#include <GL/gl.h>
#include <GL/glu.h>
-guint tex, texl, texr;
+guint tex, texl, texr, mask;
gboolean on_key_press(GtkWidget *widget, GdkEventKey *event, gpointer _)
{
- if (event->keyval == GDK_q)
+ if (event->keyval == GDK_KEY_q)
gtk_main_quit();
return FALSE;
}
gboolean on_expose(GtkWidget *drawing, GdkEventExpose *event, gpointer _)
{
- glClearColor(0.5, 0.5, 1.0, 1.0);
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+ gdouble y = 0;
+ /* Setup view */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1,1, -1,1, 10,-10);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0, 0, -5);
+ glClearColor(0.5, 0.5, 1.0, 1.0);
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+ /* Draw white background rectangle */
glEnable(GL_COLOR_MATERIAL);
glDisable(GL_TEXTURE_2D);
glColor3f(1.0, 1.0, 1.0);
glVertex3f( 0.25, -0.75, 0.0);
glEnd();
- /* Textures */
- glDisable(GL_COLOR_MATERIAL);
+ /* Setup for textures */
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
+ glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+ glDisable(GL_COLOR_MATERIAL);
- gdouble y = 0.875;
+ /* Setup mask */
+ glActiveTexture(GL_TEXTURE1);
+ glEnable(GL_TEXTURE_2D);
+ glBindTexture(GL_TEXTURE_2D, mask);
+ glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+
+ glActiveTexture(GL_TEXTURE0);
+ glEnable(GL_TEXTURE_2D);
+ glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
/* Left */
- glBlendFunc(GL_ONE, GL_ZERO);
glBindTexture(GL_TEXTURE_2D, texl);
glBegin(GL_QUADS);
- glTexCoord2f(0.0, y); glVertex3f(-0.75, 0.0, 0.0);
- glTexCoord2f(0.0, 1.0); glVertex3f(-0.75, 0.5, 0.0);
- glTexCoord2f(2.0, 1.0); glVertex3f( 0.75, 0.5, 0.0);
- glTexCoord2f(2.0, y); glVertex3f( 0.75, 0.0, 0.0);
+ glMultiTexCoord2f(GL_TEXTURE0, 0.0, y); glMultiTexCoord2f(GL_TEXTURE1, 0.0, y); glVertex3f(-0.75, 0.0, 0.0);
+ glMultiTexCoord2f(GL_TEXTURE0, 0.0, 1.0); glMultiTexCoord2f(GL_TEXTURE1, 0.0, 1.0); glVertex3f(-0.75, 0.5, 0.0);
+ glMultiTexCoord2f(GL_TEXTURE0, 2.0, 1.0); glMultiTexCoord2f(GL_TEXTURE1, 2.0, 1.0); glVertex3f( 0.75, 0.5, 0.0);
+ glMultiTexCoord2f(GL_TEXTURE0, 2.0, y); glMultiTexCoord2f(GL_TEXTURE1, 2.0, y); glVertex3f( 0.75, 0.0, 0.0);
glEnd();
/* Right */
- glBlendFunc(GL_ONE, GL_ONE);
glBindTexture(GL_TEXTURE_2D, texr);
glBegin(GL_QUADS);
- glTexCoord2f(-1.0, y); glVertex3f(-0.75, 0.0, 0.0);
- glTexCoord2f(-1.0, 1.0); glVertex3f(-0.75, 0.5, 0.0);
- glTexCoord2f( 1.0, 1.0); glVertex3f( 0.75, 0.5, 0.0);
- glTexCoord2f( 1.0, y); glVertex3f( 0.75, 0.0, 0.0);
+ glMultiTexCoord2f(GL_TEXTURE0, -1.0, y); glMultiTexCoord2f(GL_TEXTURE1, -1.0, y); glVertex3f(-0.75, 0.0, 0.0);
+ glMultiTexCoord2f(GL_TEXTURE0, -1.0, 1.0); glMultiTexCoord2f(GL_TEXTURE1, -1.0, 1.0); glVertex3f(-0.75, 0.5, 0.0);
+ glMultiTexCoord2f(GL_TEXTURE0, 1.0, 1.0); glMultiTexCoord2f(GL_TEXTURE1, 1.0, 1.0); glVertex3f( 0.75, 0.5, 0.0);
+ glMultiTexCoord2f(GL_TEXTURE0, 1.0, y); glMultiTexCoord2f(GL_TEXTURE1, 1.0, y); glVertex3f( 0.75, 0.0, 0.0);
glEnd();
+ glActiveTexture(GL_TEXTURE1);
+ glDisable(GL_TEXTURE_2D);
+ glActiveTexture(GL_TEXTURE0);
+
/* Bottom */
- glBlendFunc(GL_ONE, GL_ZERO);
glBindTexture(GL_TEXTURE_2D, tex);
glBegin(GL_QUADS);
- glTexCoord2f(0.0, 0.0); glVertex3f(-0.75, -0.5, 0.0);
- glTexCoord2f(0.0, 1.0-y); glVertex3f(-0.75, -0.0, 0.0);
- glTexCoord2f(1.0, 1.0-y); glVertex3f( 0.75, -0.0, 0.0);
- glTexCoord2f(1.0, 0.0); glVertex3f( 0.75, -0.5, 0.0);
+ glTexCoord2f( 0.0, 0.0); glVertex3f(-0.75, -0.5, 0.0);
+ glTexCoord2f( 0.0, 1.0-y); glVertex3f(-0.75, -0.0, 0.0);
+ glTexCoord2f( 1.0, 1.0-y); glVertex3f( 0.75, -0.0, 0.0);
+ glTexCoord2f( 1.0, 0.0); glVertex3f( 0.75, -0.5, 0.0);
glEnd();
-
/* Flush */
GdkGLDrawable *gldrawable = gdk_gl_drawable_get_current();
if (gdk_gl_drawable_is_double_buffered(gldrawable))
return FALSE;
}
+guint load_mask(void)
+{
+ guint tex = 0;
+ guint8 byte = 0xff;
+
+ glGenTextures(1, &tex);
+ glBindTexture(GL_TEXTURE_2D, tex);
+
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 1, 1, 0,
+ GL_ALPHA, GL_UNSIGNED_BYTE, &byte);
+
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
+
+ return tex;
+}
+
guint load_tex(gchar *filename)
{
GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(filename, NULL);
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,
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 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);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
+
g_object_unref(pixbuf);
return tex;
}
gdk_gl_drawable_gl_begin(gldrawable, glcontext);
/* Load texture */
+ mask = load_mask();
texl = load_tex("texls.png");
texr = load_tex("texrs.png");
tex = load_tex("tex.png");
projects / grits / blobdiff