/**
* @brief Upload data to a sub-position in already-created buffer. You could also use this function to
* resize an existing buffer without uploading data, although it won't make the
* buffer smaller.
* @param data_offset Whether the data pointer should be offset by start or not.
*/
void R_UploadToSubBuffer(r_buffer_t *buffer, const size_t start, const size_t size, const void *data,
const _Bool data_offset) {
assert(buffer->bufnum != 0);
// Check size. This is benign really, but it's usually a bug.
if (!size) {
Com_Warn("Attempted to upload 0 bytes to GPU\n");
return;
}
// Don't allow null ptrs since bufferSubData does not allow it.
if (!data) {
Com_Error(ERROR_DROP, "Fatal: attempted to upload null to GPU. bufferSubData does not allow this.\n");
}
// offset ptr if requested
if (start && data && data_offset) {
data += start;
}
R_BindBuffer(buffer);
// if the buffer isn't big enough to hold what we had already,
// we have to resize the buffer
const size_t total_size = start + size;
if (total_size > buffer->size) {
// if we passed a "start", the data is offset, so
// just reset to null. This is an odd edge case and
// it's fairly rare you'll be editing at the end first,
// but who knows.
if (start) {
glBufferData(buffer->target, total_size, NULL, buffer->hint);
R_GetError("Partial resize");
r_view.buffer_stats[buffer->type].num_full_uploads++;
glBufferSubData(buffer->target, start, size, data);
R_GetError("Partial update");
r_view.buffer_stats[buffer->type].num_partial_uploads++;
} else {
glBufferData(buffer->target, total_size, data, buffer->hint);
R_GetError("Full resize");
r_view.buffer_stats[buffer->type].num_full_uploads++;
}
r_state.buffers_total_bytes -= buffer->size;
r_state.buffers_total_bytes += total_size;
buffer->size = total_size;
} else {
// just update the range we specified
glBufferSubData(buffer->target, start, size, data);
R_GetError("Updating existing buffer");
r_view.buffer_stats[buffer->type].num_partial_uploads++;
}
r_view.buffer_stats[buffer->type].size_uploaded += size;
}
/*
* @brief
*/
static void R_SetVertexBufferState(const r_model_t *mod, uint32_t mask) {
// vertex array
if (mask & R_ARRAY_VERTEX)
R_BindBuffer(GL_VERTEX_ARRAY, GL_FLOAT, mod->vertex_buffer);
// normals and tangents
if (r_state.lighting_enabled) {
if (mask & R_ARRAY_NORMAL)
R_BindBuffer(GL_NORMAL_ARRAY, GL_FLOAT, mod->normal_buffer);
if (r_bumpmap->value) {
if ((mask & R_ARRAY_TANGENT) && mod->tangent_buffer)
R_BindBuffer(GL_TANGENT_ARRAY, GL_FLOAT, mod->tangent_buffer);
}
}
// diffuse texcoords
if (texunit_diffuse.enabled) {
if (mask & R_ARRAY_TEX_DIFFUSE)
R_BindBuffer(GL_TEXTURE_COORD_ARRAY, GL_FLOAT, mod->texcoord_buffer);
}
// lightmap texcoords
if (texunit_lightmap.enabled) {
if (mask & R_ARRAY_TEX_LIGHTMAP) {
R_SelectTexture(&texunit_lightmap);
R_BindBuffer(GL_TEXTURE_COORD_ARRAY, GL_FLOAT, mod->lightmap_texcoord_buffer);
R_SelectTexture(&texunit_diffuse);
}
}
}
/**
* @brief Upload data to an already-created buffer. You could also use this function to
* resize an existing buffer without uploading data, although it won't make the
* buffer smaller.
*/
void R_UploadToBuffer(r_buffer_t *buffer, const size_t size, const void *data) {
assert(buffer->bufnum != 0);
// Check size. This is benign really, but it's usually a bug.
if (!size) {
Com_Warn("Attempted to upload 0 bytes to GPU");
return;
}
R_BindBuffer(buffer);
// if the buffer isn't big enough to hold what we had already,
// we have to resize the buffer
if (size > buffer->size) {
r_state.buffers_total_bytes -= buffer->size;
r_state.buffers_total_bytes += size;
glBufferData(buffer->target, size, data, buffer->hint);
R_GetError("Full resize");
r_view.buffer_stats[buffer->type].num_full_uploads++;
buffer->size = size;
} else {
// just update the range we specified
if (data) {
glBufferSubData(buffer->target, 0, size, data);
r_view.buffer_stats[buffer->type].num_partial_uploads++;
R_GetError("Updating existing buffer");
}
}
r_view.buffer_stats[buffer->type].size_uploaded += size;
}
/*
* @brief
*/
void R_ResetArrayState(void) {
uint32_t arrays, mask;
mask = 0xffff, arrays = R_ArraysMask(); // resolve the desired arrays mask
if (r_array_state.model == NULL) {
const int32_t xor = r_array_state.arrays ^ arrays;
if (!xor) // no changes, we're done
return;
// resolve what's left to turn on
mask = arrays & xor;
} else
// vbo
R_BindBuffer(0, 0, 0);
// vertex array
if (mask & R_ARRAY_VERTEX)
R_BindDefaultArray(GL_VERTEX_ARRAY);
// color array
if (r_state.color_array_enabled) {
if (mask & R_ARRAY_COLOR)
R_BindDefaultArray(GL_COLOR_ARRAY);
}
// normals and tangents
if (r_state.lighting_enabled) {
if (mask & R_ARRAY_NORMAL)
R_BindDefaultArray(GL_NORMAL_ARRAY);
if (r_bumpmap->value) {
if (mask & R_ARRAY_TANGENT)
R_BindDefaultArray(GL_TANGENT_ARRAY);
}
}
// diffuse texcoords
if (texunit_diffuse.enabled) {
if (mask & R_ARRAY_TEX_DIFFUSE)
R_BindDefaultArray(GL_TEXTURE_COORD_ARRAY);
}
// lightmap texcoords
if (texunit_lightmap.enabled) {
if (mask & R_ARRAY_TEX_LIGHTMAP) {
R_SelectTexture(&texunit_lightmap);
R_BindDefaultArray(GL_TEXTURE_COORD_ARRAY);
R_SelectTexture(&texunit_diffuse);
}
}
r_array_state.model = NULL;
r_array_state.arrays = arrays;
}