1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/prototype/psys/psys_gl.c	Sun Oct 07 02:04:00 2012 +0300
     1.3 @@ -0,0 +1,106 @@
     1.4 +#include <string.h>
     1.5 +#include <errno.h>
     1.6 +#include <assert.h>
     1.7 +
     1.8 +#ifndef __APPLE__
     1.9 +#ifdef WIN32
    1.10 +#include <windows.h>
    1.11 +#endif
    1.12 +
    1.13 +#include <GL/gl.h>
    1.14 +#else
    1.15 +#include <OpenGL/gl.h>
    1.16 +#endif
    1.17 +
    1.18 +#include <imago2.h>
    1.19 +#include "psys.h"
    1.20 +#include "psys_gl.h"
    1.21 +
    1.22 +void psys_gl_draw_start(struct psys_emitter *em, void *cls)
    1.23 +{
    1.24 +	glPushAttrib(GL_ENABLE_BIT);
    1.25 +	glDisable(GL_LIGHTING);
    1.26 +
    1.27 +	glEnable(GL_BLEND);
    1.28 +	glBlendFunc(GL_SRC_ALPHA, GL_ONE);
    1.29 +
    1.30 +	if(em->attr.tex) {
    1.31 +		glEnable(GL_TEXTURE_2D);
    1.32 +		glBindTexture(GL_TEXTURE_2D, em->attr.tex);
    1.33 +	}
    1.34 +
    1.35 +	glDepthMask(0);
    1.36 +}
    1.37 +
    1.38 +void psys_gl_draw(struct psys_emitter *em, struct psys_particle *p, void *cls)
    1.39 +{
    1.40 +	float hsz = p->size / 2.0;
    1.41 +
    1.42 +	float xform[16];
    1.43 +
    1.44 +	glMatrixMode(GL_MODELVIEW);
    1.45 +	glPushMatrix();
    1.46 +
    1.47 +	glTranslatef(p->pos.x, p->pos.y, p->pos.z);
    1.48 +
    1.49 +	glGetFloatv(GL_MODELVIEW_MATRIX, xform);
    1.50 +	xform[0] = xform[5] = xform[10] = 1.0;
    1.51 +	xform[1] = xform[2] = xform[4] = xform[6] = xform[8] = xform[9] = 0.0;
    1.52 +	glLoadMatrixf(xform);
    1.53 +
    1.54 +	glBegin(GL_QUADS);
    1.55 +	glColor4f(p->color.x, p->color.y, p->color.z, p->alpha);
    1.56 +
    1.57 +	glTexCoord2f(0, 0);
    1.58 +	glVertex2f(-hsz, -hsz);
    1.59 +
    1.60 +	glTexCoord2f(1, 0);
    1.61 +	glVertex2f(hsz, -hsz);
    1.62 +
    1.63 +	glTexCoord2f(1, 1);
    1.64 +	glVertex2f(hsz, hsz);
    1.65 +
    1.66 +	glTexCoord2f(0, 1);
    1.67 +	glVertex2f(-hsz, hsz);
    1.68 +	glEnd();
    1.69 +
    1.70 +	glMatrixMode(GL_MODELVIEW);
    1.71 +	glPopMatrix();
    1.72 +}
    1.73 +
    1.74 +void psys_gl_draw_end(struct psys_emitter *em, void *cls)
    1.75 +{
    1.76 +	glDepthMask(1);
    1.77 +	glPopAttrib();
    1.78 +}
    1.79 +
    1.80 +
    1.81 +unsigned int psys_gl_load_texture(const char *fname, void *cls)
    1.82 +{
    1.83 +	unsigned int tex;
    1.84 +	void *pixels;
    1.85 +	int xsz, ysz;
    1.86 +
    1.87 +	if(!(pixels = img_load_pixels(fname, &xsz, &ysz, IMG_FMT_RGBA32))) {
    1.88 +		return 0;
    1.89 +	}
    1.90 +	printf("%s: creating texture %s (%dx%d)\n", __func__, fname, xsz, ysz);
    1.91 +
    1.92 +	glGenTextures(1, &tex);
    1.93 +	glBindTexture(GL_TEXTURE_2D, tex);
    1.94 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    1.95 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    1.96 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
    1.97 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
    1.98 +	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, xsz, ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
    1.99 +
   1.100 +	assert(glGetError() == GL_NO_ERROR);
   1.101 +
   1.102 +	img_free_pixels(pixels);
   1.103 +	return tex;
   1.104 +}
   1.105 +
   1.106 +void psys_gl_unload_texture(unsigned int tex, void *cls)
   1.107 +{
   1.108 +	glDeleteTextures(1, &tex);
   1.109 +}