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- Log -----------------------------------------------------------------
commit 5170f0311e07c888631138720cf1ee2673166586
Author: Andy Barajas <and...@gm...>
Date:   Wed Oct 9 16:50:38 2024 -0700

    Add pvr palette related examples (#802)

-----------------------------------------------------------------------

Summary of changes:
 doc/CHANGELOG.md                                   |   2 +
 examples/dreamcast/pvr/palette/4bpp/4bpp.c         | 181 +++++++++++++++++++
 .../{filesystem/pty => pvr/palette/4bpp}/Makefile  |  10 +-
 examples/dreamcast/pvr/palette/8bpp/8bpp.c         | 173 ++++++++++++++++++
 .../{filesystem/pty => pvr/palette/8bpp}/Makefile  |  10 +-
 .../pty => pvr/palette/wormhole}/Makefile          |   9 +-
 examples/dreamcast/pvr/palette/wormhole/wormhole.c | 198 +++++++++++++++++++++
 examples/dreamcast/readme.md                       |   1 +
 8 files changed, 569 insertions(+), 15 deletions(-)
 create mode 100644 examples/dreamcast/pvr/palette/4bpp/4bpp.c
 copy examples/dreamcast/{filesystem/pty => pvr/palette/4bpp}/Makefile (76%)
 create mode 100644 examples/dreamcast/pvr/palette/8bpp/8bpp.c
 copy examples/dreamcast/{filesystem/pty => pvr/palette/8bpp}/Makefile (76%)
 copy examples/dreamcast/{filesystem/pty => pvr/palette/wormhole}/Makefile (81%)
 create mode 100644 examples/dreamcast/pvr/palette/wormhole/wormhole.c

diff --git a/doc/CHANGELOG.md b/doc/CHANGELOG.md
index f987f66f..736668db 100644
--- a/doc/CHANGELOG.md
+++ b/doc/CHANGELOG.md
@@ -9,6 +9,8 @@ Platform-specific changes are prefixed with the platform name, otherwise the cha
 - Enabled hybrid PVR DR/DMA vertex submission in driver + sped up pvr_prim() [FG]
 - Add thread priority boosting system [Paul Cercueil = PC]
 - Add performance monitor API [PC]
+- Add/Fixed stat() implementations for all filesystems [AB]
+- **Dreamcast**: Add network speedtest and pvr palette examples [AB]
 
 ## KallistiOS version 2.1.0
 - Cleaned up generated stubs files on a make clean [Lawrence Sebald == LS]
diff --git a/examples/dreamcast/pvr/palette/4bpp/4bpp.c b/examples/dreamcast/pvr/palette/4bpp/4bpp.c
new file mode 100644
index 00000000..04cebaf0
--- /dev/null
+++ b/examples/dreamcast/pvr/palette/4bpp/4bpp.c
@@ -0,0 +1,181 @@
+/* KallistiOS ##version##
+
+   4bpp.c
+   Copyright (C) 2024 Andress Barajas
+*/
+
+/*
+   4bpp example that is a variation of the 8bpp example written by
+   Tvspelsfreak.
+
+   This demo showcases the use of 4-bit palette-based textures on the Dreamcast. 
+   The demo generates a radial gradient texture in RAM and uploads it to VRAM. 
+   Since the texture uses 4bpp (16 colors), the palette consists of 16 entries, 
+   and the texture is rendered as a static image. The colors in the palette are 
+   continuously cycled through a smooth transition effect, creating an animated 
+   appearance for the static gradient.
+
+   The palette animation is driven by a sine wave function that modulates the 
+   red, green, and blue color channels based on the frame number. The player can 
+   press the START button to exit the demo.
+*/
+
+#include <stdlib.h>
+#include <math.h>
+
+#include <dc/pvr.h>
+#include <dc/maple.h>
+#include <dc/fmath.h>
+#include <dc/maple/controller.h>
+
+#define TEXTURE_WIDTH 256
+#define TEXTURE_HEIGHT 256
+#define PALETTE_ENTRY_COUNT 16
+
+static pvr_poly_hdr_t hdr;
+
+static void draw_screen(void) {
+    pvr_vertex_t vert;
+
+    pvr_prim(&hdr, sizeof(hdr));
+
+    vert.argb = PVR_PACK_COLOR(1.0f, 1.0f, 1.0f, 1.0f);
+    vert.oargb = 0;
+    vert.flags = PVR_CMD_VERTEX;
+
+    vert.x = 0.0f;
+    vert.y = 0.0f;
+    vert.z = 1.0f;
+    vert.u = 0.0f;
+    vert.v = 0.0f;
+    pvr_prim(&vert, sizeof(vert));
+
+    vert.x = 640.0f;
+    vert.y = 0.0f;
+    vert.z = 1.0f;
+    vert.u = 1.0f;
+    vert.v = 0.0f;
+    pvr_prim(&vert, sizeof(vert));
+
+    vert.x = 0.0f;
+    vert.y = 480.0f;
+    vert.z = 1.0f;
+    vert.u = 0.0f;
+    vert.v = 1.0f;
+    pvr_prim(&vert, sizeof(vert));
+
+    vert.x = 640.0f;
+    vert.y = 480.0f;
+    vert.z = 1.0f;
+    vert.u = 1.0f;
+    vert.v = 1.0f;
+    vert.flags = PVR_CMD_VERTEX_EOL;
+    pvr_prim(&vert, sizeof(vert));
+}
+
+static float distance(float x0, float y0, float x1, float y1) {
+    const float dx = x1 - x0;
+    const float dy = y1 - y0;
+
+    return fsqrt(dx * dx + dy * dy);
+}
+
+static pvr_ptr_t generate_texture(uint32_t width, uint32_t height) {
+    int i, j, mid_x, mid_y;
+    float max_dist;
+
+    uint8_t *texbuf;
+    pvr_ptr_t texptr;
+
+    /* Calculate texture midpoint and greatest distance from the
+       midpoint to another point for future usage */
+
+    mid_x = width / 2;
+    mid_y = height / 2;
+    max_dist = distance(0, 0, mid_x, mid_y);
+
+    /* Allocate temp storage in RAM to generate texture in */
+    texbuf = calloc(width * height / 2, sizeof(uint8_t));
+
+    /* Generate the texture */
+    for(i = 0; i < height; i++)
+        for(j = 0; j < width; j++) {
+            uint8_t color = (fsin((distance(j, i, mid_x, mid_y) / max_dist) * F_PI) * 16.0f);
+            if (j % 2 == 0)
+                /* Store in high nibble for even pixels */
+                texbuf[i * (width / 2) + (j / 2)] = color << 4;  
+            else
+                /* Store in low nibble for odd pixels */
+                texbuf[i * (width / 2) + (j / 2)] |= color;      
+        }
+
+    /* Allocate VRAM for the texture and upload it, twiddling it in the process */
+    texptr = pvr_mem_malloc(width * height / 2);
+    pvr_txr_load_ex(texbuf, texptr, width, height, PVR_TXRLOAD_4BPP);
+
+    /* As the texture is now residing in VRAM, we can free the temp storage
+       and return the VRAM pointer */
+    free(texbuf);
+
+    return texptr;
+}
+
+static void animate_palette(uint32_t frame) {
+    uint32_t i, val;
+
+    for(i = 0; i < PALETTE_ENTRY_COUNT; i++) {
+        /* Palette cycling, with a larger step between colors */
+        val = (frame + i * 16) & 0xFF;  
+        pvr_set_pal_entry(i, 0xFF00003F | (val << 16) | (val / 2 << 8));
+    }
+}
+
+static int check_start(void) {
+    MAPLE_FOREACH_BEGIN(MAPLE_FUNC_CONTROLLER, cont_state_t, st)
+
+    if(st->buttons & CONT_START)
+        return 1;
+
+    MAPLE_FOREACH_END()
+    return 0;
+}
+
+int main(int argc, char** argv) {
+    uint32_t frame;
+    pvr_ptr_t texptr;
+    pvr_poly_cxt_t cxt;
+
+    pvr_init_defaults();
+
+    /* First select a palette format */
+    pvr_set_pal_format(PVR_PAL_ARGB8888);
+
+    /* Initialize the texture */
+    texptr = generate_texture(TEXTURE_WIDTH, TEXTURE_HEIGHT);
+
+    /* Setup PVR context */
+    pvr_poly_cxt_txr(&cxt, PVR_LIST_OP_POLY, PVR_TXRFMT_PAL4BPP | 
+                    PVR_TXRFMT_4BPP_PAL(0), TEXTURE_WIDTH, TEXTURE_HEIGHT, 
+                    texptr, PVR_FILTER_BILINEAR);
+    pvr_poly_compile(&hdr, &cxt);
+
+    frame = 0;
+    while(!check_start()) {
+        frame = (frame + 1) % 256; 
+        animate_palette(frame);
+
+        pvr_wait_ready();
+        pvr_scene_begin();
+
+        pvr_list_begin(PVR_LIST_OP_POLY);
+
+        draw_screen();
+
+        pvr_list_finish();
+        pvr_scene_finish();
+    }
+
+    pvr_mem_free(texptr);
+
+    return 0;
+}
diff --git a/examples/dreamcast/filesystem/pty/Makefile b/examples/dreamcast/pvr/palette/4bpp/Makefile
similarity index 76%
copy from examples/dreamcast/filesystem/pty/Makefile
copy to examples/dreamcast/pvr/palette/4bpp/Makefile
index 4b6182d5..7cf22c02 100644
--- a/examples/dreamcast/filesystem/pty/Makefile
+++ b/examples/dreamcast/pvr/palette/4bpp/Makefile
@@ -1,12 +1,11 @@
 #
-# fs_pty test program
-#
+# PVR Palette 4bpp example
+# Copyright (C) 2011 Tvspelsfreak
 # Copyright (C) 2024 Andress Barajas
 #   
 
-TARGET = pty.elf
-
-OBJS = pty.o
+TARGET = 4bpp.elf
+OBJS = 4bpp.o
 
 all: rm-elf $(TARGET)
 
@@ -27,3 +26,4 @@ run: $(TARGET)
 dist: $(TARGET)
 	-rm -f $(OBJS)
 	$(KOS_STRIP) $(TARGET)
+
diff --git a/examples/dreamcast/pvr/palette/8bpp/8bpp.c b/examples/dreamcast/pvr/palette/8bpp/8bpp.c
new file mode 100644
index 00000000..4adb4489
--- /dev/null
+++ b/examples/dreamcast/pvr/palette/8bpp/8bpp.c
@@ -0,0 +1,173 @@
+/* KallistiOS ##version##
+
+   8bpp.c
+   Copyright (C) 2011 Tvspelsfreak
+   Copyright (C) 2024 Andress Barajas
+*/
+
+/*
+   8bpp example written by Tvspelsfreak
+
+   This demo showcases a simple use of 8-bit palette-based textures on the 
+   Dreamcast. The demo generates a radial gradient texture in RAM and uploads 
+   it to VRAM. The gradient texture is rendered as a static image, but the colors
+   in the palette are continuously cycled through a smooth transition effect, 
+   making the gradient appear to animate over time.
+
+   The palette animation is driven by a simple sine wave, with the red, green, 
+   and blue channels modulating based on the frame number. The player can press 
+   the START button to exit the demo.
+*/
+
+#include <stdlib.h>
+#include <math.h>
+
+#include <dc/pvr.h>
+#include <dc/maple.h>
+#include <dc/fmath.h>
+#include <dc/maple/controller.h>
+
+#define TEXTURE_WIDTH 256
+#define TEXTURE_HEIGHT 256
+#define PALETTE_ENTRY_COUNT 256
+
+static pvr_poly_hdr_t hdr;
+
+static void draw_screen(void) {
+    pvr_vertex_t vert;
+
+    pvr_prim(&hdr, sizeof(hdr));
+
+    vert.argb = PVR_PACK_COLOR(1.0f, 1.0f, 1.0f, 1.0f);
+    vert.oargb = 0;
+    vert.flags = PVR_CMD_VERTEX;
+
+    vert.x = 0.0f;
+    vert.y = 0.0f;
+    vert.z = 1.0f;
+    vert.u = 0.0f;
+    vert.v = 0.0f;
+    pvr_prim(&vert, sizeof(vert));
+
+    vert.x = 640.0f;
+    vert.y = 0.0f;
+    vert.z = 1.0f;
+    vert.u = 1.0f;
+    vert.v = 0.0f;
+    pvr_prim(&vert, sizeof(vert));
+
+    vert.x = 0.0f;
+    vert.y = 480.0f;
+    vert.z = 1.0f;
+    vert.u = 0.0f;
+    vert.v = 1.0f;
+    pvr_prim(&vert, sizeof(vert));
+
+    vert.x = 640.0f;
+    vert.y = 480.0f;
+    vert.z = 1.0f;
+    vert.u = 1.0f;
+    vert.v = 1.0f;
+    vert.flags = PVR_CMD_VERTEX_EOL;
+    pvr_prim(&vert, sizeof(vert));
+}
+
+static float distance(float x0, float y0, float x1, float y1) {
+    const float dx = x1 - x0;
+    const float dy = y1 - y0;
+
+    return fsqrt(dx * dx + dy * dy);
+}
+
+static pvr_ptr_t generate_texture(uint32_t width, uint32_t height) {
+    int i, j, mid_x, mid_y;
+    float max_dist;
+
+    uint8_t *texbuf;
+    pvr_ptr_t texptr;
+
+    /* Calculate texture midpoint and greatest distance from the
+       midpoint to another point for future usage */
+
+    mid_x = width / 2;
+    mid_y = height / 2;
+    max_dist = distance(0, 0, mid_x, mid_y);
+
+    /* Allocate temp storage in RAM to generate texture in */
+    texbuf = calloc(width * height, sizeof(uint8_t));
+
+    /* Generate the texture */
+    for(i = 0; i < height; i++)
+        for(j = 0; j < width; j++)
+            texbuf[i * width + j] = fsin((distance(j, i, mid_x, mid_y) / max_dist) * F_PI) * 256.0f;
+
+    /* Allocate VRAM for the texture and upload it, twiddling it in the process */
+    texptr = pvr_mem_malloc(width * height);
+    pvr_txr_load_ex(texbuf, texptr, width, height, PVR_TXRLOAD_8BPP);
+
+    /* As the texture is now residing in VRAM, we can free the temp storage
+       and return the VRAM pointer */
+    free(texbuf);
+
+    return texptr;
+}
+
+static void animate_palette(uint32_t frame) {
+    uint32_t i, val;
+
+    for(i = 0;i < PALETTE_ENTRY_COUNT; i++) {
+        val = (frame + i) & 0xFF;
+        pvr_set_pal_entry(i, 0xFF00003F | ( val << 16 ) | ( val/2 << 8 ));
+    }
+}
+
+static int check_start(void) {
+    MAPLE_FOREACH_BEGIN(MAPLE_FUNC_CONTROLLER, cont_state_t, st)
+
+    if(st->buttons & CONT_START)
+        return 1;
+
+    MAPLE_FOREACH_END()
+    return 0;
+}
+
+int main(int argc, char** argv) {
+    uint32_t frame;
+    pvr_ptr_t texptr;
+    pvr_poly_cxt_t cxt;
+
+    pvr_init_defaults();
+
+    /* First select a palette format */
+    pvr_set_pal_format(PVR_PAL_ARGB8888);
+
+    /* Initialize the texture */
+    texptr = generate_texture(TEXTURE_WIDTH, TEXTURE_HEIGHT);
+
+    /* Setup PVR context */
+    pvr_poly_cxt_txr(&cxt, PVR_LIST_OP_POLY, PVR_TXRFMT_PAL8BPP | 
+                    PVR_TXRFMT_8BPP_PAL(0), TEXTURE_WIDTH, TEXTURE_HEIGHT, 
+                    texptr, PVR_FILTER_BILINEAR);
+    pvr_poly_compile(&hdr, &cxt);
+
+    frame = 0;
+    while(!check_start()) {
+        frame = (frame + 1) % 256;
+
+        animate_palette(frame);
+
+        pvr_wait_ready();
+        pvr_scene_begin();
+
+        pvr_list_begin(PVR_LIST_OP_POLY);
+
+        draw_screen();
+
+        pvr_list_finish();
+        pvr_scene_finish();
+    }
+
+    pvr_mem_free(texptr);
+
+    return 0;
+}
diff --git a/examples/dreamcast/filesystem/pty/Makefile b/examples/dreamcast/pvr/palette/8bpp/Makefile
similarity index 76%
copy from examples/dreamcast/filesystem/pty/Makefile
copy to examples/dreamcast/pvr/palette/8bpp/Makefile
index 4b6182d5..62b1b554 100644
--- a/examples/dreamcast/filesystem/pty/Makefile
+++ b/examples/dreamcast/pvr/palette/8bpp/Makefile
@@ -1,12 +1,11 @@
 #
-# fs_pty test program
-#
+# PVR Palette 8bpp example
+# Copyright (C) 2011 Tvspelsfreak
 # Copyright (C) 2024 Andress Barajas
 #   
 
-TARGET = pty.elf
-
-OBJS = pty.o
+TARGET = 8bpp.elf
+OBJS = 8bpp.o
 
 all: rm-elf $(TARGET)
 
@@ -27,3 +26,4 @@ run: $(TARGET)
 dist: $(TARGET)
 	-rm -f $(OBJS)
 	$(KOS_STRIP) $(TARGET)
+
diff --git a/examples/dreamcast/filesystem/pty/Makefile b/examples/dreamcast/pvr/palette/wormhole/Makefile
similarity index 81%
copy from examples/dreamcast/filesystem/pty/Makefile
copy to examples/dreamcast/pvr/palette/wormhole/Makefile
index 4b6182d5..03765f07 100644
--- a/examples/dreamcast/filesystem/pty/Makefile
+++ b/examples/dreamcast/pvr/palette/wormhole/Makefile
@@ -1,12 +1,10 @@
 #
-# fs_pty test program
-#
+# PVR Palette wormhole example
 # Copyright (C) 2024 Andress Barajas
 #   
 
-TARGET = pty.elf
-
-OBJS = pty.o
+TARGET = wormhole.elf
+OBJS = wormhole.o
 
 all: rm-elf $(TARGET)
 
@@ -27,3 +25,4 @@ run: $(TARGET)
 dist: $(TARGET)
 	-rm -f $(OBJS)
 	$(KOS_STRIP) $(TARGET)
+
diff --git a/examples/dreamcast/pvr/palette/wormhole/wormhole.c b/examples/dreamcast/pvr/palette/wormhole/wormhole.c
new file mode 100644
index 00000000..e8be75f6
--- /dev/null
+++ b/examples/dreamcast/pvr/palette/wormhole/wormhole.c
@@ -0,0 +1,198 @@
+/* KallistiOS ##version##
+
+   wormhole.c
+   Copyright (C) 2024 Andress Barajas
+*/
+
+/*
+   This demo demonstrates the use of 8-bit palette-based textures to generate
+   and animate a wormhole effect on the Dreamcast. The pallete texture is created
+   programmatically in RAM, simulating a wormhole with radial distortion based
+   on distance and angle from the center, and then uploaded to VRAM for rendering.
+
+   The wormhole texture consists of grayscale colors ranging from white to dark
+   gray, while the background remains black. The colors in the wormhole are 
+   continuously cycled in the palette, creating the appearance of a swirling 
+   motion. The palette cycling is handled using a simple offset mechanism, 
+   where the wormholeâs color indices shift over time based on the current frame.
+
+   This effect demonstrates how to use 8-bit textures with dynamic palette 
+   animation, giving the appearance of a smoothly animated wormhole. The player
+   can press the START button on the controller to exit the demo.
+*/
+
+#include <stdlib.h>
+#include <math.h>
...<truncated>...


hooks/post-receive
-- 
A pseudo Operating System for the Dreamcast.


