nuclear@5: #include <string.h>
nuclear@5: #include <errno.h>
nuclear@16: #include <assert.h>
nuclear@5: 
nuclear@0: #ifndef __APPLE__
nuclear@5: #ifdef WIN32
nuclear@5: #include <windows.h>
nuclear@5: #endif
nuclear@5: 
nuclear@0: #include <GL/gl.h>
nuclear@0: #else
nuclear@0: #include <OpenGL/gl.h>
nuclear@0: #endif
nuclear@0: 
nuclear@5: #include <imago2.h>
nuclear@5: #include "psys.h"
nuclear@5: #include "psys_gl.h"
nuclear@0: 
nuclear@0: void psys_gl_draw_start(struct psys_emitter *em, void *cls)
nuclear@0: {
nuclear@0: 	glPushAttrib(GL_ENABLE_BIT);
nuclear@0: 	glDisable(GL_LIGHTING);
nuclear@0: 
nuclear@2: 	glEnable(GL_BLEND);
nuclear@3: 	glBlendFunc(GL_SRC_ALPHA, GL_ONE);
nuclear@2: 
nuclear@5: 	if(em->attr.tex) {
nuclear@2: 		glEnable(GL_TEXTURE_2D);
nuclear@5: 		glBindTexture(GL_TEXTURE_2D, em->attr.tex);
nuclear@2: 	}
nuclear@2: 
nuclear@0: 	glDepthMask(0);
nuclear@0: }
nuclear@0: 
nuclear@0: void psys_gl_draw(struct psys_emitter *em, struct psys_particle *p, void *cls)
nuclear@0: {
nuclear@0: 	float hsz = p->size / 2.0;
nuclear@0: 
nuclear@20: 	float xform[16];
nuclear@20: 
nuclear@20: 	glMatrixMode(GL_MODELVIEW);
nuclear@20: 	glPushMatrix();
nuclear@20: 
nuclear@20: 	glTranslatef(p->pos.x, p->pos.y, p->pos.z);
nuclear@20: 
nuclear@20: 	glGetFloatv(GL_MODELVIEW_MATRIX, xform);
nuclear@20: 	xform[0] = xform[5] = xform[10] = 1.0;
nuclear@20: 	xform[1] = xform[2] = xform[4] = xform[6] = xform[8] = xform[9] = 0.0;
nuclear@20: 	glLoadMatrixf(xform);
nuclear@20: 
nuclear@20: 	glBegin(GL_QUADS);
nuclear@9: 	glColor4f(p->color.x, p->color.y, p->color.z, p->alpha);
nuclear@9: 
nuclear@0: 	glTexCoord2f(0, 0);
nuclear@20: 	glVertex2f(-hsz, -hsz);
nuclear@0: 
nuclear@0: 	glTexCoord2f(1, 0);
nuclear@20: 	glVertex2f(hsz, -hsz);
nuclear@0: 
nuclear@0: 	glTexCoord2f(1, 1);
nuclear@20: 	glVertex2f(hsz, hsz);
nuclear@0: 
nuclear@0: 	glTexCoord2f(0, 1);
nuclear@20: 	glVertex2f(-hsz, hsz);
nuclear@20: 	glEnd();
nuclear@20: 
nuclear@20: 	glMatrixMode(GL_MODELVIEW);
nuclear@20: 	glPopMatrix();
nuclear@0: }
nuclear@0: 
nuclear@0: void psys_gl_draw_end(struct psys_emitter *em, void *cls)
nuclear@0: {
nuclear@0: 	glDepthMask(1);
nuclear@0: 	glPopAttrib();
nuclear@0: }
nuclear@5: 
nuclear@5: 
nuclear@5: unsigned int psys_gl_load_texture(const char *fname, void *cls)
nuclear@5: {
nuclear@5: 	unsigned int tex;
nuclear@5: 	void *pixels;
nuclear@5: 	int xsz, ysz;
nuclear@5: 
nuclear@5: 	if(!(pixels = img_load_pixels(fname, &xsz, &ysz, IMG_FMT_RGBA32))) {
nuclear@5: 		return 0;
nuclear@5: 	}
nuclear@16: 	printf("%s: creating texture %s (%dx%d)\n", __func__, fname, xsz, ysz);
nuclear@5: 
nuclear@5: 	glGenTextures(1, &tex);
nuclear@5: 	glBindTexture(GL_TEXTURE_2D, tex);
nuclear@5: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@5: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@5: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
nuclear@5: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
nuclear@16: 	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, xsz, ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
nuclear@16: 
nuclear@16: 	assert(glGetError() == GL_NO_ERROR);
nuclear@5: 
nuclear@5: 	img_free_pixels(pixels);
nuclear@5: 	return tex;
nuclear@5: }
nuclear@5: 
nuclear@5: void psys_gl_unload_texture(unsigned int tex, void *cls)
nuclear@5: {
nuclear@5: 	glDeleteTextures(1, &tex);
nuclear@5: }