+/*
+ * Copyright (C) 2009-2010 Andy Spencer <andy753421@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define GL_GLEXT_PROTOTYPES
#include <gtk/gtk.h>
#include <gtk/gtkgl.h>
#include <gdk/gdkkeysyms.h>
#include <GL/glu.h>
#include <stdlib.h>
+gdouble pos[3];
+gdouble rot[3];
+guint tex;
+
typedef struct {
- gfloat xyz[3];
+ gfloat xyz[4];
gfloat color[4];
+ gfloat texture[4];
} __attribute__ ((packed)) vert_t;
static int sort_cmp(const void *a, const void *b)
{
int size = 1000000;
gfloat *data = g_new0(gfloat, size);
- glFeedbackBuffer(size, GL_3D_COLOR, data);
+ glFeedbackBuffer(size, GL_4D_COLOR_TEXTURE, data);
glRenderMode(GL_FEEDBACK);
g_print("1st = %f\n", data[0]);
return data;
static void sort_end(gfloat *data)
{
int vertsize = sizeof(vert_t)/sizeof(gfloat);
- int count = glRenderMode(GL_RENDER);
+ int nvals = glRenderMode(GL_RENDER);
/* Set up screen coords */
gint view[4];
glGetIntegerv(GL_VIEWPORT, view);
glMatrixMode(GL_PROJECTION);
+ glPushMatrix();
glLoadIdentity();
- glOrtho(view[0],view[2], view[1],view[3], -10,10);
+ glOrtho(view[0],view[2], view[1],view[3], -100,100);
glMatrixMode(GL_MODELVIEW);
+ glPushMatrix();
glLoadIdentity();
glDisable(GL_LIGHTING);
+ glMatrixMode(GL_TEXTURE);
+ glPushMatrix();
+ glLoadIdentity();
+
+ //glTranslatef(pos[0], pos[1], pos[2]);
+ //glTranslatef(0.05, 0.1, -2);
+ //glRotatef(0.03, 1, 1, 0);
+
+ //gluPerspective(90, 0.8, 0.1, 10);
+
+
/* Sort the vertexes (this only works with all-triangles */
int trisize = 2*sizeof(gfloat) + 3*sizeof(vert_t);
- int ntris = count / trisize;
+ int ntris = nvals*sizeof(gfloat) / trisize;
g_print("%d, %d, %d\n", sizeof(gfloat), trisize, ntris);
- qsort(data, ntris*4, trisize, sort_cmp);
+ qsort(data, ntris, trisize, sort_cmp);
/* Draw the data */
- for (int i = 0; i < count;) {
+ for (int i = 0; i < nvals;) {
gfloat token = data[i++];
if (token == GL_POLYGON_TOKEN) {
gfloat n = data[i++];
/* Draw triangle */
glBegin(GL_TRIANGLES);
for (int j = 0; j < n; j++) {
- //g_print("\t%f, %f, %f\n",
- // verts[j].xyz[0],
- // verts[j].xyz[1],
- // verts[j].xyz[2]);
- glColor4fv(verts[j].color);
- glVertex3fv(verts[j].xyz);
+ g_print("\t%7.2f, %6.2f, %6.2f %6.2f - "
+ "%5.2f, %5.2f, %5.2f, %5.2f\n",
+ verts[j].xyz[0],
+ verts[j].xyz[1],
+ verts[j].xyz[2],
+ verts[j].xyz[3],
+ verts[j].texture[0],
+ verts[j].texture[1],
+ verts[j].texture[2],
+ verts[j].texture[3]);
+ glTexCoord4f(
+ verts[j].texture[0],
+ verts[j].texture[1],
+ verts[j].texture[2],
+ verts[j].texture[3]);
+ glColor4f(
+ verts[j].color[0],
+ verts[j].color[1],
+ verts[j].color[2],
+ verts[j].color[3]);
+ if (j == 2)
+ verts[j].xyz[2] = -100;
+ glVertex3f(
+ verts[j].xyz[0],
+ verts[j].xyz[1],
+ verts[j].xyz[2]);
}
glEnd();
/* Draw line */
- glColor4f(1,1,1,1);
- glBegin(GL_LINE_LOOP);
- for (int j = 0; j < n; j++)
- glVertex3fv(verts[j].xyz);
- glEnd();
+ //glDisable(GL_TEXTURE_2D);
+ //glBegin(GL_LINE_LOOP);
+ //glColor4f(1,1,1,1);
+ //for (int j = 0; j < n; j++)
+ // glVertex3fv(verts[j].xyz);
+ //glEnd();
} else {
g_error("Unknown token: %f\n", token);
}
}
+ glMatrixMode(GL_PROJECTION);
+ glPopMatrix();
+ glMatrixMode(GL_MODELVIEW);
+ glPopMatrix();
+ glMatrixMode(GL_TEXTURE);
+ glPopMatrix();
+ g_free(data);
}
static gboolean on_expose(GtkWidget *drawing, GdkEventExpose *event, gpointer _)
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
- /* Set up projection */
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- glOrtho(1,-1, -0.7,0.7, -10,10);
+ glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
/* Draw teapots */
+ g_print("%f,%f,%f\n", pos[0], pos[1], pos[2]);
+ g_print("%f,%f,%f\n", rot[0], rot[1], rot[2]);
+
glMatrixMode(GL_MODELVIEW);
gfloat *data = sort_start();
glLoadIdentity();
- glTranslatef(0.05, 0.05, -2);
- glRotatef(30, 1, -1, -0.2);
- glColor4f(1.0, 0.2, 0.2, 0.6);
- gdk_gl_draw_teapot(TRUE, 0.5);
+ glTranslatef(pos[0], pos[1], pos[2]);
+ glTranslatef(0.05, 0.1, -2);
+ glRotatef(60, 1, -1, -0.2);
+ glColor4f(1,1,1,1);
+ glDisable(GL_COLOR_MATERIAL);
+ glEnable(GL_TEXTURE_2D);
+ glBindTexture(GL_TEXTURE_2D, tex);
+ glBegin(GL_QUADS);
+ glTexCoord2f(0, 0); glVertex3f(-0.8, 0.5, 0.0);
+ glTexCoord2f(0, 1); glVertex3f(-0.8, -0.5, 0.0);
+ glTexCoord2f(1, 1); glVertex3f( 0.8, -0.5, 0.0);
+ glTexCoord2f(1, 0); glVertex3f( 0.8, 0.5, 0.0);
+ glEnd();
- glLoadIdentity();
- glTranslatef(-0.2, -0.05, -2);
- glRotatef(30, 1, -1, -0.2);
- glColor4f(0.2, 0.2, 1.0, 0.6);
- gdk_gl_draw_teapot(TRUE, 0.5);
+ //glLoadIdentity();
+ //glTranslatef(pos[0], pos[1], pos[2]);
+ //glTranslatef(0.05, 0.1, -2);
+ //glRotatef(30, 1, -1, -0.2);
+ //glColor4f(1.0, 0.2, 0.2, 0.5);
+ ////gdk_gl_draw_teapot(TRUE, 0.5);
+ //gdk_gl_draw_cube(TRUE, 0.5);
+
+ //glLoadIdentity();
+ //glTranslatef(pos[0], pos[1], pos[2]);
+ //glTranslatef(-0.2, 0, -2);
+ //glRotatef(30, 1, -1, -0.2);
+ //glColor4f(0.2, 0.2, 1.0, 0.5);
+ ////gdk_gl_draw_teapot(TRUE, 0.5);
+ //gdk_gl_draw_cube(TRUE, 0.5);
sort_end(data);
/* Flush */
static gboolean on_configure(GtkWidget *drawing, GdkEventConfigure *event, gpointer _)
{
- glViewport(0, 0,
- drawing->allocation.width,
- drawing->allocation.height);
+ gdouble width = drawing->allocation.width;
+ gdouble height = drawing->allocation.height;
+ glViewport(0, 0, width, height);
+
+ /* Set up projection */
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ //gluPerspective(90, width/height, 0.1, 10);
+ gluPerspective(90, 0.8, 0.1, 10);
+ //glOrtho(1,-1, -0.7,0.7, -10,10);
return FALSE;
}
static gboolean on_key_press(GtkWidget *widget, GdkEventKey *event, gpointer _)
{
- if (event->keyval == GDK_q)
- gtk_main_quit();
+ guint kv = event->keyval;
+ if (kv == GDK_q) gtk_main_quit();
+ else if (kv == GDK_h) pos[0] -= 0.02;
+ else if (kv == GDK_j) pos[1] += 0.02;
+ else if (kv == GDK_k) pos[1] -= 0.02;
+ else if (kv == GDK_l) pos[0] += 0.02;
+ else if (kv == GDK_o) pos[2] -= 0.02;
+ else if (kv == GDK_i) pos[2] += 0.02;
+ else if (kv == GDK_H) rot[2] -= 2.0;
+ else if (kv == GDK_J) rot[0] += 2.0;
+ else if (kv == GDK_K) rot[0] -= 2.0;
+ else if (kv == GDK_L) rot[2] += 2.0;
+ gtk_widget_queue_draw(widget);
return FALSE;
}
+static guint load_tex(gchar *filename)
+{
+ GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(filename, NULL);
+ guchar *pixels = gdk_pixbuf_get_pixels(pixbuf);
+ int width = gdk_pixbuf_get_width(pixbuf);
+ int height = gdk_pixbuf_get_height(pixbuf);
+ int alpha = gdk_pixbuf_get_has_alpha(pixbuf);
+ guint tex;
+ glGenTextures(1, &tex);
+ glBindTexture(GL_TEXTURE_2D, tex);
+ glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0,
+ (alpha ? GL_RGBA : GL_RGB), GL_UNSIGNED_BYTE, pixels);
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
+ g_object_unref(pixbuf);
+ return tex;
+}
+
+gchar *gl_program_log(guint program, int *_len)
+{
+ gchar *buf = NULL;
+ int len = 0;
+ glGetProgramiv(program, GL_INFO_LOG_LENGTH, &len);
+ if (len > 0) {
+ buf = g_malloc(len);
+ glGetProgramInfoLog(program, len, &len, buf);
+ }
+ if (_len)
+ *_len = len;
+ return buf;
+}
+
+static void load_shader(gchar *filename)
+{
+ gchar *source;
+ gboolean status = g_file_get_contents(filename, &source, NULL, NULL);
+ if (!status)
+ g_error("Failed to load shader");
+
+ guint program = glCreateProgram();
+ if (!program)
+ g_error("Error creating program");
+
+ guint shader = glCreateShader(GL_VERTEX_SHADER_ARB);
+ if (!shader)
+ g_error("Error creating shader");
+
+ glShaderSource(shader, 1, (const gchar**)&source, NULL);
+ if (glGetError())
+ g_error("Error setting shader source");
+
+ glCompileShader(shader);
+ if (glGetError())
+ g_error("Error compiling shader");
+
+ glAttachShader(program, shader);
+ if (glGetError())
+ g_error("Error attaching shader");
+
+ glLinkProgram(program);
+ if (glGetError())
+ g_error("Error linking program");
+
+ glUseProgram(program);
+ if (glGetError())
+ g_error("Error using program:\n%s", gl_program_log(program, NULL));
+}
+
int main(int argc, char **argv)
{
gtk_init(&argc, &argv);
GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(drawing));
gdk_gl_drawable_gl_begin(gldrawable, glcontext);
+ /* Load texture */
+ tex = load_tex("flag.png");
+
+ /* Load shader */
+ load_shader("sort.glsl");
+
gtk_main();
gdk_gl_drawable_gl_end(gldrawable);
projects / grits / blobdiff