[D3D 91] Add vertex fog for transformed vertices
Lionel Ulmer
lionel.ulmer at free.fr
Sun Feb 2 05:49:38 CST 2003
Hi all,
This adds fogging for transformed vertices... In this mode we need to handle
the 'fogging' in software mode. I choose the 'fog table' way to prevent
computing the fog formula on each vertex. I have no idea if this is really
faster (ie if it is faster to do '(a * b + (1 - a) * c) / 0xFF' on each
vertex or to get data from a 0x30000 array that may be out of the cache).
Note for Christian : I know that Exp and Exp2 formulas seem not to be
supported in DX6 (did not check DX7) but well, I preferred factorizing the
code :-)
Changelog:
Added fogging for transformed vertices
--
Lionel Ulmer - http://www.bbrox.org/
-------------- next part --------------
--- ../wine_base/dlls/ddraw/mesa_private.h Thu Jan 30 22:07:23 2003
+++ dlls/ddraw/mesa_private.h Sun Feb 2 00:53:52 2003
@@ -104,6 +104,11 @@
/* The last type of vertex drawn */
GL_TRANSFORM_STATE transform_state;
+ /* Used to handle fogging faster... */
+ BYTE fog_table[3 * 0x10000]; /* 3 is for R, G and B
+ 0x10000 is 0xFF for the vertex color and
+ 0xFF for the fog intensity */
+
Display *display;
Drawable drawable;
} IDirect3DDeviceGLImpl;
--- ../wine_base/dlls/ddraw/d3ddevice/mesa.c Sat Feb 1 10:12:21 2003
+++ dlls/ddraw/d3ddevice/mesa.c Sun Feb 2 12:36:57 2003
@@ -689,6 +689,23 @@
return (d*Zproj - c) / (a - b*Zproj);
}
+static void build_fog_table(BYTE *fog_table, DWORD fog_color) {
+ int i;
+
+ TRACE(" rebuilding fog table (%06lx)...\n", fog_color & 0x00FFFFFF);
+
+ for (i = 0; i < 3; i++) {
+ BYTE fog_color_component = (fog_color >> (8 * i)) & 0xFF;
+ DWORD elt;
+ for (elt = 0; elt < 0x10000; elt++) {
+ /* We apply the fog transformation and cache the result */
+ DWORD fog_intensity = elt & 0xFF;
+ DWORD vertex_color = (elt >> 8) & 0xFF;
+ fog_table[(i * 0x10000) + elt] = ((fog_intensity * vertex_color) + ((0xFF - fog_intensity) * fog_color_component)) / 0xFF;
+ }
+ }
+}
+
static void draw_primitive_handle_GL_state(IDirect3DDeviceImpl *This,
BOOLEAN vertex_transformed,
BOOLEAN vertex_lit) {
@@ -710,29 +727,44 @@
glThis->transform_state = GL_TRANSFORM_ORTHO;
d3ddevice_set_ortho(This);
}
+
+ /* TODO: optimize this to not always reset all the fog stuff on all DrawPrimitive call
+ if no fogging state change occured */
if (This->state_block.render_state[D3DRENDERSTATE_FOGENABLE - 1] == TRUE) {
- if (This->state_block.render_state[D3DRENDERSTATE_FOGTABLEMODE - 1] != D3DFOG_NONE) {
- switch (This->state_block.render_state[D3DRENDERSTATE_FOGTABLEMODE - 1]) {
- case D3DFOG_LINEAR: glFogi(GL_FOG_MODE,GL_LINEAR); break;
- case D3DFOG_EXP: glFogi(GL_FOG_MODE,GL_EXP); break;
- case D3DFOG_EXP2: glFogi(GL_FOG_MODE,GL_EXP2); break;
- }
- glFogf(GL_FOG_START,ZfromZproj(This,*(float*)&This->state_block.render_state[D3DRENDERSTATE_FOGSTART - 1]));
- glFogf(GL_FOG_END,ZfromZproj(This,*(float*)&This->state_block.render_state[D3DRENDERSTATE_FOGEND - 1]));
- glEnable(GL_FOG);
- } else if ( (This->state_block.render_state[D3DRENDERSTATE_FOGVERTEXMODE - 1] != D3DFOG_NONE) &&
- (vertex_lit == FALSE) && (vertex_transformed == FALSE) ) {
- /* D3DFOG_EXP and D3DFOG_EXP2 are treated as D3DFOG_LINEAR */
- glFogi(GL_FOG_MODE,GL_LINEAR);
- glFogf(GL_FOG_START,*(float*)&This->state_block.render_state[D3DRENDERSTATE_FOGSTART - 1]);
- glFogf(GL_FOG_END,*(float*)&This->state_block.render_state[D3DRENDERSTATE_FOGEND - 1]);
- glEnable(GL_FOG);
- } else
- glDisable(GL_FOG);
- }
- else
+ if (vertex_transformed == TRUE) {
+ glDisable(GL_FOG);
+ /* Now check if our fog_table still corresponds to the current vertex color.
+ Element '0x..00' is always the fog color as it corresponds to maximum fog intensity */
+ if ((glThis->fog_table[0 * 0x10000 + 0x0000] != ((This->state_block.render_state[D3DRENDERSTATE_FOGCOLOR - 1] >> 0) & 0xFF)) ||
+ (glThis->fog_table[1 * 0x10000 + 0x0000] != ((This->state_block.render_state[D3DRENDERSTATE_FOGCOLOR - 1] >> 8) & 0xFF)) ||
+ (glThis->fog_table[2 * 0x10000 + 0x0000] != ((This->state_block.render_state[D3DRENDERSTATE_FOGCOLOR - 1] >> 16) & 0xFF))) {
+ /* We need to rebuild our fog table.... */
+ build_fog_table(glThis->fog_table, This->state_block.render_state[D3DRENDERSTATE_FOGCOLOR - 1]);
+ }
+ } else {
+ if (This->state_block.render_state[D3DRENDERSTATE_FOGTABLEMODE - 1] != D3DFOG_NONE) {
+ switch (This->state_block.render_state[D3DRENDERSTATE_FOGTABLEMODE - 1]) {
+ case D3DFOG_LINEAR: glFogi(GL_FOG_MODE, GL_LINEAR); break;
+ case D3DFOG_EXP: glFogi(GL_FOG_MODE, GL_EXP); break;
+ case D3DFOG_EXP2: glFogi(GL_FOG_MODE, GL_EXP2); break;
+ }
+ if (vertex_lit == FALSE) {
+ glFogf(GL_FOG_START, *(float*)&This->state_block.render_state[D3DRENDERSTATE_FOGSTART - 1]);
+ glFogf(GL_FOG_END, *(float*)&This->state_block.render_state[D3DRENDERSTATE_FOGEND - 1]);
+ } else {
+ /* Special case of 'pixel fog' */
+ glFogf(GL_FOG_START, ZfromZproj(This, *(float*)&This->state_block.render_state[D3DRENDERSTATE_FOGSTART - 1]));
+ glFogf(GL_FOG_END, ZfromZproj(This, *(float*)&This->state_block.render_state[D3DRENDERSTATE_FOGEND - 1]));
+ }
+ glEnable(GL_FOG);
+ } else {
+ glDisable(GL_FOG);
+ }
+ }
+ } else {
glDisable(GL_FOG);
-
+ }
+
/* Handle the 'no-normal' case */
if ((vertex_lit == FALSE) && (This->state_block.render_state[D3DRENDERSTATE_LIGHTING - 1] == TRUE))
glEnable(GL_LIGHTING);
@@ -950,15 +982,21 @@
/* No else here as we do not know how to handle 'specular' on its own in any case.. */
}
-inline static void handle_diffuse_and_specular(STATEBLOCK *sb, DWORD *color_d, DWORD *color_s, BOOLEAN lighted) {
+inline static void handle_diffuse_and_specular(STATEBLOCK *sb, BYTE *fog_table, DWORD *color_d, DWORD *color_s, BOOLEAN lighted) {
if (lighted == TRUE) {
+ DWORD color = *color_d;
if (sb->render_state[D3DRENDERSTATE_FOGENABLE - 1] == TRUE) {
- /* Special case where the specular value is used to do fogging. TODO */
+ /* Special case where the specular value is used to do fogging */
+ BYTE fog_intensity = *color_s >> 24; /* The alpha value of the specular component is the fog 'intensity' for this vertex */
+ color &= 0xFF000000; /* Only keep the alpha component */
+ color |= fog_table[((*color_d >> 0) & 0xFF) << 8 | fog_intensity] << 0;
+ color |= fog_table[((*color_d >> 8) & 0xFF) << 8 | fog_intensity] << 8;
+ color |= fog_table[((*color_d >> 16) & 0xFF) << 8 | fog_intensity] << 16;
}
if (sb->render_state[D3DRENDERSTATE_SPECULARENABLE - 1] == TRUE) {
/* Standard specular value in transformed mode. TODO */
}
- handle_diffuse_base(sb, color_d);
+ handle_diffuse_base(sb, &color);
} else {
if (sb->render_state[D3DRENDERSTATE_LIGHTING - 1] == TRUE) {
handle_diffuse(sb, color_d, FALSE);
@@ -989,7 +1027,8 @@
DWORD dwFlags)
{
BOOLEAN vertex_lighted = (d3dvtVertexType & D3DFVF_NORMAL) == 0;
-
+ IDirect3DDeviceGLImpl* glThis = (IDirect3DDeviceGLImpl*) This;
+
if (TRACE_ON(ddraw)) {
TRACE(" Vertex format : "); dump_flexible_vertex(d3dvtVertexType);
}
@@ -1036,7 +1075,7 @@
D3DVALUE *position =
(D3DVALUE *) (((char *) lpD3DDrawPrimStrideData->position.lpvData) + i * lpD3DDrawPrimStrideData->position.dwStride);
- handle_diffuse_and_specular(&(This->state_block), color_d, color_s, TRUE);
+ handle_diffuse_and_specular(&(This->state_block), glThis->fog_table, color_d, color_s, TRUE);
handle_texture(tex_coord);
handle_xyzrhw(position);
@@ -1071,7 +1110,7 @@
(DWORD *) (((char *) lpD3DDrawPrimStrideData->diffuse.lpvData) + i * lpD3DDrawPrimStrideData->diffuse.dwStride);
DWORD *color_s =
(DWORD *) (((char *) lpD3DDrawPrimStrideData->specular.lpvData) + i * lpD3DDrawPrimStrideData->specular.dwStride);
- handle_diffuse_and_specular(&(This->state_block), color_d, color_s, vertex_lighted);
+ handle_diffuse_and_specular(&(This->state_block), glThis->fog_table, color_d, color_s, vertex_lighted);
} else {
if (d3dvtVertexType & D3DFVF_SPECULAR) {
DWORD *color_s =
@@ -2294,5 +2333,8 @@
apply_render_state(object, &object->state_block);
/* FIXME: do something similar for ligh_state and texture_stage_state */
+ /* And fill the fog table with the default fog value */
+ build_fog_table(gl_object->fog_table, object->state_block.render_state[D3DRENDERSTATE_FOGCOLOR - 1]);
+
return DD_OK;
}
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