void GLUtils::displayBasicText(const float x, const float y, std::string text)
{
// First we will allocate a buffer that will be used as our VBO for vertex data.
// Sean Barret says this will be ~270 bytes per character, so we will use 300 for good measure
GLuint rawBufferSize = text.length() * 300;
void *rawTextVertexBuffer = (void*)malloc(rawBufferSize);
// Call into the stb_easy_font code to get the vertex data for the given text
GLuint numQuadPrimitives = stb_easy_font_print(x, y, (char*)(text.c_str()), NULL, rawTextVertexBuffer, (int)rawBufferSize);
// Set everything up to draw (these bindings will have to be restored by the caller)
if (!s_textPipelineInitialized)
s_textPipelineInitialized = s_intitializeTextPipeline();
if (!s_textPipelineInitialized) return;
// Copy the data into the VBO
glBufferData(GL_ARRAY_BUFFER, rawBufferSize, rawTextVertexBuffer, GL_STREAM_DRAW);
// Set the color of the text via the uniform
GLuint uniColor = glGetUniformLocation(s_basicShaderProgram, "basicColor");
glUniform3f(uniColor, 1.0f, 0.0f, 0.0f);
// Draw the text
glDrawArrays(GL_QUADS, 0, 4 * numQuadPrimitives);
// Unset the pipeline flag because we assume other bindings will happen before this is called again
s_textPipelineInitialized = false;
}
void display_gl_text_render(display_gl_text_t* texts, mat4_t* projection_view)
{
int32 i;
int32 vb_index = 0;
v4_t color_diffuse;
v4_t color_ambient;
mat4_t local;
v4_set(&color_diffuse, 1.f, 1.f, 1.0f, 1.0f);
v4_set(&color_ambient, 0.0f, 0.0f, 0.0f, 0.0f);
mat4_ident(&local);
for (i = 0; i < texts->text_count; ++i)
{
t_text* text = &(texts->texts[i]);
vb_index += stb_easy_font_print(text->position.x,
text->position.y,
text->text,
(uint8*)&text->rgba,
texts->text_mesh_vb + vb_index,
texts->text_mesh_vb_size) * 64;
}
glDisable(GL_DEPTH_TEST);
glBindBuffer(GL_ARRAY_BUFFER, display_gl_mesh_get_vb(texts->text_mesh));
glBufferSubData(GL_ARRAY_BUFFER, 0, vb_index, texts->text_mesh_vb);
display_gl_mesh_render_start(texts->text_renderer, MESH_TYPE_VC);
display_gl_mesh_set_ambient(texts->text_renderer, &color_ambient);
display_gl_mesh_set_diffuse(texts->text_renderer, &color_diffuse);
display_gl_mesh_set_projection(texts->text_renderer, projection_view);
display_gl_mesh_set_local(texts->text_renderer, &local);
display_gl_mesh_render_count(texts->text_mesh, (vb_index / 64) * 6);
}
JNIEXPORT jint JNICALL Java_org_lwjgl_stb_STBEasyFont_nstb_1easy_1font_1print(JNIEnv *__env, jclass clazz, jfloat x, jfloat y, jlong textAddress, jlong colorAddress, jlong vertex_bufferAddress, jint vbuf_size) {
char *text = (char *)(intptr_t)textAddress;
unsigned char *color = (unsigned char *)(intptr_t)colorAddress;
void *vertex_buffer = (void *)(intptr_t)vertex_bufferAddress;
UNUSED_PARAMS(__env, clazz)
return (jint)stb_easy_font_print(x, y, text, color, vertex_buffer, vbuf_size);
}
inline void draw_text(int x, int y, const char * text)
{
char buffer[20000]; // ~100 chars
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(2, GL_FLOAT, 16, buffer);
glDrawArrays(GL_QUADS, 0, 4*stb_easy_font_print((float)x, (float)(y-7), (char *)text, nullptr, buffer, sizeof(buffer)));
glDisableClientState(GL_VERTEX_ARRAY);
}
static void print_string(float x, float y, char *text, float r, float g, float b)
{
static char buffer[99999];
int num_quads;
num_quads = stb_easy_font_print(x, y, text, NULL, buffer, sizeof(buffer));
glColor3f(r,g,b);
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(2, GL_FLOAT, 16, buffer);
glDrawArrays(GL_QUADS, 0, num_quads*4);
glDisableClientState(GL_VERTEX_ARRAY);
}
bool drawText(float x, float y, std::string text, Vector3 c, float scale )
{
static char buffer[99999]; // ~500 chars
int num_quads;
if (scale == 0)
return true;
x /= scale;
y /= scale;
if (Shader::current)
Shader::current->disable();
num_quads = stb_easy_font_print(x, y, (char*)(text.c_str()), NULL, buffer, sizeof(buffer));
Matrix44 projection_matrix;
projection_matrix.ortho(0, Game::instance->window_width / scale, Game::instance->window_height / scale, 0, -1, 1);
glDisable(GL_DEPTH_TEST);
glDisable(GL_CULL_FACE);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadMatrixf(Matrix44().m);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadMatrixf(projection_matrix.m);
glColor3f(c.x, c.y, c.z);
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(2, GL_FLOAT, 16, buffer);
glDrawArrays(GL_QUADS, 0, num_quads * 4);
glDisableClientState(GL_VERTEX_ARRAY);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
return true;
}
