image1->sizeX; + int levels = 0; + while(thisWidth > 1){ + thisWidth /= 2; + char *newData = miplevel(thisWidth, thisWidth, image1->data); + glTexImage2D(GL_TEXTURE_2D, ++levels, 3, thisWidth, thisWidth, 0, GL_RGB, GL_UNSIGNED_BYTE, newData); + free(newData); + } +}; + +/* 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. +} + +static GLboolean mipmap_enabled = GL_FALSE; +static GLuint timer = 0; +static GLint mipbias = -7; + +void movebias(void) { + mipbias++; + if(mipbias > 7){ + mipbias = -7; + } +} + +/* The main drawing function. */ +void DrawGLScene() +{ + timer++; + if (timer > 60) + { + timer = 0; + mipmap_enabled = !mipmap_enabled; + + if (mipmap_enabled) + { + printf("Enabling mipmaps!\n"); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); + movebias(); + } + else + { + printf("Disabling mipmaps!\n"); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); + } + } + + 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]); + glTexEnvi(GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, mipbias); + + glTranslatef(-0.5f, 0.0f, -2.5f); + 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; +}