#368 GBA clearFB_asm + sndClear_asm instead of DMA fill, increase fog distance (2 blocks)

src/fixed/common.cpp

@@ -29,10 +29,6 @@ EWRAM_DATA const char* const* STR = STR_EN;
 
 EWRAM_DATA ExtraInfoLara playersExtra[MAX_PLAYERS];
 
-#if defined(USE_VRAM_MESH) || defined(USE_VRAM_ROOM)
-uint8* vramPtr = (uint8*)0x06014000;
-#endif
-
 #if defined(__GBA__)
     #include "TRACKS_IMA.h"
     #include "TITLE_SCR.h"

src/fixed/common.h

@@ -462,7 +462,7 @@ extern uint8* vramPtr;
 #define FOV_SHIFT       3
 #define FOG_SHIFT       1
 #define FOG_MAX         VIEW_DIST
-#define FOG_MIN         (FOG_MAX - 4096)
+#define FOG_MIN         (FOG_MAX - 2048)
 #define VIEW_MIN_F      (64 << FIXED_SHIFT)
 #define VIEW_MAX_F      (VIEW_DIST << FIXED_SHIFT)
 

src/fixed/level.h

@@ -189,6 +189,7 @@ void readLevel(const uint8* data)
 
 #ifdef USE_VRAM_MESH // experimental, should be per level or dynamic
     vramMeshesCount = 0;
+    vramPtr = (uint8*)0x06014000;
     vramPtr = pushToVRAM(vramPtr, models + ITEM_LARA);
     vramPtr = pushToVRAM(vramPtr, models + ITEM_LARA_PISTOLS);
     vramPtr = pushToVRAM(vramPtr, models + ITEM_LARA_SHOTGUN);

src/platform/gba/asm/clearFB.s

@@ -0,0 +1,43 @@
+#include "common_asm.inc"
+
+dst .req r0     // arg
+end .req r14
+
+.global clearFB_asm
+clearFB_asm:
+    stmfd sp!, {r4-r6}
+    fiq_on
+
+    // 12 words
+    mov r1, #0
+    mov r2, #0
+    mov r3, #0
+    mov r4, #0
+    mov r5, #0
+    mov r6, #0
+    // FIQ regs
+    mov r8, #0
+    mov r9, #0
+    mov r10, #0
+    mov r11, #0
+    mov r12, #0
+    mov r13, #0
+    add end, dst, #(FRAME_WIDTH * FRAME_HEIGHT)
+
+.loop:
+    // fill 12 * 4 * 8 bytes per iteration
+    stmia dst!, {r1-r6, r8-r13}
+    stmia dst!, {r1-r6, r8-r13}
+    stmia dst!, {r1-r6, r8-r13}
+    stmia dst!, {r1-r6, r8-r13}
+    stmia dst!, {r1-r6, r8-r13}
+    stmia dst!, {r1-r6, r8-r13}
+    stmia dst!, {r1-r6, r8-r13}
+    stmia dst!, {r1-r6, r8-r13}
+
+    cmp dst, end
+    blt .loop
+
+    fiq_off
+    ldmfd sp!, {r4-r6}
+    bx lr

src/platform/gba/asm/common_asm.inc

@@ -77,7 +77,7 @@
 .equ VIEW_MAX,      (10 << 10)
 .equ VIEW_OFF,      4096
 .equ FOG_SHIFT,     4
-.equ FOG_MIN,       (VIEW_MAX - 4096)
+.equ FOG_MIN,       (VIEW_MAX - 2048)
 
 .equ OT_SHIFT,      4
 .equ OT_SIZE,       ((VIEW_MAX >> OT_SHIFT) + 1)

src/platform/gba/asm/sndPCM.s

@@ -91,3 +91,26 @@ sndPCM_mix_asm:
 
     ldmfd sp!, {r4-r6}
     bx lr
+
+.global sndClear_asm
+sndClear_asm:
+    // 4 words
+    mov r1, #0
+    mov r2, #0
+    mov r3, #0
+    mov r12, #0
+
+    // fill 11 * 4 * 4 = 176 bytes
+    stmia r0!, {r1-r3, r12}
+    stmia r0!, {r1-r3, r12}
+    stmia r0!, {r1-r3, r12}
+    stmia r0!, {r1-r3, r12}
+    stmia r0!, {r1-r3, r12}
+    stmia r0!, {r1-r3, r12}
+    stmia r0!, {r1-r3, r12}
+    stmia r0!, {r1-r3, r12}
+    stmia r0!, {r1-r3, r12}
+    stmia r0!, {r1-r3, r12}
+    stmia r0!, {r1-r3, r12}
+
+    bx lr

src/platform/gba/render.iwram.cpp

@@ -70,6 +70,10 @@ Face* gOT[OT_SIZE];                                             // IWRAM 2.5k
 Vertex* gVerticesBase = gVertices;
 Face* gFacesBase = gFaces;
 
+#if defined(USE_VRAM_MESH) || defined(USE_VRAM_ROOM)
+uint8* vramPtr;
+#endif
+
 enum ClipFlags {
     CLIP_LEFT    = 1 << 0,
     CLIP_RIGHT   = 1 << 1,
@@ -129,6 +133,7 @@ extern "C" {
     #define faceAddMeshQuads        faceAddMeshQuads_asm
     #define faceAddMeshTriangles    faceAddMeshTriangles_asm
     #define rasterize               rasterize_asm
+    #define clearFB                 clearFB_asm
 
     extern "C" {
         void transformRoom_asm(const RoomVertex* vertices, int32 count);
@@ -139,6 +144,7 @@ extern "C" {
         void faceAddMeshQuads_asm(const MeshQuad* polys, int32 count);
         void faceAddMeshTriangles_asm(const MeshTriangle* polys, int32 count);
         void rasterize_asm(uint32 flags, VertexLink* top);
+        void clearFB_asm(void* fb);
     }
 #else
     #define transformRoom           transformRoom_c
@@ -149,6 +155,7 @@ extern "C" {
     #define faceAddMeshQuads        faceAddMeshQuads_c
     #define faceAddMeshTriangles    faceAddMeshTriangles_c
     #define rasterize               rasterize_c
+    #define clearFB(fb)             dmaFill(fb, 0, FRAME_WIDTH * FRAME_HEIGHT)
 
 X_INLINE bool checkBackface(const Vertex* a, const Vertex* b, const Vertex* c)
 {
@@ -805,7 +812,7 @@ void faceAddMesh(const MeshQuad* quads, const MeshTriangle* triangles, int32 qCo
 
 void clear()
 {
-    dmaFill((void*)fb, 0, FRAME_WIDTH * FRAME_HEIGHT);
+    clearFB((void*)fb);
 }
 
 void renderRoom(Room* room)

src/platform/gba/sound.cpp

@@ -27,8 +27,10 @@ int8 soundBuffer[2 * SND_SAMPLES + 32]; // 32 bytes of silence for DMA overrun w
     #define sndIMA_fill sndIMA_fill_asm
     #define sndPCM_fill sndPCM_fill_asm
     #define sndPCM_mix  sndPCM_mix_asm
+    #define sndClear    sndClear_asm
 
     extern "C" {
+        void sndClear_asm(int8* buffer);
         void sndIMA_fill_asm(IMA_STATE &state, int8* buffer, const uint8* data, int32 size);
         int32 sndPCM_fill_asm(int32 pos, int32 inc, int32 size, int32 volume, const uint8* data, int8* buffer);
         int32 sndPCM_mix_asm(int32 pos, int32 inc, int32 size, int32 volume, const uint8* data, int8* buffer);
@@ -37,6 +39,7 @@ int8 soundBuffer[2 * SND_SAMPLES + 32]; // 32 bytes of silence for DMA overrun w
     #define sndIMA_fill sndIMA_c
     #define sndPCM_fill sndPCM_c
     #define sndPCM_mix  sndPCM_c
+    #define sndClear(b) dmaFill(b, SND_ENCODE(0), SND_SAMPLES * sizeof(b[0]))
 
 #define DECODE_IMA_4(n)\
     step = IMA_STEP[idx];\
@@ -286,7 +289,7 @@ void sndFill(int8* buffer)
     if (mix) {
         music.fill(buffer);
     } else {
-        dmaFill(buffer, SND_ENCODE(0), SND_SAMPLES * sizeof(buffer[0]));
+        sndClear(buffer);
     }
 
     int32 ch = channelsCount;