aboutsummaryrefslogtreecommitdiff
path: root/subprojects/d2tk/pugl/pugl/cairo_gl.h
diff options
context:
space:
mode:
Diffstat (limited to 'subprojects/d2tk/pugl/pugl/cairo_gl.h')
-rw-r--r--subprojects/d2tk/pugl/pugl/cairo_gl.h106
1 files changed, 106 insertions, 0 deletions
diff --git a/subprojects/d2tk/pugl/pugl/cairo_gl.h b/subprojects/d2tk/pugl/pugl/cairo_gl.h
new file mode 100644
index 0000000..fb4cb2a
--- /dev/null
+++ b/subprojects/d2tk/pugl/pugl/cairo_gl.h
@@ -0,0 +1,106 @@
+/*
+ Copyright 2016 David Robillard <http://drobilla.net>
+
+ Permission to use, copy, modify, and/or distribute this software for any
+ purpose with or without fee is hereby granted, provided that the above
+ copyright notice and this permission notice appear in all copies.
+
+ THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#if defined(PUGL_HAVE_GL) && defined(PUGL_HAVE_CAIRO)
+
+#include <cairo/cairo.h>
+#include <stdint.h>
+
+#include "pugl/gl.h"
+
+typedef struct {
+ unsigned texture_id;
+ uint8_t* buffer;
+} PuglCairoGL;
+
+static cairo_surface_t*
+pugl_cairo_gl_create(PuglCairoGL* ctx, int width, int height, int bpp)
+{
+ free(ctx->buffer);
+ ctx->buffer = (uint8_t*)calloc(bpp * width * height, sizeof(uint8_t));
+ if (!ctx->buffer) {
+ fprintf(stderr, "failed to allocate surface buffer\n");
+ return NULL;
+ }
+
+ return cairo_image_surface_create_for_data(
+ ctx->buffer, CAIRO_FORMAT_ARGB32, width, height, bpp * width);
+}
+
+static void
+pugl_cairo_gl_free(PuglCairoGL* ctx)
+{
+ free(ctx->buffer);
+ ctx->buffer = NULL;
+}
+
+static void
+pugl_cairo_gl_configure(PuglCairoGL* ctx,
+ int width __attribute__((unused)), int height __attribute__((unused)))
+{
+ glDisable(GL_DEPTH_TEST);
+ glEnable(GL_BLEND);
+ glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+ glEnable(GL_TEXTURE_RECTANGLE_ARB);
+
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glOrtho(-1.0f, 1.0f, -1.0f, 1.0f, -1.0f, 1.0f);
+
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ glDeleteTextures(1, &ctx->texture_id);
+ glGenTextures(1, &ctx->texture_id);
+ glBindTexture(GL_TEXTURE_RECTANGLE_ARB, ctx->texture_id);
+ glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
+}
+
+static void
+pugl_cairo_gl_draw(PuglCairoGL* ctx, int width, int height)
+{
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+ glViewport(0, 0, width, height);
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ glPushMatrix();
+ glEnable(GL_TEXTURE_RECTANGLE_ARB);
+ glEnable(GL_TEXTURE_2D);
+
+ glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA8,
+ width, height, 0,
+ GL_BGRA, GL_UNSIGNED_BYTE, ctx->buffer);
+
+ glBegin(GL_QUADS);
+ glTexCoord2f(0.0f, (GLfloat)height);
+ glVertex2f(-1.0f, -1.0f);
+
+ glTexCoord2f((GLfloat)width, (GLfloat)height);
+ glVertex2f(1.0f, -1.0f);
+
+ glTexCoord2f((GLfloat)width, 0.0f);
+ glVertex2f(1.0f, 1.0f);
+
+ glTexCoord2f(0.0f, 0.0f);
+ glVertex2f(-1.0f, 1.0f);
+ glEnd();
+
+ glDisable(GL_TEXTURE_2D);
+ glDisable(GL_TEXTURE_RECTANGLE_ARB);
+ glPopMatrix();
+}
+
+#endif