From 5cc874802b0b8c4462e7e873654e6daa54be00de Mon Sep 17 00:00:00 2001
From: pixel <pixel>
Date: Sun, 4 Jul 2004 11:56:18 +0000
Subject: SOL Demo

---
 lib/glbase.cc | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 84 insertions(+), 2 deletions(-)

(limited to 'lib/glbase.cc')

diff --git a/lib/glbase.cc b/lib/glbase.cc
index 3d89644..9c33c54 100644
--- a/lib/glbase.cc
+++ b/lib/glbase.cc
@@ -1,6 +1,8 @@
 #include <stdio.h>
 #include <SDL.h>
 #include <SDL_opengl.h>
+#include <Output.h>
+#include <Handle.h>
 #include "glbase.h"
 #include "engine.h"
 #include "generic.h"
@@ -10,12 +12,24 @@
 
 mogltk::glbase::glbase(int w, int h, int flags) throw (GeneralException) : mogltk::base(w, h, flags, 0), twoD(0), fovy(60.0) {
     SDL_Surface * surface;
+    GLint bits;
 
     mogltk::engine::setup();
     if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
         throw GeneralException(String("Couldn't initialise Video SubSystem: ") + SDL_GetError());
     }
 
+#if 1
+    SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
+    SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
+    SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
+//    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 32);
+    SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
+    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+    SDL_GL_SetAttribute(SDL_GL_ACCUM_RED_SIZE, 8);
+    SDL_GL_SetAttribute(SDL_GL_ACCUM_GREEN_SIZE, 8);
+    SDL_GL_SetAttribute(SDL_GL_ACCUM_BLUE_SIZE, 8);
+#endif  
     if (!(surface = SDL_SetVideoMode(w, h, 0, flags | SDL_OPENGL | SDL_HWSURFACE))) {
         throw GeneralException(String("Couldn't set GL mode: ") + SDL_GetError());
     }
@@ -25,6 +39,8 @@ mogltk::glbase::glbase(int w, int h, int flags) throw (GeneralException) : moglt
 
     ratio = (GLdouble) surface->w / surface->h;
 
+    glGetIntegerv(GL_STENCIL_BITS, &bits);
+
     printm(M_INFO, "Video resolution: %dx%dx%d (ratio = %3.2f)\n", surface->w, surface->h, surface->format->BitsPerPixel, ratio);
     printm(M_INFO, "\n");
     printm(M_INFO, "OpenGL infos\n");
@@ -34,6 +50,9 @@ mogltk::glbase::glbase(int w, int h, int flags) throw (GeneralException) : moglt
     printm(M_INFO, String("Version   : ") + (char *) glGetString(GL_VERSION) + "\n");
     printm(M_INFO, String("Extensions: ") + (char *) glGetString(GL_EXTENSIONS) + "\n");
 
+    Output e("ext.txt");
+    e.write(glGetString(GL_EXTENSIONS), strlen((char *) glGetString(GL_EXTENSIONS)));
+
     glViewport(0, 0, surface->w, surface->h);
 
     glCullFace(GL_BACK);
@@ -106,10 +125,11 @@ void mogltk::glbase::Leave2DMode(void) {
     twoD = 0;
 }
 
-void mogltk::glbase::Flip() {
+void mogltk::glbase::Flip(bool clear) {
     mogltk::engine::pollevents();
     SDL_GL_SwapBuffers();
-    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    if (clear)
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 }
 
 bool mogltk::glbase::is2D() {
@@ -161,3 +181,65 @@ void mogltk::glbase::changefovy(GLdouble nfoyv) {
     if (!engine::base_o->is2D())
 	gluPerspective(fovy, ratio, 1.0, 1024.0);
 }
+
+inline static unsigned int nextpower(unsigned int n) {
+    unsigned int i;
+
+    if (!n)
+        return n;
+
+    if (ISPOT(n))
+        return n;
+
+    for (i = 31; i >= 0; i--) {
+        if ((n >> i) & 1) {
+            return 1 << (i + 1);
+        }
+    }
+}
+
+mogltk::texture * mogltk::glbase::GrabTexture() {
+    int w = nextpower(GetWidth());
+    int h = nextpower(GetHeight());
+    texture * r = new texture(w, h);
+    SDL_Surface * t;
+
+    t = GrabSurface();
+    SDL_BlitSurface(t, NULL, r->GetSurface(), NULL);
+    SDL_FreeSurface(t);
+
+    return r;
+}
+
+SDL_Surface * mogltk::glbase::GrabSurface() {
+    int i;
+    SDL_Surface * r;
+    Uint8 * pixels = (Uint8 *) malloc(GetWidth() * GetHeight() * 3);
+    Uint8 * s, * d;
+
+    glReadPixels(0, 0, GetWidth(), GetHeight(), GL_RGB, GL_UNSIGNED_BYTE, pixels);
+
+    r = SDL_CreateRGBSurface(SDL_SWSURFACE, GetWidth(), GetHeight(), 24,
+#if SDL_BYTEORDER == SDL_BIG_ENDIAN
+	0xff000000,
+	0x00ff0000,
+	0x0000ff00,
+	0x00000000
+#else
+	0x000000ff,
+	0x0000ff00,
+	0x00ff0000,
+	0x00000000
+#endif
+        );
+
+    for (i = 0; i < GetHeight(); i++) {
+        s = pixels + i * GetWidth() * 3;
+        d = ((Uint8 *) r->pixels) + (GetHeight() - i - 1) * GetWidth() * 3;
+        memcpy(d, s, GetWidth() * 3);
+    }
+
+    free(pixels);
+
+    return r;
+}
-- 
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