Add NeHe lesson 3, and a Vertex Array version of lesson 2

.gitignore

@@ -2,3 +2,5 @@
 .*.swp
 *~
 *.a
+*.elf
+*.img

GL/draw.c

@@ -258,6 +258,9 @@ static void submitVertices(GLenum mode, GLsizei first, GLsizei count, GLenum typ
 
         if(ENABLED_VERTEX_ATTRIBUTES & DIFFUSE_ENABLED_FLAG) {
             _parseColour(&vertex->argb, cptr + (idx * cstride), DIFFUSE_POINTER.size, DIFFUSE_POINTER.type);
+        } else {
+            /* Default to white if colours are disabled */
+            vertex->argb = PVR_PACK_COLOR(1.0f, 1.0f, 1.0f, 1.0f);
         }
 
         if(ENABLED_VERTEX_ATTRIBUTES & UV_ENABLED_FLAG) {

samples/Makefile

@@ -7,4 +7,6 @@ export OBJEXTRA := $(LIB_DIR)/libGLdc.a
 
 
 all:
-	$(KOS_MAKE) -C nehe02 all
+	$(KOS_MAKE) -C nehe02 all
+	$(KOS_MAKE) -C nehe02va all
+	$(KOS_MAKE) -C nehe03 all

samples/nehe02va/Makefile

@@ -0,0 +1,29 @@
+TARGET = nehe02va.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)

samples/nehe02va/main.c

@@ -0,0 +1,86 @@
+#include "gl.h"
+#include "glu.h"
+#include "glkos.h"
+
+/* 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.
+{
+    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
+
+    glEnableClientState(GL_VERTEX_ARRAY); // Enable vertex arrays
+
+    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);
+}
+
+
+/* The main drawing function. */
+void DrawGLScene()
+{
+
+    const GLfloat triangle [] = {
+        0.0f, 1.0f, 0.0f,
+        1.0f, -1.0f, 0.0f,
+        -1.0f, -1.0f, 0.0f
+    };
+
+    const GLfloat square [] = {
+        -1.0f, 1.0f, 0.0f,
+        1.0f, 1.0f, 0.0f,
+        1.0f, -1.0f, 0.0f,
+        -1.0f, -1.0f, 0.0f
+    };
+
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);		// Clear The Screen And The Depth Buffer
+    glLoadIdentity();				// Reset The View
+
+    glTranslatef(-1.5f,0.0f,-6.0f);		// Move Left 1.5 Units And Into The Screen 6.0
+
+    glVertexPointer(3, GL_FLOAT, 0, triangle);
+    glDrawArrays(GL_TRIANGLES, 0, 3);
+
+    glTranslatef(3.0f,0.0f,0.0f);		        // Move Right 3 Units
+
+    glVertexPointer(3, GL_FLOAT, 0, square);
+    glDrawArrays(GL_QUADS, 0, 4);
+
+    // swap buffers to display, since we're double buffered.
+    glKosSwapBuffers();
+}
+
+int main(int argc, char **argv)
+{
+    glKosInit();
+
+    InitGL(640, 480);
+    ReSizeGLScene(640, 480);
+
+    while(1) {
+        DrawGLScene();
+    }
+
+    return 0;
+}

samples/nehe03/Makefile

@@ -0,0 +1,29 @@
+TARGET = nehe03.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)

samples/nehe03/main.c

@@ -0,0 +1,83 @@
+#include "gl.h"
+#include "glu.h"
+#include "glkos.h"
+
+/* 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.
+{
+    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);
+}
+
+
+/* The main drawing function. */
+void DrawGLScene()
+{
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);		// Clear The Screen And The Depth Buffer
+    glLoadIdentity();				// Reset The View
+
+    glTranslatef(-1.5f,0.0f,-6.0f);		// Move Left 1.5 Units And Into The Screen 6.0
+
+    // draw a triangle (in smooth coloring mode)
+    glBegin(GL_POLYGON);				// start drawing a polygon
+        glColor3f(1.0f,0.0f,0.0f);			// Set The Color To Red
+        glVertex3f( 0.0f, 1.0f, 0.0f);		// Top
+        glColor3f(0.0f,1.0f,0.0f);			// Set The Color To Green
+        glVertex3f( 1.0f,-1.0f, 0.0f);		// Bottom Right
+        glColor3f(0.0f,0.0f,1.0f);			// Set The Color To Blue
+        glVertex3f(-1.0f,-1.0f, 0.0f);		// Bottom Left
+    glEnd();					// we're done with the polygon (smooth color interpolation)
+
+    glTranslatef(3.0f,0.0f,0.0f);		        // Move Right 3 Units
+
+    // draw a square (quadrilateral)
+    glColor3f(0.5f,0.5f,1.0f);			// set color to a blue shade.
+    glBegin(GL_QUADS);				// start drawing a polygon (4 sided)
+        glVertex3f(-1.0f, 1.0f, 0.0f);		// Top Left
+        glVertex3f( 1.0f, 1.0f, 0.0f);		// Top Right
+        glVertex3f( 1.0f,-1.0f, 0.0f);		// Bottom Right
+        glVertex3f(-1.0f,-1.0f, 0.0f);		// Bottom Left
+    glEnd(); 				// done with the polygon
+
+    // swap buffers to display, since we're double buffered.
+    glKosSwapBuffers();
+}
+
+int main(int argc, char **argv)
+{
+    glKosInit();
+
+    InitGL(640, 480);
+    ReSizeGLScene(640, 480);
+
+    while(1) {
+        DrawGLScene();
+    }
+
+    return 0;
+}