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-rw-r--r--src/gl_draw.cxx243
1 files changed, 180 insertions, 63 deletions
diff --git a/src/gl_draw.cxx b/src/gl_draw.cxx
index f0323d4ed..8593f40f6 100644
--- a/src/gl_draw.cxx
+++ b/src/gl_draw.cxx
@@ -29,7 +29,7 @@
// See also Fl_Gl_Window and gl_start.cxx
#include "flstring.h"
-#if HAVE_GL
+#if HAVE_GL || defined(FL_DOXYGEN)
#include <FL/Fl.H>
#include <FL/gl.h>
@@ -129,7 +129,6 @@ void gl_font(int fontid, int size) {
}
#ifndef __APPLE__
-// The OSX build does not use this at present... It probbaly should, though...
static void get_list(int r) {
gl_fontsize->glok[r] = 1;
#if defined(USE_X11)
@@ -151,7 +150,7 @@ static void get_list(int r) {
wglUseFontBitmapsW(fl_gc, ii, ii + 0x03ff, gl_fontsize->listbase+ii);
SelectObject(fl_gc, oldFid);
#elif defined(__APPLE_QUARTZ__)
-// FIXME:
+// handled by textures
#else
# error unsupported platform
#endif
@@ -197,14 +196,15 @@ void gl_remove_displaylist_fonts()
#endif
}
-/**
- Draws an array of n characters of the string in the current font
- at the current position.
- */
#ifdef __APPLE__
static void gl_draw_cocoa(const char* str, int n);
#endif
+/**
+ Draws an array of n characters of the string in the current font
+ at the current position.
+ \see On the Mac OS X platform, see gl_texture_pile_height(int)
+ */
void gl_draw(const char* str, int n) {
#ifdef __APPLE__
gl_draw_cocoa(str, n);
@@ -237,6 +237,7 @@ void gl_draw(const char* str, int n) {
/**
Draws n characters of the string in the current font at the given position
+ \see On the Mac OS X platform, see gl_texture_pile_height(int)
*/
void gl_draw(const char* str, int n, int x, int y) {
glRasterPos2i(x, y);
@@ -245,6 +246,7 @@ void gl_draw(const char* str, int n, int x, int y) {
/**
Draws n characters of the string in the current font at the given position
+ \see On the Mac OS X platform, see gl_texture_pile_height(int)
*/
void gl_draw(const char* str, int n, float x, float y) {
glRasterPos2f(x, y);
@@ -253,6 +255,7 @@ void gl_draw(const char* str, int n, float x, float y) {
/**
Draws a nul-terminated string in the current font at the current position
+ \see On the Mac OS X platform, see gl_texture_pile_height(int)
*/
void gl_draw(const char* str) {
gl_draw(str, strlen(str));
@@ -260,6 +263,7 @@ void gl_draw(const char* str) {
/**
Draws a nul-terminated string in the current font at the given position
+ \see On the Mac OS X platform, see gl_texture_pile_height(int)
*/
void gl_draw(const char* str, int x, int y) {
gl_draw(str, strlen(str), x, y);
@@ -267,6 +271,7 @@ void gl_draw(const char* str, int x, int y) {
/**
Draws a nul-terminated string in the current font at the given position
+ \see On the Mac OS X platform, see gl_texture_pile_height(int)
*/
void gl_draw(const char* str, float x, float y) {
gl_draw(str, strlen(str), x, y);
@@ -289,6 +294,7 @@ void gl_draw(
fl_draw(str, x, -y-h, w, h, align, gl_draw_invert);
}
+/** Measure how wide and tall the string will be when drawn by the gl_draw() function */
void gl_measure(const char* str, int& x, int& y) {fl_measure(str,x,y);}
/**
@@ -351,13 +357,56 @@ void gl_draw_image(const uchar* b, int x, int y, int w, int h, int d, int ld) {
glDrawPixels(w,h,d<4?GL_RGB:GL_RGBA,GL_UNSIGNED_BYTE,(const ulong*)b);
}
-#ifdef __APPLE__
+#if defined( __APPLE__) || defined(FL_DOXYGEN)
#include <FL/glu.h>
-static void gl_draw_cocoa(const char* str, int n)
+// manages a fifo pile of pre-computed string textures
+class gl_texture_fifo {
+ friend void gl_draw_cocoa(const char *, int);
+private:
+ typedef struct { // information for a pre-computed texture
+ GLuint texName; // its name
+ char *utf8; //its text
+ Fl_Font_Descriptor *fdesc; // its font
+ int width; // its width
+ int height; // its height
+ } data;
+ data *fifo; // array of pile elements
+ int size_; // pile height
+ int current; // the oldest texture to have entered the pile
+ int last; // pile top
+ int textures_generated; // true iff glGenTextures has been called
+ void display_texture(int rank);
+ int compute_texture(const char* str, int n);
+ int already_known(const char *str, int n);
+public:
+ gl_texture_fifo(int max = 100); // 100 = default height of texture pile
+ inline int size(void) {return size_; };
+ ~gl_texture_fifo(void);
+};
+
+gl_texture_fifo::gl_texture_fifo(int max)
+{
+ size_ = max;
+ last = current = -1;
+ textures_generated = 0;
+ fifo = (data*)calloc(size_, sizeof(data));
+}
+
+gl_texture_fifo::~gl_texture_fifo()
+{
+ for (int i = 0; i < size_; i++) {
+ if (fifo[i].utf8) free(fifo[i].utf8);
+ if (textures_generated) glDeleteTextures(1, &fifo[i].texName);
+ }
+ free(fifo);
+}
+
+// displays a pre-computed texture on the GL scene
+void gl_texture_fifo::display_texture(int rank)
{
-//setup matrices
+ //setup matrices
GLint matrixMode;
glGetIntegerv (GL_MATRIX_MODE, &matrixMode);
glMatrixMode (GL_PROJECTION);
@@ -370,64 +419,41 @@ static void gl_draw_cocoa(const char* str, int n)
float winh = Fl_Window::current()->h();
glScalef (2.0f / winw, 2.0f / winh, 1.0f);
glTranslatef (-winw / 2.0f, -winh / 2.0f, 0.0f);
-//write str to a bitmap just big enough
- int w = 0, h = 0;
- fl_measure(str, w, h, 0);
- CGColorSpaceRef lut = CGColorSpaceCreateDeviceRGB();
- void *base = calloc(4*w, h);
- if(base == NULL) return;
- fl_gc = CGBitmapContextCreate(base, w, h, 8, w*4, lut, kCGImageAlphaPremultipliedLast);
- CGColorSpaceRelease(lut);
- fl_fontsize = gl_fontsize;
- fl_draw(str, 0, h - fl_descent());
-//put this bitmap in a texture
- static GLuint texName = 0;
- glPushAttrib(GL_TEXTURE_BIT);
- if (0 == texName) glGenTextures (1, &texName);
- glBindTexture (GL_TEXTURE_RECTANGLE_EXT, texName);
- glTexParameteri(GL_TEXTURE_RECTANGLE_EXT, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_RECTANGLE_EXT, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
- glTexImage2D(GL_TEXTURE_RECTANGLE_EXT, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, base);
- glPopAttrib();
- CGContextRelease(fl_gc);
- fl_gc = NULL;
- free(base);
+ //write the texture on screen
GLfloat pos[4];
glGetFloatv(GL_CURRENT_RASTER_POSITION, pos);
- if (texName) {//write the texture on screen
- CGRect bounds = CGRectMake (pos[0], pos[1] - fl_descent(), w, h);
- glPushAttrib(GL_ENABLE_BIT | GL_TEXTURE_BIT | GL_COLOR_BUFFER_BIT); // GL_COLOR_BUFFER_BIT for glBlendFunc, GL_ENABLE_BIT for glEnable / glDisable
-
- glDisable (GL_DEPTH_TEST); // ensure text is not removed by depth buffer test.
- glEnable (GL_BLEND); // for text fading
- glBlendFunc (GL_ONE, GL_ONE_MINUS_SRC_ALPHA); // ditto
- glEnable (GL_TEXTURE_RECTANGLE_EXT);
-
- glBindTexture (GL_TEXTURE_RECTANGLE_EXT, texName);
- glBegin (GL_QUADS);
- glTexCoord2f (0.0f, 0.0f); // draw lower left in world coordinates
- glVertex2f (bounds.origin.x, bounds.origin.y);
-
- glTexCoord2f (0.0f, h); // draw upper left in world coordinates
- glVertex2f (bounds.origin.x, bounds.origin.y + bounds.size.height);
-
- glTexCoord2f (w, h); // draw upper right in world coordinates
- glVertex2f (bounds.origin.x + bounds.size.width, bounds.origin.y + bounds.size.height);
-
- glTexCoord2f (w, 0.0f); // draw lower right in world coordinates
- glVertex2f (bounds.origin.x + bounds.size.width, bounds.origin.y);
- glEnd ();
-
- glPopAttrib();
- glDeleteTextures(1, &texName);
- }
+ CGRect bounds = CGRectMake (pos[0], pos[1] - fl_descent(), fifo[rank].width, fifo[rank].height);
+ glPushAttrib(GL_ENABLE_BIT | GL_TEXTURE_BIT | GL_COLOR_BUFFER_BIT); // GL_COLOR_BUFFER_BIT for glBlendFunc, GL_ENABLE_BIT for glEnable / glDisable
+
+ glDisable (GL_DEPTH_TEST); // ensure text is not removed by depth buffer test.
+ glEnable (GL_BLEND); // for text fading
+ glBlendFunc (GL_ONE, GL_ONE_MINUS_SRC_ALPHA); // ditto
+ glEnable (GL_TEXTURE_RECTANGLE_EXT);
+
+ glBindTexture (GL_TEXTURE_RECTANGLE_EXT, fifo[rank].texName);
+ glBegin (GL_QUADS);
+ glTexCoord2f (0.0f, 0.0f); // draw lower left in world coordinates
+ glVertex2f (bounds.origin.x, bounds.origin.y);
+
+ glTexCoord2f (0.0f, fifo[rank].height); // draw upper left in world coordinates
+ glVertex2f (bounds.origin.x, bounds.origin.y + bounds.size.height);
+
+ glTexCoord2f (fifo[rank].width, fifo[rank].height); // draw upper right in world coordinates
+ glVertex2f (bounds.origin.x + bounds.size.width, bounds.origin.y + bounds.size.height);
+
+ glTexCoord2f (fifo[rank].width, 0.0f); // draw lower right in world coordinates
+ glVertex2f (bounds.origin.x + bounds.size.width, bounds.origin.y);
+ glEnd ();
+
+ glPopAttrib();
// reset original matrices
glPopMatrix(); // GL_MODELVIEW
glMatrixMode (GL_PROJECTION);
glPopMatrix();
glMatrixMode (matrixMode);
-//set the raster position to end of string
- pos[0] += w;
+
+ //set the raster position to end of string
+ pos[0] += fifo[rank].width;
GLdouble modelmat[16];
glGetDoublev (GL_MODELVIEW_MATRIX, modelmat);
GLdouble projmat[16];
@@ -438,9 +464,100 @@ static void gl_draw_cocoa(const char* str, int n)
gluUnProject(pos[0], pos[1], pos[2], modelmat, projmat, viewport, &objX, &objY, &objZ);
glRasterPos2d(objX, objY);
}
-#endif
-#endif
+// pre-computes a string texture
+int gl_texture_fifo::compute_texture(const char* str, int n)
+{
+ current = (current + 1) % size_;
+ if (current > last) last = current;
+ //write str to a bitmap just big enough
+ fifo[current].width = 0, fifo[current].height = 0;
+ fl_measure(str, fifo[current].width, fifo[current].height, 0);
+ CGColorSpaceRef lut = CGColorSpaceCreateDeviceRGB();
+ void *base = calloc(4*fifo[current].width, fifo[current].height);
+ if (base == NULL) return -1;
+ fl_gc = CGBitmapContextCreate(base, fifo[current].width, fifo[current].height, 8, fifo[current].width*4, lut, kCGImageAlphaPremultipliedLast);
+ CGColorSpaceRelease(lut);
+ fl_fontsize = gl_fontsize;
+ fl_draw(str, 0, fifo[current].height - fl_descent());
+ //put this bitmap in a texture
+ glPushAttrib(GL_TEXTURE_BIT);
+ glBindTexture (GL_TEXTURE_RECTANGLE_EXT, fifo[current].texName);
+ glTexParameteri(GL_TEXTURE_RECTANGLE_EXT, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_RECTANGLE_EXT, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexImage2D(GL_TEXTURE_RECTANGLE_EXT, 0, GL_RGBA, fifo[current].width, fifo[current].height, 0, GL_RGBA, GL_UNSIGNED_BYTE, base);
+ glPopAttrib();
+ CGContextRelease(fl_gc);
+ fl_gc = NULL;
+ free(base);
+ if ( fifo[current].utf8 ) free(fifo[current].utf8);
+ fifo[current].utf8 = (char *)malloc(n + 1);
+ memcpy(fifo[current].utf8, str, n);
+ fifo[current].utf8[n] = 0;
+ fifo[current].fdesc = gl_fontsize;
+ return current;
+}
+
+// returns rank of pre-computed texture for a string if it exists
+int gl_texture_fifo::already_known(const char *str, int n)
+{
+ int rank;
+ for ( rank = 0; rank <= last; rank++) {
+ if ( memcmp(str, fifo[rank].utf8, n) == 0 && fifo[rank].utf8[n] == 0 &&
+ fifo[rank].fdesc == gl_fontsize) return rank;
+ }
+ return -1;
+}
+
+static gl_texture_fifo *gl_fifo = NULL; // points to the texture pile class instance
+
+// draws a utf8 string using pre-computed texture if available
+static void gl_draw_cocoa(const char* str, int n)
+{
+ if (! gl_fifo) gl_fifo = new gl_texture_fifo();
+ if (!gl_fifo->textures_generated) {
+ for (int i = 0; i < gl_fifo->size_; i++) glGenTextures (1, &(gl_fifo->fifo[i].texName));
+ gl_fifo->textures_generated = 1;
+ }
+ int rank = gl_fifo->already_known(str, n);
+ if (rank == -1) {
+ rank = gl_fifo->compute_texture(str, n);
+ }
+ gl_fifo->display_texture(rank);
+}
+
+/** \addtogroup group_macosx
+ @{ */
+
+/**
+ \brief Returns the current height of the pile of pre-computed string textures
+ *
+ The default value is 100
+ */
+int gl_texture_pile_height(void)
+{
+ if (! gl_fifo) gl_fifo = new gl_texture_fifo();
+ return gl_fifo->size();
+}
+
+/**
+ \brief Changes the height of the pile of pre-computed string textures
+ *
+ Strings that are often re-displayed can be processed much faster if
+ this pile is set high enough to hold all of them.
+ \param max Height of the texture pile
+ */
+void gl_texture_pile_height(int max)
+{
+ if (gl_fifo) delete gl_fifo;
+ gl_fifo = new gl_texture_fifo(max);
+}
+
+/** @} */
+
+#endif // __APPLE__
+
+#endif // HAVE_GL
//
// End of "$Id$".
generated by cgit v1.2.3 (git 2.25.1) at 2026-02-08 18:42:11 +0000