nuclear@26: #include <math.h>
nuclear@26: #include "opengl.h"
nuclear@25: #include "camera.h"
nuclear@25: 
nuclear@26: static unsigned int tex;
nuclear@26: static float tex_matrix[] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1};
nuclear@26: 
nuclear@26: #define TESTPAT_WIDTH	256
nuclear@26: #define TESTPAT_HEIGHT	256
nuclear@26: 
nuclear@25: int cam_init(void *platform_data)
nuclear@25: {
nuclear@26: 	unsigned char pal[2][2][3] = {
nuclear@26: 		{{255, 128, 64}, {64, 128, 255}},
nuclear@26: 		{{128, 255, 64}, {128, 64, 255}}
nuclear@26: 	};
nuclear@26: 
nuclear@26: 	int i, j;
nuclear@26: 	unsigned char pixels[TESTPAT_WIDTH * TESTPAT_HEIGHT * 3];
nuclear@26: 	unsigned char *pptr = pixels;
nuclear@26: 
nuclear@26: 	for(i=0; i<TESTPAT_HEIGHT; i++) {
nuclear@26: 		for(j=0; j<TESTPAT_WIDTH; j++) {
nuclear@26: 			int chess = ((i >> 3) & 1) == ((j >> 3) & 1);
nuclear@26: 			float x = 2.0 * (float)j / (float)TESTPAT_WIDTH - 1.0;
nuclear@26: 			float y = 2.0 * (float)i / (float)TESTPAT_HEIGHT - 1.0;
nuclear@26: 			float len = sqrt(x * x + y * y);
nuclear@26: 			float wave = cos(len * 4.0 * M_PI);
nuclear@26: 			int band = wave >= 0 ? 0 : 1;
nuclear@26: 
nuclear@26: 			*pptr++ = pal[band][chess][0];
nuclear@26: 			*pptr++ = pal[band][chess][1];
nuclear@26: 			*pptr++ = pal[band][chess][2];
nuclear@26: 		}
nuclear@26: 	}
nuclear@26: 
nuclear@26: 	glGenTextures(1, &tex);
nuclear@26: 	glBindTexture(GL_TEXTURE_2D, tex);
nuclear@26: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@26: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@26: 	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, TESTPAT_WIDTH, TESTPAT_HEIGHT, 0, GL_RGB, GL_UNSIGNED_BYTE, pixels);
nuclear@26: 
nuclear@26: 	return 0;
nuclear@26: }
nuclear@26: 
nuclear@26: void cam_shutdown(void)
nuclear@26: {
nuclear@26: 	glDeleteTextures(1, &tex);
nuclear@26: }
nuclear@26: 
nuclear@26: unsigned int cam_texture(void)
nuclear@26: {
nuclear@26: 	return tex;
nuclear@26: }
nuclear@26: 
nuclear@26: const float *cam_texture_matrix(void)
nuclear@26: {
nuclear@26: 	return tex_matrix;
nuclear@26: }
nuclear@26: 
nuclear@26: int cam_start_video(void)
nuclear@26: {
nuclear@26: 	return 0;
nuclear@26: }
nuclear@26: 
nuclear@26: int cam_stop_video(void)
nuclear@26: {
nuclear@26: 	return 0;
nuclear@26: }
nuclear@26: 
nuclear@26: int cam_update(void)
nuclear@26: {
nuclear@26: 	return 0;
nuclear@26: }
nuclear@26: 
nuclear@26: int cam_is_capturing(void)
nuclear@26: {
nuclear@26: 	return 1;
nuclear@26: }
nuclear@26: 
nuclear@26: int cam_video_size(int *xsz, int *ysz)
nuclear@26: {
nuclear@26: 	*xsz = TESTPAT_WIDTH;
nuclear@26: 	*ysz = TESTPAT_HEIGHT;
nuclear@26: 	return 0;
nuclear@26: }
nuclear@26: 
nuclear@26: int cam_take_picture(void)
nuclear@26: {
nuclear@25: 	return -1;
nuclear@25: }
nuclear@25: 
nuclear@26: void cam_draw_preview(void)
nuclear@25: {
nuclear@26: 	glPushAttrib(GL_ENABLE_BIT);
nuclear@26: 	glDisable(GL_DEPTH_TEST);
nuclear@26: 	glDisable(GL_LIGHTING);
nuclear@26: 	glEnable(GL_TEXTURE_2D);
nuclear@26: 	glDisable(GL_BLEND);
nuclear@26: 
nuclear@26: 	glUseProgram(0);
nuclear@26: 
nuclear@26: 	glBindTexture(GL_TEXTURE_2D, tex);
nuclear@26: 
nuclear@26: 	glBegin(GL_QUADS);
nuclear@26: 	glTexCoord2f(0, 0);
nuclear@26: 	glVertex2f(-1, -1);
nuclear@26: 	glTexCoord2f(1, 0);
nuclear@26: 	glVertex2f(1, -1);
nuclear@26: 	glTexCoord2f(1, 1);
nuclear@26: 	glVertex2f(1, 1);
nuclear@26: 	glTexCoord2f(0, 1);
nuclear@26: 	glVertex2f(-1, 1);
nuclear@26: 	glEnd();
nuclear@26: 
nuclear@26: 	glPopAttrib();
nuclear@25: }