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A_SN's curve

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive/platform@220 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-08-08 20:57:35 +00:00
parent 59d0f042a1
commit 55a951ddbf
4 changed files with 39 additions and 18 deletions
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27
gp2x/cpuctrl.c
View file

@ -255,11 +255,10 @@ void set_RAM_Timings(int tRC, int tRAS, int tWR, int tMRD, int tRFC, int tRP, in
}
void set_gamma(int g100)
void set_gamma(int g100, int A_SNs_curve)
{
float gamma = (float) g100 / 100;
int i;
//printf ("set gamma = %f\r\n",gamma);
gamma = 1/gamma;
//enable gamma
@ -270,7 +269,29 @@ void set_gamma(int g100)
{
unsigned char g;
unsigned short s;
g =(unsigned char)(255.0*pow(i/255.0,gamma));
const unsigned short grey50=143, grey75=177, grey25=97;
float blah;
if (A_SNs_curve)
{
// The next formula is all about gaussian interpolation
blah = (( -128 * exp(-powf((float) i/64.0f + 2.0f , 2.0f))) +
( -64 * exp(-powf((float) i/64.0f + 1.0f , 2.0f))) +
(grey25 * exp(-powf((float) i/64.0f - 1.0f , 2.0f))) +
(grey50 * exp(-powf((float) i/64.0f - 2.0f , 2.0f))) +
(grey75 * exp(-powf((float) i/64.0f - 3.0f , 2.0f))) +
( 256 * exp(-powf((float) i/64.0f - 4.0f , 2.0f))) +
( 320 * exp(-powf((float) i/64.0f - 5.0f , 2.0f))) +
( 384 * exp(-powf((float) i/64.0f - 6.0f , 2.0f)))) / (1.772637f);
blah += 0.5f;
}
else
{
blah = i;
}
g = (unsigned char)(255.0*pow(blah/255.0,gamma));
//printf("%d : %d\n", i, g);
s = (g<<8) | g;
MEM_REG[0x295E>>1]= s;
MEM_REG[0x295E>>1]= g;

2
gp2x/cpuctrl.h
View file

@ -11,7 +11,7 @@ extern void set_DCLK_Div(unsigned short div); /* 0 to 7 divider (freq=FCLK/(1+di
//extern void Disable_940(void); /* 940t down */
extern void set_RAM_Timings(int tRC, int tRAS, int tWR, int tMRD, int tRFC, int tRP, int tRCD);
extern void set_gamma(int g100);
extern void set_gamma(int g100, int A_SNs_curve);
typedef enum
{

8
gp2x/emu.c
View file

@ -613,7 +613,7 @@ void emu_Deinit(void)
// restore gamma
if (gp2x_old_gamma != 100)
set_gamma(100);
set_gamma(100, 0);
}
@ -1079,10 +1079,10 @@ void emu_Loop(void)
printf(" done\n");
}
if (gp2x_old_gamma != currentConfig.gamma) {
set_gamma(currentConfig.gamma);
if (gp2x_old_gamma != currentConfig.gamma || (EmuOpt_old&0x1000) != (currentConfig.EmuOpt&0x1000)) {
set_gamma(currentConfig.gamma, !!(currentConfig.EmuOpt&0x1000));
gp2x_old_gamma = currentConfig.gamma;
printf("updated gamma to %i\n", currentConfig.gamma);
printf("updated gamma to %i, A_SN's curve: %i\n", currentConfig.gamma, !!(currentConfig.EmuOpt&0x1000));
}
if ((EmuOpt_old&0x2000) != (currentConfig.EmuOpt&0x2000)) {

2
linux/gp2x.c
View file

@ -381,7 +381,7 @@ void set_RAM_Timings(int tRC, int tRAS, int tWR, int tMRD, int tRFC, int tRP, in
{
}
void set_gamma(int g100)
void set_gamma(int g100, int A_SNs_curve)
{
}