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Improved MaxTextureLevel computation to take the nr. of tex units and both

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texture heaps into account.
This commit is contained in:
Felix Kuehling 2004-03-21 18:50:21 +00:00
parent 57ff474cb0
commit 7e4a56d110
1 changed files with 34 additions and 12 deletions
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46
src/mesa/drivers/dri/savage/savage_xmesa.c
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@ -234,6 +234,7 @@ savageCreateContext( const __GLcontextModes *mesaVis,
savageScreenPrivate *savageScreen = (savageScreenPrivate *)sPriv->private;
drm_savage_sarea_t *saPriv=(drm_savage_sarea_t *)(((char*)sPriv->pSAREA)+
savageScreen->sarea_priv_offset);
GLuint maxTextureSize, minTextureSize, maxTextureLevels;
int i;
imesa = (savageContextPtr)Xcalloc(sizeof(savageContext), 1);
if (!imesa) {
@ -257,18 +258,6 @@ savageCreateContext( const __GLcontextModes *mesaVis,
}
driContextPriv->driverPrivate = imesa;
/* BEGIN;*/
/* Set the maximum texture size small enough that we can guarentee
* that both texture units can bind a maximal texture and have them
* in memory at once.
*/
if (savageScreen->textureSize[SAVAGE_CARD_HEAP] < 2*1024*1024) {
ctx->Const.MaxTextureLevels = 9;
} else if (savageScreen->textureSize[SAVAGE_CARD_HEAP] < 8*1024*1024) {
ctx->Const.MaxTextureLevels = 10;
} else {
ctx->Const.MaxTextureLevels = 11;
}
if (savageScreen->chipset >= S3_SAVAGE4)
ctx->Const.MaxTextureUnits = 2;
else
@ -276,6 +265,39 @@ savageCreateContext( const __GLcontextModes *mesaVis,
ctx->Const.MaxTextureImageUnits = ctx->Const.MaxTextureUnits;
ctx->Const.MaxTextureCoordUnits = ctx->Const.MaxTextureUnits;
/* Set the maximum texture size small enough that we can guarentee
* that all texture units can bind a maximal texture and have them
* in memory at once.
*/
if (savageScreen->textureSize[SAVAGE_CARD_HEAP] >
savageScreen->textureSize[SAVAGE_AGP_HEAP]) {
maxTextureSize = savageScreen->textureSize[SAVAGE_CARD_HEAP];
minTextureSize = savageScreen->textureSize[SAVAGE_AGP_HEAP];
} else {
maxTextureSize = savageScreen->textureSize[SAVAGE_AGP_HEAP];
minTextureSize = savageScreen->textureSize[SAVAGE_CARD_HEAP];
}
if (ctx->Const.MaxTextureUnits == 2) {
/* How to distribute two maximum sized textures to two texture heaps?
* If the smaller heap is less then half the size of the bigger one
* then the maximum size is half the size of the bigger heap.
* Otherwise it's the size of the smaller heap. */
if (minTextureSize < maxTextureSize / 2)
maxTextureSize = maxTextureSize / 2;
else
maxTextureSize = minTextureSize;
}
for (maxTextureLevels = 1; maxTextureLevels <= 11; ++maxTextureLevels) {
GLuint size = 1 << maxTextureLevels;
size *= size * 4; /* 4 bytes per texel */
size *= 2; /* all mipmap levels together take roughly twice the size of
the biggest level */
if (size > maxTextureSize)
break;
}
ctx->Const.MaxTextureLevels = maxTextureLevels-1;
assert (ctx->Const.MaxTextureLevels >= 6); /*spec requires at least 64x64*/
#if 0
ctx->Const.MinLineWidth = 1.0;
ctx->Const.MinLineWidthAA = 1.0;