79 lines
2 KiB
C
79 lines
2 KiB
C
#include <af_common.h>
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#include <stb_image.h>
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static GLuint font_atlas;
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static int font_width = 0, font_height = 0;
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void gl_font_init(void) {
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unsigned int ch;
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unsigned char* data = stbi_load(DATAROOTDIR "/assaultfish/font.png", &font_width, &font_height, &ch, 4);
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glGenTextures(1, &font_atlas);
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glBindTexture(GL_TEXTURE_2D, font_atlas);
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if(data != NULL) {
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, font_width, font_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
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free(data);
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}
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glBindTexture(GL_TEXTURE_2D, 0);
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}
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void gl_font_text(const char* text, int x, int y, double scale) {
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int i;
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int gw = font_width / 16 * scale, gh = font_height / 16 * scale;
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int is = glIsEnabled(GL_TEXTURE_2D) ? 1 : 0;
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glDisable(GL_DEPTH_TEST);
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glDisable(GL_LIGHTING);
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glDisable(GL_CULL_FACE);
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if(!is) glEnable(GL_TEXTURE_2D);
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glBindTexture(GL_TEXTURE_2D, font_atlas);
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glMatrixMode(GL_PROJECTION);
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glPushMatrix();
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glLoadIdentity();
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glOrtho(0, MwGetInteger(opengl, MwNwidth), MwGetInteger(opengl, MwNheight), 0, -1, 1);
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glMatrixMode(GL_MODELVIEW);
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glPushMatrix();
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glLoadIdentity();
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glBegin(GL_QUADS);
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for(i = 0; text[i] != 0; i++) {
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double bx = 1.0 / 16 * (text[i] % 16), by = 1.0 / 16 * (text[i] / 16);
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glTexCoord2f(bx, by);
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glVertex2f(i * gw + x, y);
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glTexCoord2f(bx + 1.0 / 16, by);
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glVertex2f(i * gw + x + gw, y);
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glTexCoord2f(bx + 1.0 / 16, by + 1.0 / 16);
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glVertex2f(i * gw + x + gw, y + gh);
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glTexCoord2f(bx, by + 1.0 / 16);
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glVertex2f(i * gw + x, y + gh);
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}
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glEnd();
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glMatrixMode(GL_MODELVIEW);
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glPopMatrix();
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glMatrixMode(GL_PROJECTION);
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glPopMatrix();
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glMatrixMode(GL_MODELVIEW);
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glBindTexture(GL_TEXTURE_2D, 0);
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if(!is) glEnable(GL_TEXTURE_2D);
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glEnable(GL_CULL_FACE);
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glEnable(GL_LIGHTING);
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glEnable(GL_DEPTH_TEST);
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}
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int gl_font_width(const char* text) {
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return font_width / 16 * strlen(text);
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}
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int gl_font_height(const char* text) {
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return font_height / 16;
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}
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