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Move to a dynamically resizing vertex buffer

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This commit is contained in:
Luke Benstead 2017-09-15 13:09:48 +01:00
parent 95b71c8291
commit 100e6980a5
1 changed files with 39 additions and 6 deletions
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45
gl-pvr.c
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@ -33,11 +33,14 @@
/* Vertex Buffer Functions *************************************************************************/
#define COMMANDS_PER_ALLOC ((64 * 1024) / 32) /* 64k memory chunks */
static pvr_cmd_t *GL_VBUF[2] __attribute__((aligned(32))); /* Dynamic Vertex Buffer */
static pvr_cmd_t *GL_CBUF; /* Dynamic Clip Buffer */
static glTexCoord *GL_UVBUF; /* Dynamic Multi-Texture UV */
static GLuint GL_VERTS[2] = {0, 0};
static GLuint GL_VERTS_ALLOCATED[2] = {0, 0};
static GLuint GL_CVERTS = 0;
static GLuint GL_UVVERTS = 0;
static GLuint GL_LIST = GL_KOS_LIST_OP;
@ -157,8 +160,32 @@ inline void *_glKosVertexBufPointer() {
return &GL_VBUF[GL_LIST][GL_VERTS[GL_LIST]];
}
static void _glKosVertexBufIncrementList(GLubyte list, GLuint count) {
GL_VERTS[list] += count;
if(GL_VERTS[list] > GL_VERTS_ALLOCATED[list]) {
/* Grow the list buffer. We can't use realloc with memalign so we have to memcpy */
pvr_cmd_t* orig = GL_VBUF[list];
/* Increase the allocated counter */
GL_VERTS_ALLOCATED[list] += COMMANDS_PER_ALLOC;
/* Create a new memory buffer with the new size */
GL_VBUF[list] = memalign(
0x20,
GL_VERTS_ALLOCATED[list] * sizeof(pvr_cmd_t)
);
/* Copy across the original data */
memcpy(GL_VBUF[list], orig, (GL_VERTS[list] - count) * sizeof(pvr_cmd_t));
/* Free previously allocated memory */
free(orig);
}
}
inline void _glKosVertexBufIncrement() {
++GL_VERTS[GL_LIST];
_glKosVertexBufIncrementList(GL_LIST, 1);
}
inline void *_glKosTRVertexBufPointer() {
@ -166,18 +193,19 @@ inline void *_glKosTRVertexBufPointer() {
}
inline void _glKosTRVertexBufIncrement() {
++GL_VERTS[GL_KOS_LIST_TR];
_glKosVertexBufIncrementList(GL_KOS_LIST_TR, 1);
}
inline void _glKosVertexBufAdd(GLuint count) {
GL_VERTS[GL_LIST] += count;
_glKosVertexBufIncrementList(GL_LIST, count);
}
inline void _glKosTRVertexBufAdd(GLuint count) {
GL_VERTS[GL_KOS_LIST_TR] += count;
_glKosVertexBufIncrementList(GL_KOS_LIST_TR, count);
}
inline void _glKosVertexBufDecrement() {
/* Intentionally don't free data here, we only ever grow */
--GL_VERTS[GL_LIST];
}
@ -281,6 +309,8 @@ void glutCopyBufferToTexture(void *dst, GLsizei *x, GLsizei *y) {
}
int _glKosInitPVR() {
GLubyte i;
pvr_init_params_t params = {
/* Enable opaque and translucent polygons with size 32 and 32 */
@ -296,8 +326,11 @@ int _glKosInitPVR() {
pvr_init(&params);
GL_VBUF[0] = memalign(0x20, GL_KOS_MAX_VERTS * sizeof(pvr_cmd_t));
GL_VBUF[1] = memalign(0x20, GL_KOS_MAX_VERTS * sizeof(pvr_cmd_t));
for(i = 0; i < 2; ++i) {
GL_VBUF[i] = memalign(0x20, COMMANDS_PER_ALLOC * sizeof(pvr_cmd_t));
GL_VERTS_ALLOCATED[i] = COMMANDS_PER_ALLOC;
}
GL_CBUF = malloc((GL_KOS_MAX_VERTS / 2) * sizeof(pvr_cmd_t));
GL_UVBUF = malloc(GL_KOS_MAX_VERTS * sizeof(glTexCoord));