/**
* @name context_2d_fillText
* @brief fills text on the given context using given options
* @param ctx - (context_2d *) ctx to fill text on
* @param img - (texture_2d *) bitmap font texture to use
* @param srcRect - (const rect_2d *) source rectangle on the texture to draw from
* @param destRect - (const rect_2d *) destination rect to draw to
* @param alpha - (float) alpha to draw with
* @param composite_op - (int) composite operation to draw with
* @retval NONE
*/
void context_2d_fillText(context_2d *ctx, texture_2d *img, const rect_2d *srcRect, const rect_2d *destRect, float alpha) {
context_2d_bind(ctx);
if (img && img->loaded) {
draw_textures_item(ctx, GET_MODEL_VIEW_MATRIX(ctx), img->name, img->width, img->height, img->originalWidth, img->originalHeight, *srcRect, *destRect, *GET_CLIPPING_BOUNDS(ctx), ctx->globalAlpha[ctx->mvp] * alpha, ctx->globalCompositeOperation[ctx->mvp], &ctx->filter_color, ctx->filter_type);
}
}
/**
* @name context_2d_drawImage
* @brief darws an image to the given context using given options
* @param ctx - (context_2d *) context to draw to
* @param srcTex - (int) deprecated
* @param url - (const char *) name of the texture to draw from
* @param srcRect - (const rect_2d *) source rectangle on the texture to draw from
* @param destRect - (const rect_2d *) destination rect to draw to
* @param composite_op - (int) composite operation to draw with
* @retval NONE
*/
void context_2d_drawImage(context_2d *ctx, int srcTex, const char *url, const rect_2d *srcRect, const rect_2d *destRect) {
context_2d_bind(ctx);
texture_2d *tex = texture_manager_load_texture(texture_manager_get(), url);
if (tex && tex->loaded) {
draw_textures_item(ctx, GET_MODEL_VIEW_MATRIX(ctx), tex->name, tex->width, tex->height, tex->originalWidth, tex->originalHeight, *srcRect, *destRect, * GET_CLIPPING_BOUNDS(ctx), ctx->globalAlpha[ctx->mvp], ctx->globalCompositeOperation[ctx->mvp], &ctx->filter_color, ctx->filter_type);
}
}
/**
* @name context_2d_draw_point_sprites
* @brief Draws pointsprites using the given options (in batch along a line)
* @param ctx - (context_2d *) context to draw to
* @param url - (const char *) name of the texture to draw from
* @param point_size - (float) point sprite size
* @param step_size - (float) step size to take between drawn pointsprites
* @param color - (rgba *) color to draw with
* @param x1 - (float) starting x-coordinate to draw along
* @param y1 - (float) starting y-coordinate to draw along
* @param x2 - (float) ending x-coordinate to draw along
* @param y2 - (float) ending y-coordinate to draw along
* @retval NONE
*/
void context_2d_draw_point_sprites(context_2d *ctx, const char *url, float point_size, float step_size, rgba *color, float x1, float y1, float x2, float y2) {
draw_textures_flush();
context_2d_bind(ctx);
texture_2d *tex = texture_manager_load_texture(texture_manager_get(), url);
// If texture is not finished loading,
if (!tex || !tex->loaded) {
return;
}
static GLfloat *vertex_buffer = NULL;
static unsigned int vertex_max = 64;
tealeaf_shaders_bind(DRAWING_SHADER);
matrix_3x3_multiply_m_f_f_f_f(GET_MODEL_VIEW_MATRIX(ctx), x1, y1, &x1, &y1);
matrix_3x3_multiply_m_f_f_f_f(GET_MODEL_VIEW_MATRIX(ctx), x2, y2, &x2, &y2);
// Allocate vertex array buffer
if (vertex_buffer == NULL) {
vertex_buffer = malloc(vertex_max * 2 * sizeof(GLfloat));
}
// Add points to the buffer so there are drawing points every X pixels
unsigned int count = ceilf(sqrtf((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1)) / step_size);
if (count < 1) {
count = 1;
}
unsigned int vertex_count = 0;
unsigned int i;
for (i = 0; i < count; ++i) {
if (vertex_count == vertex_max) {
vertex_max = 2 * vertex_max;
vertex_buffer = realloc(vertex_buffer, vertex_max * 2 * sizeof(GLfloat));
}
vertex_buffer[2 * vertex_count + 0] = x1 + (x2 - x1) * ((GLfloat)i / (GLfloat)count);
vertex_buffer[2 * vertex_count + 1] = y1 + (y2 - y1) * ((GLfloat)i / (GLfloat)count);
vertex_count += 1;
}
GLTRACE(glActiveTexture(GL_TEXTURE0));
GLTRACE(glBindTexture(GL_TEXTURE_2D, tex->name));
GLTRACE(glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA));
GLTRACE(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
GLTRACE(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
GLTRACE(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));
GLTRACE(glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));
// Render the vertex array
GLTRACE(glUniform1f(global_shaders[DRAWING_SHADER].point_size, point_size));
GLTRACE(glVertexAttribPointer(global_shaders[DRAWING_SHADER].vertex_coords, 2, GL_FLOAT, GL_FALSE, 0, (float *) vertex_buffer));
float alpha = color->a * ctx->globalAlpha[ctx->mvp];
GLTRACE(glUniform4f(global_shaders[DRAWING_SHADER].draw_color, alpha * color->r, alpha * color->g, alpha * color->b, alpha));
GLTRACE(glDrawArrays(GL_POINTS, 0, vertex_count));
tealeaf_shaders_bind(PRIMARY_SHADER);
}
void context_2d_setTransform(context_2d *ctx, double m11, double m12, double m21, double m22, double dx, double dy) {
context_2d_bind(ctx);
matrix_3x3 *m = GET_MODEL_VIEW_MATRIX(ctx);
m->m00 = m11;
m->m01 = m21;
m->m10 = m12;
m->m11 = m22;
m->m02 = dx;
m->m12 = dy;
}
/**
* @name context_2d_clearRect
* @brief clears the given rect on the given context
* @param ctx - (context_2d *) context to clear a rect from
* @param rect - (const rect_2d *) rect to clear from the context
* @retval NONE
*/
void context_2d_clearRect(context_2d *ctx, const rect_2d *rect) {
draw_textures_flush();
context_2d_bind(ctx);
// Draw a rectangle using triangle strip:
// (0,1)-(2,3)-(4,5) and (2,3)-(4,5)-(6,7)
//
// With coordinates:
// 4,5 - 6,7
// | \ |
// 0,1 - 2,3
GLfloat v[8];
matrix_3x3_multiply(GET_MODEL_VIEW_MATRIX(ctx), rect, (float *)&v[4], (float *)&v[5], (float *)&v[6], (float *)&v[7], (float *)&v[2], (float *)&v[3], (float *)&v[0], (float *)&v[1]);
glBlendFunc(GL_ONE, GL_ZERO);
glUniform4f(global_shaders[PRIMARY_SHADER].draw_color, 0, 0, 0, 0); // set color to 0
glVertexAttribPointer(global_shaders[PRIMARY_SHADER].vertex_coords, 2, GL_FLOAT, GL_FALSE, 0, v);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
}
/**
* @name context_2d_fillRect
* @brief fills a rectangle on the given context using given options
* @param ctx - (context_2d *) context to fill a rectangle on
* @param rect - (const rect_2d *) rect to be filled
* @param color - (const rgba *) color to fill with
* @param composite_op - deprecated
* @retval NONE
*/
void context_2d_fillRect(context_2d *ctx, const rect_2d *rect, const rgba *color) {
if (use_single_shader) {
return;
}
draw_textures_flush();
context_2d_bind(ctx);
tealeaf_shaders_bind(FILL_RECT_SHADER);
apply_composite_operation(ctx->globalCompositeOperation[ctx->mvp]);
rect_2d_vertices in, out;
rect_2d_to_rect_2d_vertices(rect, &in);
matrix_3x3_multiply_m_r_r(GET_MODEL_VIEW_MATRIX(ctx), &in, &out);
float alpha = color->a * ctx->globalAlpha[ctx->mvp];
// TODO: will pre-multiplied alpha cause a loss-of-precision in color for filling rectangles?
GLTRACE(glUniform4f(global_shaders[FILL_RECT_SHADER].draw_color, alpha * color->r, alpha * color->g, alpha * color->b, alpha));
GLTRACE(glVertexAttribPointer(global_shaders[FILL_RECT_SHADER].vertex_coords, 2, GL_FLOAT, GL_FALSE, 0, &out));
GLTRACE(glDrawArrays(GL_TRIANGLE_STRIP, 0, 4));
tealeaf_shaders_bind(PRIMARY_SHADER);
}
/**
* @name context_2d_clear
* @brief
* @param ctx - (context_2d *)
* @retval NONE
*/
void context_2d_clear(context_2d *ctx) {
draw_textures_flush();
context_2d_bind(ctx);
glClearColor(0, 0, 0, 0);
glClear(GL_COLOR_BUFFER_BIT);
}
