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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5098 | clevermous | 1 | #include "zgl.h" |
| 2 | #include "msghandling.h" |
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| 3 | #include |
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| 4 | #include |
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| 5 | |||
| 6 | static void calc_buf(GLSpecBuf *buf, const float shininess) |
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| 7 | { |
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| 8 | int i; |
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| 9 | float val, inc; |
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| 10 | val = 0.0f; |
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| 11 | inc = 1.0f/SPECULAR_BUFFER_SIZE; |
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| 12 | for (i = 0; i <= SPECULAR_BUFFER_SIZE; i++) { |
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| 13 | buf->buf[i] = pow(val, shininess); |
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| 14 | val += inc; |
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| 15 | } |
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| 16 | } |
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| 17 | |||
| 18 | GLSpecBuf * |
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| 19 | specbuf_get_buffer(GLContext *c, const int shininess_i, |
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| 20 | const float shininess) |
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| 21 | { |
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| 22 | GLSpecBuf *found, *oldest; |
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| 23 | found = oldest = c->specbuf_first; |
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| 24 | while (found && found->shininess_i != shininess_i) { |
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| 25 | if (found->last_used < oldest->last_used) { |
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| 26 | oldest = found; |
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| 27 | } |
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| 28 | found = found->next; |
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| 29 | } |
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| 30 | if (found) { /* hey, found one! */ |
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| 31 | found->last_used = c->specbuf_used_counter++; |
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| 32 | return found; |
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| 33 | } |
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| 34 | if (oldest == NULL || c->specbuf_num_buffers < MAX_SPECULAR_BUFFERS) { |
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| 35 | /* create new buffer */ |
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| 36 | GLSpecBuf *buf = gl_malloc(sizeof(GLSpecBuf)); |
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| 37 | if (!buf) gl_fatal_error("could not allocate specular buffer"); |
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| 38 | c->specbuf_num_buffers++; |
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| 39 | buf->next = c->specbuf_first; |
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| 40 | c->specbuf_first = buf; |
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| 41 | buf->last_used = c->specbuf_used_counter++; |
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| 42 | buf->shininess_i = shininess_i; |
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| 43 | calc_buf(buf, shininess); |
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| 44 | return buf; |
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| 45 | } |
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| 46 | /* overwrite the lru buffer */ |
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| 47 | /*tgl_trace("overwriting spec buffer :(\n");*/ |
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| 48 | oldest->shininess_i = shininess_i; |
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| 49 | oldest->last_used = c->specbuf_used_counter++; |
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| 50 | calc_buf(oldest, shininess); |
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| 51 | return oldest; |
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| 52 | } |