static void
_cairo_gl_composite_emit_solid_span (cairo_gl_context_t *ctx,
GLfloat x1, GLfloat y1,
GLfloat x2, GLfloat y2,
uint8_t alpha)
{
GLfloat *v;
union fi {
float f;
GLbyte bytes[4];
} fi;
_cairo_gl_composite_prepare_buffer (ctx, 6,
CAIRO_GL_PRIMITIVE_TYPE_TRIANGLES);
v = (GLfloat *) (void *) &ctx->vb[ctx->vb_offset];
v[15] = v[ 6] = v[0] = x1;
v[10] = v[ 4] = v[1] = y1;
v[12] = v[ 9] = v[3] = x2;
v[16] = v[13] = v[7] = y2;
fi.bytes[0] = 0;
fi.bytes[1] = 0;
fi.bytes[2] = 0;
fi.bytes[3] = alpha;
v[17] =v[14] = v[11] = v[8] = v[5] = v[2] = fi.f;
ctx->vb_offset += 6*3 * sizeof(GLfloat);
}
void
_cairo_gl_composite_emit_glyph (cairo_gl_context_t *ctx,
GLfloat x1,
GLfloat y1,
GLfloat x2,
GLfloat y2,
GLfloat glyph_x1,
GLfloat glyph_y1,
GLfloat glyph_x2,
GLfloat glyph_y2)
{
if (ctx->draw_mode != CAIRO_GL_VERTEX) {
_cairo_gl_composite_flush (ctx);
ctx->draw_mode = CAIRO_GL_VERTEX;
}
_cairo_gl_composite_prepare_buffer (ctx, 6,
CAIRO_GL_PRIMITIVE_TYPE_TRIANGLES);
_cairo_gl_composite_emit_glyph_vertex (ctx, x1, y1, glyph_x1, glyph_y1);
_cairo_gl_composite_emit_glyph_vertex (ctx, x2, y1, glyph_x2, glyph_y1);
_cairo_gl_composite_emit_glyph_vertex (ctx, x1, y2, glyph_x1, glyph_y2);
_cairo_gl_composite_emit_glyph_vertex (ctx, x2, y1, glyph_x2, glyph_y1);
_cairo_gl_composite_emit_glyph_vertex (ctx, x2, y2, glyph_x2, glyph_y2);
_cairo_gl_composite_emit_glyph_vertex (ctx, x1, y2, glyph_x1, glyph_y2);
}
static void
_cairo_gl_composite_emit_solid_glyph (cairo_gl_context_t *ctx,
GLfloat x1, GLfloat y1,
GLfloat x2, GLfloat y2,
GLfloat glyph_x1, GLfloat glyph_y1,
GLfloat glyph_x2, GLfloat glyph_y2)
{
GLfloat *v;
_cairo_gl_composite_prepare_buffer (ctx, 6,
CAIRO_GL_PRIMITIVE_TYPE_TRIANGLES);
v = (GLfloat *) (void *) &ctx->vb[ctx->vb_offset];
v[20] = v[ 8] = v[0] = x1;
v[13] = v[ 5] = v[1] = y1;
v[22] = v[10] = v[2] = glyph_x1;
v[15] = v[ 7] = v[3] = glyph_y1;
v[16] = v[12] = v[4] = x2;
v[18] = v[14] = v[6] = glyph_x2;
v[21] = v[17] = v[ 9] = y2;
v[23] = v[19] = v[11] = glyph_y2;
ctx->vb_offset += 4 * 6 * sizeof (GLfloat);
}
cairo_int_status_t
_cairo_gl_composite_emit_triangle_as_tristrip (cairo_gl_context_t *ctx,
cairo_gl_composite_t *setup,
const cairo_point_t triangle[3])
{
_cairo_gl_composite_prepare_buffer (ctx, 3);
_cairo_gl_composite_emit_tristrip_vertex (ctx, &triangle[0]);
_cairo_gl_composite_emit_tristrip_vertex (ctx, &triangle[1]);
_cairo_gl_composite_emit_tristrip_vertex (ctx, &triangle[2]);
return _cairo_gl_composite_append_vertex_indices (ctx, 3);
}
cairo_int_status_t
_cairo_gl_composite_emit_triangle_as_tristrip (cairo_gl_context_t *ctx,
cairo_gl_composite_t *setup,
const cairo_point_t triangle[3])
{
_cairo_gl_composite_prepare_buffer (ctx, 3,
CAIRO_GL_PRIMITIVE_TYPE_TRISTRIPS);
_cairo_gl_composite_emit_point (ctx, &triangle[0], 0);
_cairo_gl_composite_emit_point (ctx, &triangle[1], 0);
_cairo_gl_composite_emit_point (ctx, &triangle[2], 0);
return _cairo_gl_composite_append_vertex_indices (ctx, 3);
}
static void
_cairo_gl_composite_emit_rect (cairo_gl_context_t *ctx,
GLfloat x1, GLfloat y1,
GLfloat x2, GLfloat y2)
{
_cairo_gl_composite_prepare_buffer (ctx, 6,
CAIRO_GL_PRIMITIVE_TYPE_TRIANGLES);
_cairo_gl_composite_emit_vertex (ctx, x1, y1);
_cairo_gl_composite_emit_vertex (ctx, x2, y1);
_cairo_gl_composite_emit_vertex (ctx, x1, y2);
_cairo_gl_composite_emit_vertex (ctx, x2, y1);
_cairo_gl_composite_emit_vertex (ctx, x2, y2);
_cairo_gl_composite_emit_vertex (ctx, x1, y2);
}
cairo_int_status_t
_cairo_gl_composite_emit_point_as_single_line (cairo_gl_context_t *ctx,
const cairo_point_t point[2])
{
int num_indices = 2;
if (ctx->draw_mode != CAIRO_GL_LINES)
_cairo_gl_composite_flush (ctx);
ctx->draw_mode = CAIRO_GL_LINES;
_cairo_gl_composite_prepare_buffer (ctx, 2,
CAIRO_GL_PRIMITIVE_TYPE_TRISTRIPS);
_cairo_gl_composite_emit_point (ctx, &point[0], 0);
_cairo_gl_composite_emit_point (ctx, &point[1], 0);
return _cairo_gl_composite_append_vertex_indices (ctx, num_indices, FALSE);
}
static void
_cairo_gl_composite_emit_span (cairo_gl_context_t *ctx,
GLfloat x1, GLfloat y1,
GLfloat x2, GLfloat y2,
uint8_t alpha)
{
_cairo_gl_composite_prepare_buffer (ctx, 6,
CAIRO_GL_PRIMITIVE_TYPE_TRIANGLES);
_cairo_gl_composite_emit_alpha_vertex (ctx, x1, y1, alpha);
_cairo_gl_composite_emit_alpha_vertex (ctx, x2, y1, alpha);
_cairo_gl_composite_emit_alpha_vertex (ctx, x1, y2, alpha);
_cairo_gl_composite_emit_alpha_vertex (ctx, x2, y1, alpha);
_cairo_gl_composite_emit_alpha_vertex (ctx, x2, y2, alpha);
_cairo_gl_composite_emit_alpha_vertex (ctx, x1, y2, alpha);
}
cairo_int_status_t
_cairo_gl_composite_emit_quad_as_tristrip (cairo_gl_context_t *ctx,
cairo_gl_composite_t *setup,
const cairo_point_t quad[4])
{
_cairo_gl_composite_prepare_buffer (ctx, 4);
_cairo_gl_composite_emit_tristrip_vertex (ctx, &quad[0]);
_cairo_gl_composite_emit_tristrip_vertex (ctx, &quad[1]);
/* Cairo stores quad vertices in counter-clockwise order, but we need to
emit them from top to bottom in the triangle strip, so we need to reverse
the order of the last two vertices. */
_cairo_gl_composite_emit_tristrip_vertex (ctx, &quad[3]);
_cairo_gl_composite_emit_tristrip_vertex (ctx, &quad[2]);
return _cairo_gl_composite_append_vertex_indices (ctx, 4);
}
void
_cairo_gl_composite_emit_rect (cairo_gl_context_t *ctx,
GLfloat x1,
GLfloat y1,
GLfloat x2,
GLfloat y2,
uint8_t alpha)
{
_cairo_gl_composite_prepare_buffer (ctx, 6);
_cairo_gl_composite_emit_vertex (ctx, x1, y1, alpha);
_cairo_gl_composite_emit_vertex (ctx, x2, y1, alpha);
_cairo_gl_composite_emit_vertex (ctx, x1, y2, alpha);
_cairo_gl_composite_emit_vertex (ctx, x2, y1, alpha);
_cairo_gl_composite_emit_vertex (ctx, x2, y2, alpha);
_cairo_gl_composite_emit_vertex (ctx, x1, y2, alpha);
}
cairo_int_status_t
_cairo_gl_composite_emit_triangle_as_tristrip (cairo_gl_context_t *ctx,
cairo_gl_composite_t *setup,
const cairo_point_t triangle[3])
{
if (ctx->draw_mode != CAIRO_GL_VERTEX) {
_cairo_gl_composite_flush (ctx);
ctx->draw_mode = CAIRO_GL_VERTEX;
}
_cairo_gl_composite_prepare_buffer (ctx, 3,
CAIRO_GL_PRIMITIVE_TYPE_TRISTRIPS);
_cairo_gl_composite_emit_point (ctx, &triangle[0], 0);
_cairo_gl_composite_emit_point (ctx, &triangle[1], 0);
_cairo_gl_composite_emit_point (ctx, &triangle[2], 0);
return _cairo_gl_composite_append_vertex_indices (ctx, 3, TRUE);
}
void
_cairo_gl_composite_emit_glyph (cairo_gl_context_t *ctx,
GLfloat x1,
GLfloat y1,
GLfloat x2,
GLfloat y2,
GLfloat glyph_x1,
GLfloat glyph_y1,
GLfloat glyph_x2,
GLfloat glyph_y2)
{
_cairo_gl_composite_prepare_buffer (ctx, 6);
_cairo_gl_composite_emit_glyph_vertex (ctx, x1, y1, glyph_x1, glyph_y1);
_cairo_gl_composite_emit_glyph_vertex (ctx, x2, y1, glyph_x2, glyph_y1);
_cairo_gl_composite_emit_glyph_vertex (ctx, x1, y2, glyph_x1, glyph_y2);
_cairo_gl_composite_emit_glyph_vertex (ctx, x2, y1, glyph_x2, glyph_y1);
_cairo_gl_composite_emit_glyph_vertex (ctx, x2, y2, glyph_x2, glyph_y2);
_cairo_gl_composite_emit_glyph_vertex (ctx, x1, y2, glyph_x1, glyph_y2);
}
cairo_int_status_t
_cairo_gl_composite_emit_quad_as_tristrip (cairo_gl_context_t *ctx,
cairo_gl_composite_t *setup,
const cairo_point_t quad[4])
{
if (ctx->draw_mode != CAIRO_GL_VERTEX) {
_cairo_gl_composite_flush (ctx);
ctx->draw_mode = CAIRO_GL_VERTEX;
}
_cairo_gl_composite_prepare_buffer (ctx, 4,
CAIRO_GL_PRIMITIVE_TYPE_TRISTRIPS);
_cairo_gl_composite_emit_point (ctx, &quad[0], 0);
_cairo_gl_composite_emit_point (ctx, &quad[1], 0);
/* Cairo stores quad vertices in counter-clockwise order, but we need to
emit them from top to bottom in the triangle strip, so we need to reverse
the order of the last two vertices. */
_cairo_gl_composite_emit_point (ctx, &quad[3], 0);
_cairo_gl_composite_emit_point (ctx, &quad[2], 0);
return _cairo_gl_composite_append_vertex_indices (ctx, 4, TRUE);
}
void
_cairo_gl_composite_emit_rect (cairo_gl_context_t *ctx,
GLfloat x1,
GLfloat y1,
GLfloat x2,
GLfloat y2,
uint8_t alpha)
{
if (ctx->draw_mode != CAIRO_GL_VERTEX) {
_cairo_gl_composite_flush (ctx);
ctx->draw_mode = CAIRO_GL_VERTEX;
}
_cairo_gl_composite_prepare_buffer (ctx, 6,
CAIRO_GL_PRIMITIVE_TYPE_TRIANGLES);
_cairo_gl_composite_emit_vertex (ctx, x1, y1, alpha);
_cairo_gl_composite_emit_vertex (ctx, x2, y1, alpha);
_cairo_gl_composite_emit_vertex (ctx, x1, y2, alpha);
_cairo_gl_composite_emit_vertex (ctx, x2, y1, alpha);
_cairo_gl_composite_emit_vertex (ctx, x2, y2, alpha);
_cairo_gl_composite_emit_vertex (ctx, x1, y2, alpha);
}
