70 lines
2.0 KiB
C
Executable File
70 lines
2.0 KiB
C
Executable File
#include "line.h"
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GLint stippleFactor = 1;
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GLushort stipplePattern = 0xFFFF;
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GLubyte *stippleData = NULL;
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GLuint stippleTexture = 0;
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void glshim_glLineStipple(GLuint factor, GLushort pattern) {
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stippleFactor = factor;
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stipplePattern = pattern;
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if (stippleData != NULL) {
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free(stippleData);
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}
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stippleData = (GLubyte *)malloc(sizeof(GLubyte) * 16);
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for (int i = 0; i < 16; i++) {
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stippleData[i] = (stipplePattern >> i) & 1 ? 255 : 0;
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}
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glshim_glPushAttrib(GL_TEXTURE_BIT);
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if (! stippleTexture)
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glshim_glGenTextures(1, &stippleTexture);
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glshim_glBindTexture(GL_TEXTURE_2D, stippleTexture);
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glshim_glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
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glshim_glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glshim_glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glshim_glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA,
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16, 1, 0, GL_ALPHA, GL_UNSIGNED_BYTE, stippleData);
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glshim_glPopAttrib();
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noerrorShim();
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}
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void glLineStipple(GLuint factor, GLushort pattern) AliasExport("glshim_glLineStipple");
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void bind_stipple_tex() {
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glshim_glBindTexture(GL_TEXTURE_2D, stippleTexture);
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}
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GLfloat *gen_stipple_tex_coords(GLfloat *vert, int length) {
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// generate our texture coords
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GLfloat *tex = (GLfloat *)malloc(length * 4 * sizeof(GLfloat));
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GLfloat *texPos = tex;
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GLfloat *vertPos = vert;
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GLfloat x1, x2, y1, y2;
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GLfloat len;
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for (int i = 0; i < length / 2; i++) {
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x1 = *vertPos++;
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y1 = *vertPos++;
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vertPos++; // z
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vertPos++; // w
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x2 = *vertPos++;
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y2 = *vertPos++;
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vertPos++;
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vertPos++;
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len = sqrtf(powf(x2-x1, 2) + powf(y2-y1, 2)) / stippleFactor * 16;
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*texPos++ = 0;
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*texPos++ = 0;
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*texPos++ = 0;
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*texPos++ = 1;
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*texPos++ = len;
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*texPos++ = 0;
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*texPos++ = 0;
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*texPos++ = 1;
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}
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return tex;
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}
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