Start implementing a multitexture example

include/glkos.h

@@ -1,5 +1,4 @@
-#ifndef GLKOS_H
+#pragma once
-#define GLKOS_H
 
 #include "gl.h"
 
@@ -40,4 +39,3 @@ GLAPI void APIENTRY glKosSwapBuffers();
 
 __END_DECLS
 
-#endif // GLKOS_H

samples/Makefile

@@ -19,3 +19,4 @@ all:
 	$(KOS_MAKE) -C zclip_trianglestrip all
 	$(KOS_MAKE) -C terrain all
 	$(KOS_MAKE) -C quadmark all
+	$(KOS_MAKE) -C multitexture_arrays all

samples/multitexture_arrays/Makefile

@@ -0,0 +1,29 @@
+TARGET = multitexture_arrays.elf
+OBJS = main.o pvr-texture.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)

samples/multitexture_arrays/main.c

@@ -0,0 +1,121 @@
+/*
+   KallistiOS 2.0.0
+
+   main.c
+   (c)2014 Josh Pearson
+
+   Open GL Multi-Texture example using Vertex Array Submission.
+*/
+
+#include <stdio.h>
+
+#include "gl.h"
+#include "glu.h"
+#include "glkos.h"
+#include "glext.h"
+
+/* Load a PVR texture - located in pvr-texture.c */
+extern GLuint glTextureLoadPVR(char *fname, unsigned char isMipMapped, unsigned char glMipMap);
+
+GLfloat VERTEX_ARRAY[4 * 3] = { -1.0f,  1.0f, 0.0f,
+                                1.0f,  1.0f, 0.0f,
+                                1.0f, -1.0f, 0.0f,
+                                -1.0f, -1.0f, 0.0f
+                              };
+
+GLfloat TEXCOORD_ARRAY[4 * 2] = { 0, 0,
+                                  1, 0,
+                                  1, 1,
+                                  0, 1
+                                };
+
+GLuint ARGB_ARRAY[4 * 1] = { 0xFFFF0000, 0xFF0000FF, 0xFF00FF00, 0xFFFFFF00 };
+
+
+/* Multi-Texture Example using Open GL Vertex Buffer Submission. */
+void RenderCallback(GLuint texID0, GLuint texID1) {
+    glLoadIdentity();
+    glTranslatef(0.0f, 0.0f, -3.0f);
+
+    /* Enable Client States for OpenGL Arrays Submission */
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+    glEnableClientState(GL_COLOR_ARRAY);
+
+    /* Bind texture to GL_TEXTURE0_ARB and set texture parameters */
+    glActiveTextureARB(GL_TEXTURE0_ARB);
+    glEnable(GL_TEXTURE_2D);
+    glBindTexture(GL_TEXTURE_2D, texID0);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_FILTER, GL_LINEAR);
+
+    /* Bind multi-texture to GL_TEXTURE1_ARB and set texture parameters */
+    glActiveTextureARB(GL_TEXTURE1_ARB);
+    glEnable(GL_TEXTURE_2D);
+    glBindTexture(GL_TEXTURE_2D, texID1);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_FILTER, GL_LINEAR);
+    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+
+    /* Set Blending Mode */
+    glBlendFunc(GL_SRC_ALPHA, GL_DST_ALPHA);
+
+    /* Bind texture coordinates to GL_TEXTURE0_ARB */
+    glTexCoordPointer(2, GL_FLOAT, 0, TEXCOORD_ARRAY);
+
+    /* Bind texture coordinates to GL_TEXTURE1_ARB */
+    glClientActiveTextureARB(GL_TEXTURE1_ARB);
+    glTexCoordPointer(2, GL_FLOAT, 0, TEXCOORD_ARRAY);
+    glClientActiveTextureARB(GL_TEXTURE0_ARB);
+
+    /* Bind the Color Array */
+    glColorPointer(1, GL_UNSIGNED_INT, 0, ARGB_ARRAY);
+
+    /* Bind the Vertex Array */
+    glVertexPointer(3, GL_FLOAT, 0, VERTEX_ARRAY);
+
+    /* Render the Vertices as Indexed Arrays using glDrawArrays */
+    glDrawArrays(GL_QUADS, 0, 4);
+
+    /* Disable GL_TEXTURE1 */
+    glActiveTextureARB(GL_TEXTURE1_ARB);
+    glBindTexture(GL_TEXTURE_2D, 0);
+    glDisable(GL_TEXTURE_2D);
+
+    /* Make sure to set glActiveTexture back to GL_TEXTURE0_ARB when finished */
+    glActiveTextureARB(GL_TEXTURE0_ARB);
+    glBindTexture(GL_TEXTURE_2D, 0);
+    glDisable(GL_TEXTURE_2D);
+
+    /* Disable Vertex, Color and Texture Coord Arrays */
+    glDisableClientState(GL_COLOR_ARRAY);
+    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+    glDisableClientState(GL_VERTEX_ARRAY);
+}
+
+extern uint8 romdisk[];
+KOS_INIT_ROMDISK(romdisk);
+
+int main(int argc, char **argv) {
+    /* Notice we do not init the PVR here, that is handled by Open GL */
+    glKosInit();
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    gluPerspective(45.0f, 640.0f / 480.0f, 0.1f, 100.0f);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+
+    /* Load two PVR textures to OpenGL */
+    GLuint texID0 = glTextureLoadPVR("/rd/wp001vq.pvr", 0, 0);
+    GLuint texID1 = glTextureLoadPVR("/rd/FlareWS_256.pvr", 0, 0);
+
+    while(1) {
+        /* Draw the "scene" */
+        RenderCallback(texID0, texID1);
+
+        /* Finish the frame - Notice there is no glKosBegin/FinshFrame */
+        glKosSwapBuffers();
+    }
+
+    return 0;
+}
+

samples/multitexture_arrays/pvr-texture.c

@@ -0,0 +1,175 @@
+/*
+   KallistiOS 2.0.0
+
+   pvr-texture.c
+   (c)2014 Josh PH3NOM Pearson
+
+   Load A PVR Texture to the PVR using Open GL
+*/
+
+#include <kos.h>
+
+#include "gl.h"
+#include "glu.h"
+#include "glkos.h"
+#include "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 *TEX0 = NULL;
+    uint8 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;
+}