void gld_SetupFloodStencil(GLWall *wall)
{
int recursion = 0;
// Create stencil
glStencilFunc(GL_EQUAL, recursion, ~0); // create stencil
glStencilOp(GL_KEEP, GL_KEEP, GL_INCR); // increment stencil of valid pixels
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); // don't write to the graphics buffer
gld_EnableTexture2D(GL_TEXTURE0_ARB, false);
glColor3f(1, 1, 1);
glEnable(GL_DEPTH_TEST);
glDepthMask(true);
glBegin(GL_TRIANGLE_FAN);
glVertex3f(wall->glseg->x1, wall->ytop, wall->glseg->z1);
glVertex3f(wall->glseg->x1, wall->ybottom, wall->glseg->z1);
glVertex3f(wall->glseg->x2, wall->ybottom, wall->glseg->z2);
glVertex3f(wall->glseg->x2, wall->ytop, wall->glseg->z2);
glEnd();
glStencilFunc(GL_EQUAL, recursion+1, ~0); // draw sky into stencil
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP); // this stage doesn't modify the stencil
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); // don't write to the graphics buffer
gld_EnableTexture2D(GL_TEXTURE0_ARB, true);
glDisable(GL_DEPTH_TEST);
glDepthMask(false);
}
GLuint CaptureScreenAsTexID(void)
{
GLuint id;
gld_EnableTexture2D(GL_TEXTURE0_ARB, true);
qglGenTextures(1, &id);
qglBindTexture(GL_TEXTURE_2D, id);
qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
#ifdef ANDROID
qglTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
#else
qglTexImage2D(GL_TEXTURE_2D, 0, 3,
#endif
gld_GetTexDimension(SCREENWIDTH), gld_GetTexDimension(SCREENHEIGHT),
0, GL_RGB, GL_UNSIGNED_BYTE, 0);
qglCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, SCREENWIDTH, SCREENHEIGHT);
return id;
}
void gld_DrawFakeSkyStrips(void)
{
int i;
// This draws a valid z-buffer into the stencil's contents to ensure it
// doesn't get overwritten by the level's geometry.
// Because some of outdated hardware has no support for
// glColorMask(0, 0, 0, 0) or something,
// I need to render fake strips of sky before dome with using
// full clearing of color buffer (only in compatibility mode)
if (!gl_compatibility)
{
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); // no graphics
}
gld_EnableTexture2D(GL_TEXTURE0_ARB, false);
for (i = gld_drawinfo.num_items[GLDIT_SWALL] - 1; i >= 0; i--)
{
GLWall* wall = gld_drawinfo.items[GLDIT_SWALL][i].item.wall;
glBegin(GL_TRIANGLE_STRIP);
glVertex3f(wall->glseg->x1,wall->ytop,wall->glseg->z1);
glVertex3f(wall->glseg->x1,wall->ybottom,wall->glseg->z1);
glVertex3f(wall->glseg->x2,wall->ytop,wall->glseg->z2);
glVertex3f(wall->glseg->x2,wall->ybottom,wall->glseg->z2);
glEnd();
}
gld_EnableTexture2D(GL_TEXTURE0_ARB, true);
if (!gl_compatibility)
{
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
}
else
{
glClear(GL_COLOR_BUFFER_BIT);
}
}
int gld_wipe_doMelt(int ticks, int *y_lookup)
{
int i;
int total_w, total_h;
float fU1, fU2, fV1, fV2;
total_w = gld_GetTexDimension(SCREENWIDTH);
total_h = gld_GetTexDimension(SCREENHEIGHT);
fU1 = 0.0f;
fV1 = (float)SCREENHEIGHT / (float)total_h;
fU2 = (float)SCREENWIDTH / (float)total_w;
fV2 = 0.0f;
gld_EnableTexture2D(GL_TEXTURE0_ARB, true);
qglBindTexture(GL_TEXTURE_2D, wipe_scr_end_tex);
qglColor3f(1.0f, 1.0f, 1.0f);
qglBegin(GL_TRIANGLE_STRIP);
{
qglTexCoord2f(fU1, fV1); qglVertex2f(0.0f, 0.0f);
qglTexCoord2f(fU1, fV2); qglVertex2f(0.0f, (float)SCREENHEIGHT);
qglTexCoord2f(fU2, fV1); qglVertex2f((float)SCREENWIDTH, 0.0f);
qglTexCoord2f(fU2, fV2); qglVertex2f((float)SCREENWIDTH, (float)SCREENHEIGHT);
}
qglEnd();
qglBindTexture(GL_TEXTURE_2D, wipe_scr_start_tex);
qglColor3f(1.0f, 1.0f, 1.0f);
qglBegin(GL_QUAD_STRIP);
for (i=0; i <= SCREENWIDTH; i++)
{
int yoffs = MAX(0, y_lookup[i]);
float tx = (float) i / total_w;
float sx = (float) i;
float sy = (float) yoffs;
qglTexCoord2f(tx, fV1); qglVertex2f(sx, sy);
qglTexCoord2f(tx, fV2); qglVertex2f(sx, sy + (float)SCREENHEIGHT);
}
qglEnd();
return 0;
}
void gld_ClearFloodStencil(GLWall *wall)
{
int recursion = 0;
glStencilOp(GL_KEEP, GL_KEEP, GL_DECR);
gld_EnableTexture2D(GL_TEXTURE0_ARB, false);
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); // don't write to the graphics buffer
glColor3f(1, 1, 1);
glBegin(GL_TRIANGLE_FAN);
glVertex3f(wall->glseg->x1, wall->ytop, wall->glseg->z1);
glVertex3f(wall->glseg->x1, wall->ybottom, wall->glseg->z1);
glVertex3f(wall->glseg->x2, wall->ybottom, wall->glseg->z2);
glVertex3f(wall->glseg->x2, wall->ytop, wall->glseg->z2);
glEnd();
// restore old stencil op.
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
glStencilFunc(GL_EQUAL, recursion, ~0);
gld_EnableTexture2D(GL_TEXTURE0_ARB, true);
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
glEnable(GL_DEPTH_TEST);
glDepthMask(true);
}
