fbo-readdrawpix: a varient of fbo-blit.c

1 files changed, 229 insertions, 0 deletions

diff --git a/tests/fbo/fbo-readdrawpix.c b/tests/fbo/fbo-readdrawpix.c
new file mode 100644
index 000000000..262c73c5f
--- /dev/null
+++ b/tests/fbo/fbo-readdrawpix.c
@@ -0,0 +1,229 @@
+/*
+ * Copyright © 2010 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Eric Anholt <eric@anholt.net>
+ *    Brian Paul
+ */
+
+/** @file fbo-readdrawpix.c
+ *
+ * Test glReadPixels / glDrawPixels between FBO and window.
+ * See also fbo-blit.c and fbo-copypix.c
+ */
+
+#include "piglit-util.h"
+
+int piglit_width = 150;
+int piglit_height = 150;
+int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
+#define PAD 10
+#define SIZE 20
+
+/* size of texture/renderbuffer (power of two) */
+#define FBO_SIZE 64
+
+
+static GLuint
+make_fbo(int w, int h)
+{
+	GLuint tex;
+	GLuint fb;
+ 	GLenum status;
+
+	glGenFramebuffersEXT(1, &fb);
+	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
+
+	glGenTextures(1, &tex);
+	glBindTexture(GL_TEXTURE_2D, tex);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
+		     w, h, 0,
+		     GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+	glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
+				  GL_COLOR_ATTACHMENT0_EXT,
+				  GL_TEXTURE_2D,
+				  tex,
+				  0);
+	assert(glGetError() == 0);
+
+	status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
+	if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+		fprintf(stderr, "fbo incomplete (status = 0x%04x)\n", status);
+		piglit_report_result(PIGLIT_SKIP);
+	}
+
+	return fb;
+}
+
+static void
+draw_color_rect(int x, int y, int w, int h)
+{
+	int x1 = x;
+	int x2 = x + w / 2;
+	int y1 = y;
+	int y2 = y + h / 2;
+
+	glColor4f(1.0, 0.0, 0.0, 0.0);
+	piglit_draw_rect(x1, y1, w / 2, h / 2);
+	glColor4f(0.0, 1.0, 0.0, 0.0);
+	piglit_draw_rect(x2, y1, w / 2, h / 2);
+	glColor4f(0.0, 0.0, 1.0, 0.0);
+	piglit_draw_rect(x1, y2, w / 2, h / 2);
+	glColor4f(1.0, 1.0, 1.0, 0.0);
+	piglit_draw_rect(x2, y2, w / 2, h / 2);
+}
+
+static GLboolean
+verify_color_rect(int start_x, int start_y, int w, int h)
+{
+	float red[] =   {1, 0, 0, 0};
+	float green[] = {0, 1, 0, 0};
+	float blue[] =  {0, 0, 1, 0};
+	float white[] = {1, 1, 1, 0};
+	int x, y;
+
+	for (y = 0; y < h; y++) {
+		for (x = 0; x < w; x++) {
+			float *expected;
+
+			if ((y < h / 2) && (x < w / 2))
+				expected = red;
+			else if (y < h / 2)
+				expected = green;
+			else if (x < w / 2)
+				expected = blue;
+			else
+				expected = white;
+
+			if (!piglit_probe_pixel_rgb(start_x + x, start_y + y,
+						    expected))
+				return GL_FALSE;
+		}
+	}
+
+	return GL_TRUE;
+}
+
+
+static void
+copy(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
+     GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1)
+{
+	GLsizei srcW = srcX1 - srcX0, srcH = srcY1 - srcY0;
+	GLsizei dstW = dstX1 - dstX0, dstH = dstY1 - dstY0;
+	void *buf = malloc(srcW * srcH * 4);
+	glReadPixels(srcX0, srcY0, srcW, srcH,
+		     GL_RGBA, GL_UNSIGNED_BYTE, buf);
+	glPixelZoom((float) dstW / (float) srcW,
+		    (float) dstH / (float) srcH);
+	glWindowPos2i(dstX0, dstY0);
+	glDrawPixels(srcW, srcH, GL_RGBA, GL_UNSIGNED_BYTE, buf);
+	free(buf);
+}
+
+
+static GLboolean
+run_test(void)
+{
+	GLboolean pass = GL_TRUE;
+	GLuint fbo;
+	int fbo_width = FBO_SIZE;
+	int fbo_height = FBO_SIZE;
+	int x0 = PAD;
+	int y0 = PAD;
+	int y1 = PAD * 2 + SIZE;
+	int y2 = PAD * 3 + SIZE * 2;
+
+	glViewport(0, 0, piglit_width, piglit_height);
+	piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
+
+	glClearColor(0.5, 0.5, 0.5, 0.5);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	/* Draw the color rect in the window system window */
+	draw_color_rect(x0, y0, SIZE, SIZE);
+
+	fbo = make_fbo(fbo_width, fbo_height);
+
+	glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER_EXT, fbo);
+	glBindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, 0);
+	glViewport(0, 0, fbo_width, fbo_height);
+	piglit_ortho_projection(fbo_width, fbo_height, GL_FALSE);
+	glClearColor(1.0, 0.0, 1.0, 0.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	/* Draw the color rect in the FBO */
+	draw_color_rect(x0, y0, SIZE, SIZE);
+
+	/* Now that we have correct samples, blit things around.
+	 * FBO(bottom) -> WIN(middle)
+	 */
+	glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER_EXT, 0);
+	glBindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, fbo);
+ 	copy(x0, y0, x0 + SIZE, y0 + SIZE,
+ 	     x0, y1, x0 + SIZE, y1 + SIZE);
+
+	/* WIN(bottom) -> FBO(middle) */
+	glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER_EXT, fbo);
+	glBindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, 0);
+ 	copy(x0, y0, x0 + SIZE, y0 + SIZE,
+ 	     x0, y1, x0 + SIZE, y1 + SIZE);
+
+	/* FBO(middle) -> WIN(top) back to verify WIN -> FBO */
+	glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER_EXT, 0);
+	glBindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, fbo);
+ 	copy(x0, y1, x0 + SIZE, y1 + SIZE,
+ 	     x0, y2, x0 + SIZE, y2 + SIZE);
+
+	glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER_EXT, 0);
+	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+
+	pass = verify_color_rect(PAD, y0, SIZE, SIZE) && pass;
+	pass = verify_color_rect(PAD, y1, SIZE, SIZE) && pass;
+	pass = verify_color_rect(PAD, y2, SIZE, SIZE) && pass;
+
+	glutSwapBuffers();
+
+	return pass;
+}
+
+
+enum piglit_result
+piglit_display(void)
+{
+	GLboolean pass = run_test();
+
+	return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
+}
+
+
+void
+piglit_init(int argc, char **argv)
+{
+	piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
+
+	piglit_require_extension("GL_EXT_framebuffer_object");
+}