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cobra.c: Added bilinear filtering and simple alpha blending.

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This commit is contained in:
Ville Linde 2012-08-29 23:26:57 +00:00
parent ba86db9a3c
commit 5212b036f8
1 changed files with 82 additions and 33 deletions
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115
src/mame/drivers/cobra.c
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@ -322,6 +322,7 @@
#include "machine/jvsdev.h"
#include "video/konicdev.h"
#include "video/polynew.h"
#include "video/rgbgen.h"
#include "sound/rf5c400.h"
#define GFXFIFO_IN_VERBOSE 0
@ -334,6 +335,8 @@
#define LOG_GFX_RAM_WRITES 0
#define LOG_DRAW_COMMANDS 0
#define ENABLE_BILINEAR 1
/* Cobra Renderer class */
@ -756,6 +759,41 @@ void cobra_renderer::render_color_scan(INT32 scanline, const extent_t &extent, c
}
}
INLINE rgb_t texture_fetch(UINT32 *texture, int u, int v, int width, int format)
{
UINT32 texel = texture[((v * width) + u) / 2];
if (u & 1)
{
texel &= 0xffff;
}
else
{
texel >>= 16;
}
rgb_t color;
if (format == 6)
{
int r = (texel & 0xf000) >> 8;
int g = (texel & 0x0f00) >> 4;
int b = (texel & 0x00f0) >> 0;
int a = (texel & 0x000f) | ((texel & 0x000f) << 4);
color = MAKE_ARGB(a, r, g, b);
}
else
{
int r = (texel & 0xf800) >> 8;
int g = (texel & 0x07c0) >> 3;
int b = (texel & 0x003e) << 2;
int a = (texel & 0x0001) ? 0xff : 0;
color = MAKE_ARGB(a, r, g, b);
}
return color;
}
void cobra_renderer::render_texture_scan(INT32 scanline, const extent_t &extent, const cobra_polydata &extradata, int threadid)
{
float u = extent.param[POLY_U].start;
@ -792,7 +830,6 @@ void cobra_renderer::render_texture_scan(INT32 scanline, const extent_t &extent,
for (int x = extent.startx; x < extent.stopx; x++)
{
int iu, iv;
UINT32 texel;
if (z <= zb[x] || zmode == 7)
{
@ -803,40 +840,33 @@ void cobra_renderer::render_texture_scan(INT32 scanline, const extent_t &extent,
else
oow = 1.0f / w;
#if !ENABLE_BILINEAR
iu = (int)((u * oow) * texture_width) & 0x7ff;
iv = (int)((v * oow) * texture_height) & 0x7ff;
texel = m_texture_ram[tex_address + (((iv * texture_width) + iu) / 2)];
rgb_t texel = texture_fetch(&m_texture_ram[tex_address], iu, iv, texture_width, tex_format);
if (iu & 1)
{
texel &= 0xffff;
}
else
{
texel >>= 16;
}
#else
UINT32 texr, texg, texb, texa;
float tex_u = (u * oow) * texture_width;
float tex_v = (v * oow) * texture_height;
iu = (int)(tex_u) & 0x7ff;
iv = (int)(tex_v) & 0x7ff;
if (tex_format == 6)
{
texr = (texel & 0xf000) >> 8;
texg = (texel & 0x0f00) >> 4;
texb = (texel & 0x00f0) >> 0;
texa = (texel & 0x000f);
}
else
{
texr = (texel & 0xf800) >> 8;
texg = (texel & 0x07c0) >> 3;
texb = (texel & 0x003e) << 2;
texa = (texel & 0x0001) ? 0xff : 0;
}
float lerp_u = tex_u - (float)(iu);
float lerp_v = tex_v - (float)(iv);
UINT32 goua = (int)(ga);
rgb_t texel00 = texture_fetch(&m_texture_ram[tex_address], iu, iv, texture_width, tex_format);
rgb_t texel01 = texture_fetch(&m_texture_ram[tex_address], iu+1, iv, texture_width, tex_format);
rgb_t texel10 = texture_fetch(&m_texture_ram[tex_address], iu, iv+1, texture_width, tex_format);
rgb_t texel11 = texture_fetch(&m_texture_ram[tex_address], iu+1, iv+1, texture_width, tex_format);
int a = (texa * goua) >> 8;
rgb_t texel = rgba_bilinear_filter(texel00, texel01, texel10, texel11, (int)(lerp_u * 255), (int)(lerp_v * 255));
#endif
int a = RGB_ALPHA(texel);
if (a != 0 || !alpha_test)
{
@ -844,9 +874,20 @@ void cobra_renderer::render_texture_scan(INT32 scanline, const extent_t &extent,
UINT32 goug = (int)(gg);
UINT32 goub = (int)(gb);
int r = (texr * gour) >> 8;
int g = (texg * goug) >> 8;
int b = (texb * goub) >> 8;
int r = (RGB_RED(texel) * gour) >> 8;
int g = (RGB_GREEN(texel) * goug) >> 8;
int b = (RGB_BLUE(texel) * goub) >> 8;
if (a != 0xff)
{
int fb_r = (fb[x] >> 16) & 0xff;
int fb_g = (fb[x] >> 8) & 0xff;
int fb_b = fb[x] & 0xff;
r = ((r * a) >> 8) + ((fb_r * (0xff-a)) >> 8);
g = ((g * a) >> 8) + ((fb_g * (0xff-a)) >> 8);
b = ((b * a) >> 8) + ((fb_b * (0xff-a)) >> 8);
}
if (r > 255) r = 255;
if (g > 255) g = 255;
@ -3118,7 +3159,6 @@ static void ide_interrupt(device_t *device, int state)
static INTERRUPT_GEN( cobra_vblank )
{
/*
cobra_state *cobra = device->machine().driver_data<cobra_state>();
if (cobra->m_vblank_enable & 0x80)
@ -3126,10 +3166,8 @@ static INTERRUPT_GEN( cobra_vblank )
cputag_set_input_line(device->machine(), "maincpu", INPUT_LINE_IRQ0, ASSERT_LINE);
cobra->m_gfx_unk_flag = 0x80;
}
*/
}
static MACHINE_RESET( cobra )
{
cobra_state *cobra = machine.driver_data<cobra_state>();
@ -3304,6 +3342,13 @@ DRIVER_INIT_MEMBER(cobra_state,bujutsu)
rom[0x06] = 0x00;
rom[0x07] = 0x00;
rom[0x08] = 0x00;
rom[0x09] = 0x00;
rom[0x0a] = 0x4a; // J
rom[0x0b] = 0x41; // A
rom[0x0c] = 0x41; // A
rom[0x0d] = 0x00;
// calculate checksum
UINT16 sum = 0;
for (int i=0; i < 14; i+=2)
@ -3320,9 +3365,13 @@ DRIVER_INIT_MEMBER(cobra_state,bujutsu)
// (gfx)
// 0x18932c = 0x38600000 skips check_one_scene()
// (sub)
// 0x2d3568 = 0x60000000 [0x4082001c] skip IRQ fail
// (main)
// 0x5025ac = 0x60000000 [0x4082055c] skip IRQ fail...
// 0x503ec4 = 0x60000000 [0x4186fff8]
// 0x503f00 = 0x60000000 [0x4186fff8]
m_has_psac = false;
}